H12 and H12R Mini Excavator Manual and Parts List

H12 MINI CRAWLER EXCAVATOR

OPERATION & MAINTENANCE MANUAL

Preface

Chapter I Usage Features and Performance Parameters of H12 Excavators

Section I Usage and features

Section II Main performance parameters

Chapter II Basic Structures and Work principle of H12 Excavators

Section I Overview

Section II Work principle

Section III Basic structure of mechanical system

Section IV Basic structure of hydraulic system

Chapter III Service Technologies of H12 Excavators

Section I Basic construction knowledge

Section II Preparation for work

Section III Operational essentials

Section IV Operational precautions

Chapter VI Maintenance of H12 Excavators

Section I Daily inspection

Section II Periods of overhaul, medium and minor repair

Chapter VII Troubleshooting of H12 Excavator

Section I General

Section II Troubleshooting of mechanical system

Section III Troubleshooting of hydraulic system

Section IV Troubleshooting of electrical controlsystem

Section V Troubleshooting of engine

Section VI Other

Attachment: BOM List of H12 Parts

As product improvements, technical data and parameters is likely to change.

Chapter I Usage Features and Performance Parameters of H12

Excavators

Section I Usage and features

H12 Excavators are provided with excavating, crushing, ditch cleaning, drilling and bulldozing, with

their attachments quick hitched and thus its utilization up greatly. In addition, they are easy to operate and

transport and flexible to work at narrow site.

H12 Excavators, hydraulic type with single bucket

This type of excavators are mainly applied to: farming, landscaping, ditching and fertilization in garden, vegetable

greenhouse, agricultural transformation, indoor demolition, small earthwork, civil engineering, road recovery,

basement and indoor construction, concrete breaking, burying of cable, laying of water supply line, garden

cultivation, desilting and others.

The excavator are equipped with KOOP/KUBOTA/CHANGCHAI Diesel Engine or BRIGGS & STRATTON Gasoline

Engine.

Excavators are able to equipped with multiple work equipment, such as quick hitch, log grapple, ripper, leveling

bucket, auger and narrow bucket, as well as optional roof, radiator and others, so as to meet your needing.

Quick hitch

Narrow bucket

Log grapple

Mechanical thumb

Auger

Ripper

Rake

Section II Main performance parameters

Overall dimensions

A Wheel track

Unit: mm

895

B Overall length of track

C Ground clearance of platform

D Ground clearance of platform tail

E Chassis width

1203

357

800

930

F Crawler width

180

H Crawler height

313

I Transportation length

J Overall height

2775

2219

Work range

A Max. digging radius on ground

B Max. digging depth

Unit: mm

2850

1650

C Max. digging height

2600

D Max. unloading height

E Max. vertical digging depth

F Min. swing radius

1800

1380

1300

G Max. lifting height of dozer blade

H Max. digging depth of dozer blade

110

Performanceparameters

Weight of complete machine kg

Standard bucket capacity m³

950

0.025

Rated power kw

Refer to Engine Label

Chapter II Basic Structures and Work Principle of H12 Excavators

Section I Overview on H12 excavators

H12 excavator is composed of power train, work equipment, swing mechanism, control mechanism, drive

system, traveling mechanism and auxiliary equipment, as shown in fig. 1-1. Mounted on the rotary table are the

regular full-swing type hydraulic excavators, main components of drive system, swing mechanism and auxiliary

devices, which are referred to as upper rotary. Therefore, a H12 excavator is divided into work equipment,

upper rotary and traveling mechanism.

Section II Work principle of excavators

Diesel engine changes the chemical energy of diesel into mechanical energy that is then altered with hydraulic

gear pump to hydraulic energy that is distributed to each actuating element (such as hydraulic cylinder, swing

motor and traveling motor). After that, each actuating element transform the hydraulic energy back to mechanical

energy, driving the work equipment and running the complete machine.

Central

slewing joint

Movement and power transmission route of excavator shown below:

Traveling power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to

hydraulic energy) —— distributor valve —— central swing joint —— traveling motor (hydraulic energy

changed to mechanical energy)—— sprocket —— rubber crawler—— starting of traveling

Swing power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to

hydraulic energy) —— distributor valve—— swing motor (hydraulic energy changed to mechanical energy)

—

— slewing bearing —— realizing of wing

Boom power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to

hydraulic energy) —— distributor valve —— boom cylinder (hydraulic energy changed to mechanical

energy)——boom movement

Arm power route: diesel engine —— coupler —— hydraulic pump (mechanical energy changed to hydraulic

energy) —— distributor valve —— arm cylinder (hydraulic energy changed to mechanical energy) —— arm

movement

Bucket power route: diesel engine ——coupler —— hydraulic pump (mechanical energy changed to

hydraulic energy) —— distributor valve —— bucket cylinder (hydraulic energy changed to mechanical

energy) —— bucket movement

Section III Basic structure of H12 excavators mechanical system

Power system

H12 excavator is equipped with single-cylinder air-cooling diesel/gasoline engine, include KOOP/CHANGCHAI or

BRIGGS & STRATTON Engine. The KUBOTA engine is three-cylinder water-cooling engine, which is made by Japan.

Drive system

H12 excavator's drive system could transfer the output power from engine through the hydraulic system to work

equipment, swing mechanism and traveling mechanism.

Swing mechanism

Swing mechanism could turn the work equipment and upper rotary leftwards and rightwards, so as to do the

excavating and the unloading. H12 excavator's swing mechanism has to fix the rotary table onto frame and

has it swing flexibly, without any inclining risk. Therefore, H12 excavator is equipped with a slewing

support (supports) and a slewing drive (power of turntable slewing), which are called by a joint name as

swing mechanism.

3.1 Slewing support

H12 excavator has its rotary table supported with a rolling bearing, realizing the swinging of upper rotary.

.2 Rotary drive

H12 excavator adopts the direct drive type. Namely, the output shaft of low-speed high-torque hydraulic

motor is mounted with a driving pinion which meshes with the slewing gear ring.

Traveling mechanism

Traveling mechanism supports the complete weight of excavator and drives it to run.

H12 excavator has the crawler traveling mechanism similar to other crawlers, with one hydraulic motor drives one

track. This excavator adopts low-speed high-torque motor. When two hydraulic motors run in the same direction,

this machine goes straightly forward; when one motor is supplied with oil and the other is braked, excavator steers

around the braked track; when two motors runs reversely, excavator rotates as circle.

Each part of traveling mechanism is mounted on integral traveling frame. The pressure oil from hydraulic pump

goes through the multi-way directional valve and the central swing joint into the hydraulic traveling motor that

changes the pressure energy into output torque that then goes to sprocket, driving excavator to run.

H12 excavator’s sprockets are integral castings and able to correctly engage with track, featuring balance drive.

Sprockets located at rear part of excavator, shortening the tensioner part and relieving the track abrasion, wear

and power consumption. Each track is equipped with a tensioner, adjusting the tracking tension and reducing

the track vibration noise, abrasion, wear and power loss.

Work equipment

The hydraulic excavator could install multiple working equipment, 200mm bucket and ripper are most popular.

The boom, arm and bucket are articulated with each other, as shown in figure and swing around their articulated points

respectively with aid of the hydraulic cylinder, to finish the excavating,lifting and unloading.

5.1 Boom

As the main component of backhoe work equipment, the integrated skewed boom is adopted on H12

excavator.

Being of the most popular type at present, skewed boom could allow excavator to dip deeper and to lower the

unloading depth, satisfying the backhoe requirements.

5.2 Bucket

5.2.1 Basic requirements

)

The longitudinal profile of bucket meets the law of motion of various materials at inside of bucket,

facilitating the material flow and minimizing the loading resistance and thus fulfilling thebucket.

Bucket teeth are mounted to increase the linear specific pressure of bucket onto material, with unit

cutting resistance relatively low and easing to cut in and break soil. In addition, the teeth are

resistant to wear and easy to replace.

The load is easy to get off, shortening the unloading time and increasing the effective capacity of

bucket.

5.2.2 Structure

Bucket shape and size for backhoe are highly related to work objects. In order to meet various excavation,

one excavator could be equipped with multiple types of buckets.

Connection between bucket and hydraulic cylinder is of linkage mechanism, with bucket directly

articulated with hydraulic cylinder, which drops the rotation angle of bucket but enables the working

torque to change greatly.

Hydraulic system structure of H12 excavators I. Rotary motor

II. Main pump

Driven gear

Traveling motor

Disc Valve Motors--- BM series -005 and -006

Section IV Schematics of main valve

Section V. Electrical system diagram

Chapter III Service Technologies of H12 Excavators

Being of high temperature and pressure, the hydraulic oil temperature of H12 excavator can high to 85℃,

the engine silencer temperature can high to 700℃ and pressure can high to 16-18Mpa. Therefore,

the operators should be specially trained to obtain the proper certificates and to be familiar with the contents in

this manual before the operations. In addition, maintenance and repair of excavator should be strictly in line with

regulations to avoid any accident.

Section I Basic construction knowledge

There are four basic movements: bucket rotation, arm stretching / backing, boom lifting / lowering and turntable

swinging.

In general, pulling/pushing of hydraulic cylinder and rotation of hydraulic motor is controlled with three-way

axial slide valve through the oil-flow direction and the work speed is controlled by operator or auxiliary devices

according to the quantitative system and the valve openness.

1.1 Basic requirements on control system

Basic requirements on control systeminclude:

Control system should be centralized in the driving area of upper rotary and satisfy the man-machine

requirements. For example, controllers and driver seat should be designed according to 160-180 cm for

males and 150-170 cm for females.

Startup and stop should be steady, with its speed and strength in control. At the same time, the combine

actions should be also in control.

Easy, handy and visual operations In general, the operational force on handle does not exceed 40～60 N

and handle travel does not exceed 17cm.

Control mechanism should minimize the deformation of its lever, as well as the inside clearance and the

idle travel.

Ensure the operational performance does not change in -40～50℃.

Section II Preparation for work

Inspection before startup

In order to prolong its service span, check the following before startup:

①

②

. Check if there is dirt around or below machine, bolts loosened, any oil leaked and if any part damaged or

worn.

. Check if all switches, lamps and fuse box could work normally.

③

. Check if the work equipment and hydraulic parts could work normally.

④

. Check if all engine oil levels and fuel level are proper.

The above should be checked normal; otherwise engine cannot be started up until they are checked normal after

troubleshooting.

Maintenance before startup

Before startup each shift, it is needed to grease the work equipment and the slewing bearing.

Preheating of machine on cold days

If it is cold, engine is difficult to start up, fuel may be frozen and hydraulic oil may increase its viscosity. Therefore,

selection of fuel should be dependent on environment temperature.

When hydraulic oil is less than 25℃, it is needed to preheat the machine before any work; otherwise

machine may not respond or react very quickly, leading to severe accident.

Therefore it is needed to preheat machine if it is cold:

①

. Adjust the manual accelerator to have engine run at medium speed, and then slowly move bucket forth and

back for 5min.

Caution: do not operate other actuators than the bucket.

②

. Adjust the manual accelerator to have engine run at high speed, and then move the boom, the arm and the

bucket for 5-10min.

Caution: operations are merely limited on boom, arm and bucket, instead of any slewing or traveling.

③

. Each complete action of excavator should be carried out for few times, completing the preheating and ready

to work.

Section III Operational essentials

Traveling

Use the traveling handles.

1) Straight

Forwards or backward move the handle, running the machine forwards or backwards.

2) Steering

(

A. Left turn in situ: backward shift the left handle and meanwhile forward push the right handle.

b. Right turn in situ: backward shift right handle and meanwhile forward push the left handle.

c. Left turn with left track as axis: forward move the right handle

d. Right turn with right track as axis: forward move the left handle

Excavation

2.1 The excavator slewing and the work equipment are respectively controlled with two handles, withpositions

shown below:

Forward

Right travel

Dozer shovel

Left travel

Back

2.2 Basic excavation

Before excavation, the arm cylinder should have angle with the arm as 90°, bucket with ground to be

excavated as 30°. Only in such case, can each cylinder have the max excavating force. It is suitable for

relatively hard soil, so as to decrease the excavating resistance.

To excavate any soft soil, bucket should be angled with the soil to be 60°, increasing the work efficiency.

.3 Lower excavation

Keep the angle between bucket base and the bevel at 30°, and retract the arm to start work.

.4 Upper excavation

Keep the bucket blade vertical to the ground, and retract the arm to start work.

.5 Ditching is carried out in 7 steps, as shown in figure.

Section IV Operational Precautions

Prohibitions and precautions for hydraulic excavators

Avoid the landsliding and the stone falling.

Avoid any striking of work equipment.

Avoid the bucket from colliding with other vehicle body, Avoid loaded bucket crossing over other vehicle cab

or persons.

Avoid the excavator from sinking into soft ground or wetland.

In traveling, avoid any large obstacles such as large stone.

It is prohibited to work with water depth exceeding the allowable limit.

While unloaded or loaded, the large stones should be handled carefully.

On cold days, park the machine on solid ground to avoid the track being frozen. Remove any scrap away

from track and its frame. If track is iced onto ground, use boom to lift track and carefully move the machine,

so as not to damage the sprocket and the track.

Before movement of machine, make sure the traveling direction is consistent with its handle. When traveling

motor is at rear part, forward push the traveling handle, to drive machine forwards.

10. For long - distance traveling, please rest for 5min at every 20min running, so as not to damage the traveling

motor.

1. Never try to cross over slope of more than 15 degree, so as to avoid the machine fromoverturning.

2. Avoid to occur any accidents during machine reversing or slewing.

3. In work, do not completely dig the soil from out of bottom of machine.

4. Avoid any collapse: never run on high dam or slope, which may let the machine collapsed or sliding away,

leading to severe accident.

15. Be careful for underground facilities: unexpected cutoff the underground cables or gas pipe may lead to

explosion, fire or even personal casualty.

6. Be careful for overhead facilities such as bridge: if work equipment or other parts collides with over-bridge or

others, it may result in personal injury; care must be taken to prevent the boom or the arm from colliding

with any elevated item.

7. Keep safe distance from overhead power line: in work around power line, let the part of machine or any load

move away from 3m distance of the power insulation. Verify and abide by the local related laws and rules.

Wetland may have the range of electric shock enlarged. Therefore, the irrelative person should be kept away

from work area.

Chapter VI Maintenance of H12 Excavators

Section I Daily inspection and maintenance

Interval (h)

S/N

Item

Quantity

Remark

Check the engine oil level in sump

Check the hydraulic oil level in hydraulic oil tank

Check the fuel level in tank

★

Check the oil-water separator to completely drain

any water or sediment out.

Check if the fuel pipe is leaked or cracked.

Check if the fuel pipe is cracked or bent.

Check the work equipment pivots

----

★

Check if the hydraulic hose and the pipeline leak

Check if the bucket teeth is worn or loosened.

Check the seat belt

★

●

★

Check the bolts and nuts for tightening torque

----

aperiodically

Note: ★: Maintenance interval under normal conditions

: Maintenance needed at the first inspection

: Initial 100h

●

◆

Section II Periods of overhaul, medium and minor repair

Interval (h)

Quantity

S/N

Item

Remark

00 250 500 1000 1500 2000 2500 4000

Greasing of slewing

bearing

★

Greasing of slewing

bearing gears

★

Change the engine oil

●

▲

★

Change the hydraulic

oil

△

★

△

Change the hydraulic

oil suction filter

elements

★

Check if the fuel pipe

is cracked or bent

★

Change the oil-water

separator

★

Check the fuel hose

for leakage / crack

★

Check the fuel hose

for crack / leakage

Change the bucket

Connection of bucket

Remove the traveling

handle

Replace the seat belt

Check the defection of

track

★

Maintenance of

tensioner

★

Note: ★: Maintenance interval under normal conditions

▲

△

☆

: Maintenance interval of engine oil

: Change interval of hydraulic oil is dependent on the work oil type.

: Under the dusty environment, shorten the maintenance interval.

Technical maintenance

A Grease

Interval (h)

250

Parts

Quantity

100

500

1000

2000

Pivot at base of boom

cylinder

. Lubrication

★

of work

equipment

pins

Pivots of bucket and

connecting rod

Others:

. Lubrication of slewing bearing

★

. Lubrication of external meshing

gear of slewing bearing

★

Note: it is recommended to use the lithium grease.

Maintenance interval under normal conditions

★

Maintenance and lubrication of work equipment pivots

●

Pivot between bucket and connecting rod

●

Pivot at base of boom

●

Pivot at base of boom cylinder

●

Others

Pivot between boom and arm; pivot of arm cylinder plunger; pivot at

base of bucket cylinder.

Slewing bearing - every 250h

Park machine on the flat ground.

Lower the bucket onto ground.

Idle engine at low speed for 5min.

Turn the ignition switch to OFF and then take off the key.

With the upper-structure standing still, add the grease into the two grease

nipples.

Start up engine to lift the bucket free from the ground, and then swing the

upper-structure by 45 degree(1/8 cycle).

Lower the bucket onto ground.

. External meshing gear 45 ofslewing bearing----- every 500h

Lower the bucket onto the ground

Turn off the engine.

Park machine on the flat ground.

Lower the bucket onto ground.

Idle engine at low speed for 5min.

Turn the ignition switch to OFF and then take off the key.

The grease has to be stored on the top of external meshing gear of slewing bearing, free of anypollution.

Add approximate 0.5kg of grease if needed.

Any polluted grease should be replaced with new one.

B. Engine oil

Interval (h)

Parts

Quantity

100

●

250

▲

500

★

1000

2000

Engine oil

Engine oil filter

●

▲

★

According to the temperature range during the interval, select the viscosity of oil listed in the table below:

Recommended engine oil brand: 15W—40 engine oil

Inspection of engine oil level ―――each day

Change of engine oil ―――every 500 h

Change the engine oil filter ―――every 500 h

Start up engine to preheat up engine oil properly.

Park the vehicle on the flat ground.

Lower the bucket onto theground.

Idle engine at low speed for5min.

Turn the ignition switch to OFF and then take off the key.

Take off the drain plug to have oil pass through clean cloth into the 2Lcontainer.

After that, check if there is metal scrap or others left on cloth.

Put the drain plug back on and tighten it

Loosen the drain plug to have oil flow through the filter cylinder into a container.

0. Take off the screws fixing the engine oil filter elements with a screwdriver to take the filter elementout.

1. Reinstall the new filter and tighten the screws fixing the new element with a screwdriver.

2. Remove the oil filter cap to add the recommended oil into engine. After 15 min, check if the oil level is

between the circle markers.

3. Put the oil filler cap back on.

4. Shut down engine Unplug the ignition key.

5. Check if the drain plug is leaking.

6. Check the oil level on dipstick.

Caution: keep your body and face away from the breather. When gear oil is still hot, please wait until

it cools down and then slowly release the breather pressure!

C. Hydraulic system

Interval (h)

Parts

Quantity

100

250

500

1000 1500 2500 4000

Check the hydraulic oil level

★

Clean the drain pipe of

hydraulic oil reservoir

★

Change the hydraulic oil

16.5L

★

Change the hydraulic oil

suction filter elements

★

Check the

hose and

pipeline

★

Change the hose

★

Note: ★ normal maintenance interval

Inspection and maintenance of hydraulic system

Caution: in work, the hydraulic system may become very hot. Please cool the machine down before

inspection or maintenance!

Before maintenance of hydraulic system, make sure the machine stands on flat and solidground.

Lower the bucket onto ground and shut down engine.

Do not start any maintenance until the hydraulic oil and lubricant completely cool down, as the hydraulic

system may be still hot and pressurized as soon as work is over.

a. Drain the air out of hydraulic oil reservoir to release inside pressure.

b. Cool the machine down.

Caution: inspection and maintenance of hot and pressure parts may cause them or hydraulic oil to

spray out, leading to personal injury!

c. While removing the bolts or nuts, do not have your body facing them, as the hydraulic parts, evenif

they cools down, they may still have pressure..

d. Never try to check the traveling or slewing motor circuits on slope, as they may have pressure dueto

their dead weight.

While connecting the hydraulic hoses and pipeline, keep the seal surface free of any dirt and damage. Keep

the above mentioned in mind:

a. Clean the hose, the pipeline and inside of hydraulic oil tank with detergent, and then thoroughlydry

them.

b. Use the O-ring free of any damage or defect.

c. While connecting the pressure hose, do not twist it; otherwise its service span will be shortened. .

d. Carefully tighten the low-pressure hose clamp.

The hydraulic oil to be added should have the same grade. Namely, do not mix the oil with different grades.

The hydraulic oil has been added before delivery, and therefore, please use the recommended oil. All oil in

system should be changed at once.

With no hydraulic oil, never start up engine.

I. Inspection of hydraulic oil level --- each day

Important: With no hydraulic oil, never start up engine!

Park machine on the flat ground.

Completely retract the arm cylinder and extend out the bucket cylinder, so as to locate themachine.

Lower the bucket onto theground.

Idle engine at low speed for5min.

Shut down engine Unplug the ignition key.

Check if the oil level in hydraulic oil tank between the markers on dipstick, and add it if needed. ..

Caution: Hydraulic oil tank has pressure, therefore slowly open its cap to release pressure before adding of oil.

Open the hydraulic oil tank to add oil and then

check the oil level again. .

10. Put the cap back on hydraulic oil tank

III. Change the hydraulic oil ---2000 h

Replace the hydraulic oil suctionfilter element ---- every 1000 h

Caution: do not do so until the hydraulic oil cools down as it may be very hot.

Park machine on the flat ground.

Completely retract the arm cylinder and extend out the bucket cylinder, so as to locate themachine.

Lower the bucket onto theground.

Idle engine at low speed for5min.

Shut down engine Unplug the ignition key.

Dismantle the covers

Clean the top of hydraulic oil reservoir to avoid any dirt into its system.

Slowly open the hydraulic oil cap to release the pressure.

Loosen and take down the oil-pickup filter element cap.

0. Loosen and take down the drain plug at bottom of hydraulic oil tank to drain the oil out oftank.

1. Take out the oil-pickup filter and the levers.

Caution: the hydraulic oil tank has pressure. Slowly open the hydraulic oil cap to release the pressure

before taking off the cap!

2. Clean the filter and inside of hydraulic tank.

3. Use oil -pickup pump to suck the oil residue out of bottom of hydraulic oil tank.

4. Put on the filter and the levers to make sure the filter is correctly fixed onto the outlet.

5. Clean and re-install the drain plug onto the bottom of tank.

6. Add the oil until between markers on oil dipstick.

7. Put on the oil-pickup filter element cap to make sure the filter and the levers are at correct position and then

tighten the bolts to 49N.m.

Important: with no oil in hydraulic pump, starting up of engine may damage to hydraulic pump!

18. Tighten the oil tank cap.

19. With engine idling at low speed, slowly and steadilycontrol

the lever for 15min to drain the air out of hydraulicsystem.

20. Completely retract the arm cylinder and extend outthe

bucket cylinder, so as to locate the machine.

21. Lower the bucket onto the ground.

22. Turn off the engine. Unplug the ignition key.

23. Check the hydraulic oil level in hydraulic oil tank and add it if needed.

V. Inspection of hose and pipeline

--- Each day

---every 250 h

Caution: any sprayed fluid could penetrate your skin, leading to personal casualty!

Therefore, use a paperboard to check for leakage.

In addition, care must be taken to keep your hands and body away from pressure oil.

In case of accident, please immediately go to doctor with trauma experience. Any fluid into skin has to

be removed in a few hours, which may lead to gangrene.

Caution: leaked hydraulic oil and lubricant may lead to fire or personal casualty!

Park machine on the flat ground. Lower the bucket onto the ground. Shift the pilot switch to Lock Turnoff

the engine. Unplug the ignition key.

Check if there is lost part, loosened pipe clamps, twisted hose, pipeline or hose rubbing with each other. In

case of any abnormal, please replace or tighten it according to table 1-3.

Tighten, repair or replace any loosened, damaged or lost pipe clamps, hoses, pipes, oil cooler and flange bolts.

Do not bend or impact any pressure pipeline.

Never install any bent or damaged hose orpipeline.

Caution: related positions of check points and the abnormalities

Please use the genuine excavator parts

Interval (h)

Check points

Abnormal

Measures

Replace it

Hose surface

Hose end

Leakage 1

Leakage 2

Leakage 3

Every day

Tighten or replace the

hose or O-ring

Connector body

Crack 4

Replace it

Hose surface

Hose end

Crack 5

Reinforcing material

protruded 6

Hose surface

Hose

Every 250h

Local part protruded 7

Bend 8

Change it (proper bending

radius)

Hose

Bend 9

Hose end and joint body

Deformation or corrosion

Replace it

Fuel system

capacity of fuel tank: 7L

Interval (h)

250

Parts

Quantity

100

500

1000

2000

Drain dirt out of collector of fuel

tank

★

Check the oil-water separator

Change the oil-water separator

★

Leakage

★

Check the

fuel hose.

Crack / twist / others

★

Maintenance interval under normal conditions

Recommended fuel:

Merely use the quality diesel (selection of fuel grade should be dependent on environmental temperature).

Fill up the fuel

Park machine on the flat ground.

Lower the bucket onto ground.

Idle engine at low speed for 5min.

Shut down engine Unplug the ignition key.

Caution: fuel should be disposed carefully. Before filling of fuel, turn off engine. Nosmoking

before filling fuel or with fuel system working.

Pay attention to the fuel scale. Add the fuel if needed.

Important: keep any dirt, dust, water or other foreign material from getting into fuel system!

While filling of fuel tank, make sure the fuel is not sprayed on machine and added properly.

Put the cap back on fuel filler to avoid any lost or damage.

Inspection of oil-water separator ---every 200h

Oil-water separator ① is used to separate the water or sediment from fuel. Oil-water separator ① has a float able

to rise up when water becomes full. When there is water or sediment in the collector of oil-water separator, please

drain oil-water separator ①.

Important: shorten the inspection interval of oil-water separator ①if there is excessive water in the fuel!

Drain steps:

Caution: the drain plug is designed to be counter - thread type and should be turned with hands, instead of vise

and wrench for protection of threads.

Manually loosen the drain plug at bottom of oil-

water separator.

After the draining, manually tighten the drain to

ensure no leakage of oil or air.

Caution: after the draining, make sure air is drained out

of fuel system to make sure the engine could start up

normally.

Electrical system - battery

I. Check the battery electrolyte level and the terminals.

Caution: gas inside of battery may explode it. Therefore, keep any spark and flame away from battery.

Use a flashlight to check the electrolyte level. In addition, the sulphuric acid in battery electrolyte is as toxic as to

burn your skin or your cloth holes or to blind your eyes. . .

Therefore, take the following methods to avoid any rick:

Refilling of battery should be done at well-ventilated site.

Put on goggles and plastic gloves.

Care must be taken not to spray out the electrolyte.

Use the proper measures to assist battery startup.

If touched with acid:

Rinse the skin

Use the soda or the lime to neutralize the acid.

Rinse eyes for 10 - l5 min and then go to doctor.

Caution:

a. Always firstly disconnect the battery clips (-) away from the ground and then lastly connect it.

b. Always keep the terminals at top to battery and the breather clean, to avoid the battery from discharging.

Check if the battery terminal is loosened or rusted. Coat the terminals with vaseline to avoid any corrosion.

Replace the battery

There is a 12V battery with one negative pole (-) grounded.

If battery cannot be charged or store any electricity, replace the battery with same model.

Replace the fuse.

If the electrical device does not work, please firstly check the fuse.

Important: please install the fuse with correct amperage, so as to prevent against burning of electrical system due

to overloading!

Others

Interval (h)

250 500 1000

Parts

Quantity

100

2000

4000

Check if the bucket teeth is worn or

loosened.

★

Change the bucket

—

If needed

Replace the bucket and connect the

new one to machine.

If needed, replace the bucket and connect the new one to

machine.

Adjust the connecting rod of bucket

Take down the traveling lever

Check and replace the fuse

Check the track defection

If needed

★

Every 3 years

★

Maintenance of tensioner

★

Check the fuel injection timing

—

If needed

Measure the compression pressure of

engine

—



Check the starter and the A/C

generator

Check the bolts and nuts for

tightening torque



★

Note:

★





Maintenance interval under normal conditions

Maintenance needed at the first inspection

Contact dealers or Rhinoceros.

Check the bucket teeth --- each day

Check if the bucket teeth is worn or loosened.

Worn beyond the service limit, the bucket teeth may be replaced.

Bucket tooth dimensions mm

New

Service limit

130

Caution: care must be taken to avoid the metal scrap from flying out, leading to personal injury. Wear

the goggles or the safe glasses or safe devices suitable for operations!

Change the bucket

Caution: while hitting out or into the connecting pin, care must be taken to prevent against any

personal injury due to out-flied metal scrap. Wear the goggles or the safe glasses or safe devices suitable for

operations!

Park the machine on flat ground and lower the flat surface of bucket onto ground to make sure the bucket

does not move after the removal of pin.

Slide the O-ring out, as shown in the figure.

Remove the bucket pins A and B to separate the bucket and the arm. Clean the pin and its pin hole and then

properly grease them.

Adjust the arm and the new bucket correctly, and make sure the bucket does not roll away..

Install the bucket pins A andB.

Put the locker and ring onto pins A andB.

Adjust the connection clearance of bucket at pin A. Refer to the way to adjust the bucket connection clearance.

Grease the pins A andB.

Start up engine and run it at low speed. Slowly rotate the bucket to two directions to check if there is any

interference to movement of bucket. Do not use any machine with interference, which should be solved

immediately. .

Check the bolts and nuts for tightening torque

…every 250 h (initially at 50 h)

…

Check the tightness at initial 50h and then every 250 h. Tighten it to the set torque if needed. Replace it with bolts

and nuts with same or higher grade.

Important: please use the torque wrench to check the torques of bolts and nuts!

Metric bolts and nuts

Thread dimensions

Standard torque (N.m)

Thread dimensions

Standard torque (N.m)

160±30

12±3

28±7

M14

M16

M20

M30

240±40

M10

M12

55±10

100±20

460±60

1600±200

. Torque of main components: (N.m)

Thread dimensions

Recommended torque

M16 bolts fixing the traveling motor

M16 bolts fixing the sprocket

252±39.2

570±60

M20 bolts fixing the slewing bearing

M20 bolts fixing the swing mechanism

570±60

Important:

Before installed, the bolts and nuts should be cleaned.

Grease the bolts and the nuts (such as the white zinc b able to be dissolved to lubricant), so asto stabilize

their abrasion coefficient.

The counterweight bolts should be kept tightened up.

Caution: all the tightening torques should be expressed with kgf.m.

For example: use a wrench with 1m long to tighten the bolts and nuts, and apply 12kgf of force to the end of

wrench, generating the following torque:

m×12kgf=12kgf.m

To generate the same torque with 0.25m wrench: 0.25m×y=12kgf.m

Needed force: y=12kgf.m／0.25m=48kgf

Maintenance under the special cases

Operational conditions

Precautions for maintenance

Before operation, check all the drain plugs are tightened up.

Moor land, rainy or snowy

On beach

After operation, clean machine and check bolts and nuts for break, damage,

looseness or loss. Lubricate all parts to be lubricated on time.

Before operation, check all the drain plugs are tightened up.

After work, thoroughly clean the clean to remove the salt. Frequently maintain

the electrical system from being corroded.

Air filter: clean the filter element periodically or at shorter interval

Radiator: clean the oil cooler screen to avoid any blockage.

Dusty environment

Stony roads

Fuel system: clean the filter and its element periodically or at shorter interval.

Electrical devices: periodically clean it, specially the AC generator and starter’s

rectifier.

Track: careful operations Frequently check if bolts and nuts are broken, damaged

or lost. Loosen the track a little than the usual.

Work equipment: parts may be damaged on stony roads, and therefore please use

the reinforced bucket or heavy-duty bucket. .

Fuel: use the high fuel suitable for low temperature

Lubricant: hydraulic oil and engine oil with dry quality and low viscosity.

Battery: keep the battery fully charged and maintain it at shorter interval. The

electrolyte may be frozen if it is not fully charged.

Freezing cold

Track: keep the track clean. Park the machine on solid ground to avoid the track

frozen.

Roof at driver seat: add the protective for cab roof if needed to prevent the

machine from being damaged with falling stone.

Falling stone

Storage of machine

Repair any worn or damaged parts, and put the new one if needed. .

Clean the primary air filter elements.

If possible, retract all the hydraulic cylinders. If not, grease all the plungers exposed out ofcylinder.

Lubricate all the grease points.

Put the track on the solid and long pad.

Cleaning of machine especially in winter, clean each part of excavator, especially thetrack.

Fully charged, the battery should be stored at dry and safe site. If battery cannot be taken down, separate the

battery negative pole from (-) pole.

Painting if needed to avoid rusting.

Store the machine at dry and safe site. If outdoors, it should be covered with water-proof cloth.

0. If machine is to be stored for long time, run it at least once each month.

Chapter XII Troubleshooting

Section I General

To ensure excellent performance of H12 excavator, high quality Machine's performance and service life are

determined not only by manufacturing quality and assembling quality,

but also maintenance quality.

The marketing representative and service engineer shall remind the user that preventive maintenance is the easiest

and most economical one among various ways of maintenance.

There are daily inspection and long-, medium- and short-term maintenance according to maintenance frequency.

Section II Troubleshooting of mechanism system

Symptom

Possible causes

How to solve

The loose fasteners make noise.

1. Inspect and tighten

Noisy structural components

2. Aggravated

abrasion

between

Adjust the clearance to less

than 1mm

bucket and end face of bucket rod

Deformed spring and weakened

elasticity of bucket tooth pin

Bucket teeth have dropped

during operation

Change the bucket tooth pin

2. Unmatched bucket tooth pin and

seat

Loose crawler

1. Tighten the crawler

The crawler has tangled up

2. The driving wheel moves fast in

front on rugged road.

2. The guide wheel shall move

slowly in front on rugged road

Section III Troubleshooting of hydraulic system

Symptom

Possible causes

How to solve

Low oil level of hydraulic oil tank that the

main pump sucks no oil

Add enough hydraulic oil

Change the filter and clean the

system

Oil filter is blocked

Engine coupling is damaged (such as plastic

plate, elastic plate)

Change

The main pump is damaged

Change or repair the main pump

Adjust to regular pressure. If it fails

to increase the pressure of servo

overflow valve, disassemble to wash;

if the spring is fatigue, add a washer

or change the spring.

The whole excavator

does not move

The servo system pressure is low or zero

Adjust to regular pressure. If it fails

to increase the pressure, disassemble

and wash. If the spring is fatigued,

ass a washer or change the spring.

The safety valve is set at low pressure or

stuck.

Oil suction pipe of main pump explodes or

comes off

Change with a new one

Symptom

Possible causes

How to solve

The main pump supplying fuel to unilateral

crawler is damaged.

Change

The main valve rod is stuck and the spring is

broken

Repair or change

Change

The unilateral crawler

fails to move

Traveling motor is damaged

The upper and lower chambers of swivel

joint are connected

Change the oil seal or clean the

assembly

Fuel pipe of traveling system explodes.

Less oil in hydraulic oil tank

Low engine rpm

Change

Add enough hydraulic oil

Adjust engine rpm

Low system safety valve pressure

Serious leak inside the main pump

Adjust to specified pressure

Change or repair the pump

The traveling motor, rotation motor and

cylinder are worn of different degree, which

causes internal leak.

Change or repair the worn parts

The aged sealing components,

worn

The whole excavator

moves slowly or

powerless

Change hydraulic oil, change sealing

components of the whole machine,

adjust the fit clearance and pressure

of hydraulic components.

hydraulic elements, degraded oil of old

excavator cause the operation speed becomes

powerless along with the increase of

temperature.

The blocked engine filter causes serious

decrease of loaded rpm and even flames out.

Change the element

The blocked hydraulic filter accelerates

abrasion of pump, motor and valve and leads

to internal leak.

Clean and change the element

according to the maintenance

schedule.

Serious between main valve rod and valve

hole causes serious internal leak

Repair the valve rod

Change the oil seal and change the

groove if it is damaged

Central rotation connector is damaged.

The high pressure chamber and low pressure

chamber of traveling operation valve is

connected.

Change

The right and left

traveling systems do not

move (no other

Serious leak inside the traveling operation

valve

Change

abnormalities)

Low overloaded pressure of traveling valve

of main valve or the valve rod is stuck.

Adjust and grind

The left and right traveling reducers fail

The left and right traveling motors fail

The oil pipe explodes

Repair

Change

Wrong adjustment of variable point of main

valve or serious internal leak of a pump

Adjust or repair

Change

Deviation during

traveling (no other

abnormalities)

Internal or external spring of one traveling

valve core of main valve is damaged or

tightened

The traveling motor leaks inside due to

abrasion.

Repair or change

Symptom

Possible causes

How to solve

The sealing component of central rotation

connector is aged and damaged.

Change the sealing component

The left and right crawlers are of different

tightening.

Adjust

Boom (bucket rod and

bucket) move to one

direction only.

Main valve core is stuck or valve rod spring

breaks.

Repair or change

Boom valve rod is stuck or of low

overloaded pressure

Repair

Fuel supply pipe leaks, detached, O ring

damaged or pipe fitting is loose

Boom (bucket rod and

bucket) does not move.

Change the damaged component

Sandstone in main valve or the low pressure

chamber is connected to the high pressure

chamber

Change

Adjust

Boom (bucket rod and

bucket) drops too quick

or the cylinder drops at a

certain height even it is

not operated due to dead

weight

Low overloaded valve pressure

Serious internal leak of cylinder

Loose oil pipe fitting, damaged O ring

Change the sealing component,repair

the inner wall or groove of cylinder

or change the cylinder.

Change

Serious internal leak of multi-way valve

or sandstone inside it

Boom (bucket rod and

bucket) works

Low overloaded pressure

Adjust

Serious internal leak of oil cylinder

Change the oil seal

powerlessly

The main valve is disabled due to internal

leak.

Repair or change

multi-way valve core is stuck or

serious internal leak

Grind or change

Change

multi-way valve rod spring breaks

Boom (bucket rod and

bucket) moves even it is

not operated

Leak of working cylinder, or the working

device drops due to dead weight

Change the oil seal

Low pressure of overload overflow valve or

the spring breaks

Adjust to specified pressure. Change

the spring if it is broken.

Wrong grade of hydraulic oil for excavator

Change the hydraulic oil

Wash

Hydraulic oil cooler surface is polluted by oil

and dirt, which blocks the air hole.

Hot hydraulic oil

Low oil level of hydraulic oil tank

Add enough hydraulic oil

The hydraulic components such as motor,

main valve and oil cylinder or sealing

components are seriously worn and cause

internal leak, which increases the oil

temperature. Traveling rotation and working

device are delayed and powerless. The hot

temperature degrades the hydraulic oil. The

safety valve is of poor air tightness, which

leads to overflow.

Change the elements in time

Hydraulic oil pipe breaks

Change

No action of rotation (no

Symptom

Possible causes

Rotary valve rod on main valve is stuck.

Rotary motor is damaged

How to solve

Repair

other abnormalities)

Repair or change

Change

The rotation support is damaged.

The right and left rotation of multi-way

valve is of different overloaded pressure

Adjust

Indifferent left and right

rotation speed (no other

abnormalities)

Rotation valve rod of multi-way valve

is slightly stuck.

Change pipe fitting and sealing

components

Serious external leak of hydraulic oil pipe

Low overloaded pressure for rotation of

multi-way valve

Adjust

Delayed or powered

rotation (no other

abnormalities)

Serious internal leak of rotary motor

Repair or change

The high and low pressure chambers of

multi-way valve are connected, sand hole on

valve body due to casting, which causes one-

way action or linked actions

Change

The rotation mechanism

moves even it is operated

Main valve rod spring breaks

Change

Low oil level of hydraulic oil tank

The oil contains too much moisture and air

Safety valve of multi-way valve makes noise

Damaged coupling

Add oil

Change

Adjust

Change

The excavator makes

abnormal noise and

Vibration caused by loose pipe clamp

Adjust

shakes during operation. Blocked filter

Change

Air exists in oil suction hose

Release the air

Adjust

Uneven engine rpm

The bearing of working device is not

lubricated or scraped

Apply lubrication oil or change the

shaft or sleeve

Damaged sealing components

Change the sealing components

Coat, paint, repair or change

A groove is found on the piston rod due to

Powerless oil cylinder or abrasion or detachment of chromium coating

oil leak

of piston rod, which causes oil leak.

The air in the cylinder causes shaking noise

during operation

Release the air

Section IV Troubleshooting of electrical control system

Fault codes of electrical control system of excavator

The engine fails to start

The engine flames out during operation

The engine fails to flame out

Automatic slow-down does not work

Slewing and traveling of all working devices.

Principle diagram

The engine fails to start

Fault description

●

The engine fails to start

Low engine rpm

Pump fault

Adjust to regular rpm

Change

The fuel pump system does not

supply fuel or supply less fuel

Less fuel in the tank

Add fuel

Fuel tube breaks, tube connector is loose

and O ring is damaged

Change

Possible causes

Standard value in regular condition and reference value of fault diagnosis

Battery voltage

Above 12V

Color of charge state densimeter

Low battery

Green (if it is white, change the battery)

In case the fuse is burnt, the GND fail may happen.

Fuse F1 and F11 fail

If he monitoring indicator on the monitor panel is not illuminated, inspect the

circuit between battery and specified fuse.

★

Turn the start switch of engine to OFF as preparation and keep it at OFF

during diagnosis.

Engine ignition

switch fault

Ignition switch

Position

OFF

Resistance

1MΩ

Between 30 and 17

Start

Below 1Ω

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis.

85-86

Resistance

200-400Ω

Above

Starter relay K3 fault

7-30

MΩ

Below 1Ω

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis.

7a-30

★

Security lock switch

fault (open circuit

inside)

Lock rod

Resistance

Possible causes

Standard value in regular condition and reference value of fault diagnosis

Unlocked

Locked

1MΩ

Between 105 and

GND

Below 1Ω

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis. If all PS, GND, signals and engine start input are correct while engine

start output is abnormal, the engine starter relay fails.

Start motor fault

(open circuit or short

circuit inside)

Engine or start motor

Engine start switch

Voltage

PS; terminal B and

GND

0~30V

Start

Input of engine start,

terminal C and GND

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis.

Alternator fault

Voltage

Below 1V

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis.

Disconnected wire

harness (disconnect

from connector or

poor contact)

Resistance

Below 1

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

diagnosis.

Poor GND of wire

harness (contact with

earth circuit)

Resistance

Above 1M

Below 1V

★

Turn the start switch of engine to OFF as preparation and keep it at OFF during

Short circuit of wire

harness (contact with

diagnosis.

4V circuit)

. Engine flames out during operation

Symptom Engine flames out during operation

Voltage

●

Standard value in regular condition and reference value of fault

diagnosis

Causes

Disconnected wire

★Turn the start switch of engine to OFF as preparation and keep it at

harness (disconnect from

connector or poor

contact)

OFF during diagnosis.

Between CN-12T ② and CN-132F ⑥

Resistance

Below 1

★

Turn the start switch of engine to OFF as preparation and keep it at

Poor GND of wire

harness (contact with

earth circuit)

OFF during diagnosis.

Between CN-12T ② and CN-132F ⑥

Resistance

Above 1M

Section V Troubleshooting of diesel engine

Symptoms of failed startup of engine:

When starting the engine, the starter drives the engine but the engine fails to be started.

Possible causes:

(

1) Low battery;

2) Battery terminal is rusted or loose;

3) Battery earth wire is rusted or loose or poor GND of engine;

4) Starter relay armature fails to disengage.

5) Ignition switch fault or starter fault;

How to solve:

(

1) Low battery is caused by electrical appliances that are not powered off in previous day. Next time, do not

forget to power off all electrical appliances at the end of the day. If you have well charged the battery during

driving the day before, the battery shall be on a full charge at the end of the day. For failed start-up caused by

low battery, change the battery pack or connect to another battery pack in parallel to startthe engine.

(

2) Clean the battery terminal, tighten the PS wire clip to contact the PS wire with battery terminalreliably.

3) Clean the battery earth wire terminal to ensure reliable GND; ensure reliable GND of engine;

4) Repair or change starter relay;

5) Inspect and repair ignition switch and inspect and repair the starter;

6) Long period operation of battery may increase the internal resistance; therefore, it is necessary to repair the

battery and correctly charge the battery and change with new battery pack if necessary; the battery shall be

fully charged to ensure successful start-up of engine.

Check if it is low fuel level that makes hard to start the diesel engine

Symptom:

When starting the engine, the starter runs at acceptable rpm; however, it fails to start the engine.

Possible causes:

(

1) Fuel tank is empty;

2) Fuel supply system channel fault;

3) Air, water or foreign matter exist in fuel system, which block the system;

4) Fuel pump fault;

5) Engine fault;

How to solve:

(1) Fill the fuel tank with standard fuel, start the engine and run the engine to deliver the fuel tocarburetor;

(2) Inspect pipeline of fuel supply system, fuel filter and fuel pump; change blocked and damaged assembly if

necessary to ensure unobstructed fuel supply.

(3) Release air in fuel system. If the engine can not be started due to air blockage, decrease the temperature

properly.

(4) Inspect the fuel pump. Only when the fuel pump works well can the fuel supply be unobstructed. Fuel supply

seldom fails and air blockage and water blockage seldom happen when the fuel supply of fuel pumpis large.

(

5) Inspect and repair the engine. Only when the engine works well can the start-up fail never or seldomhappen.

Check if it is hard to start the engine

Symptom:

(

1) Starter runs at correct rpm and drives the engine; however, it is hard to start theengine.

2) It is hard to start the engine when it is cold.

3) It is hard to start the engine when it is hot.

Possible causes:

(

1) Fuel filter is blocked;

2) Fuel pump fault;

3) Wrong injection timing;

4) Low temperature of oil and intake air;

5) Intake air filter is blocked.

6) Leak of fuel tube;

7) Starter fault;

8) Improper start operation;

9) Wrong fuel grade;

10) Engine fault;

How to solve:

(

1) Inspect and change the fuel filter;

2) Inspect and change the air filter element;

3) Inspect and adjust the fuel pump;

4) Inspect the fuel tube and oil channel to ensure unblocked oil supply;

5) Inspect the starter and start control device for reliable operation.

6) Start the engine in correct ways.

7) Add fuel of correct grade and discharge the water in fuel in the low part of fuel tank ifnecessary;

8) Repair the engine.

Check if the starter fails to start the engine

Symptoms:

(1) Turn the ignition switch to ON, the starter does not work.

(2) The driving gears of starter do not engage.

(3) The driving gears of starter fail to disengage.

(4) Low engine rpm and uneven enginerpm;

Possible causes:

(1) The battery is not fully charged.

(2) Terminals of battery are loose.

(3) Battery earth wire is loose.

(

4) Start circuit is disabled.

5) Electromagnetic relay armature is adherent;

6) Starter fault

7) Driving gear of starter is stuck by engine flywheel gear ring;

8) Driving gear of starter adheres to the bearing.

9) The starter fails to drive the engine;

10) Engine fault;

How to solve:

(

1) Check if the battery is fully charged; if not, charge it; change the battery if necessary.

2) Connect the battery terminal and connector;

3) Repair the battery earth wire.

4) Inspect the start circuit and ensure the terminal of starter shall be live.

5) Inspect starter electromagnetic relay to eliminate fault of electromagnetic relay; it shall obvious to hear the

sound making by the relay when it sucks and separates.

(

6) Inspect and repair the starter.

7) Start again to engage the starter driving gear and engine flywheel gear.

8) Inspect the bearing on the end of starting shaft of starter;

9) Small torque of starter, change the starter if necessary.

10) Repair the engine to ensure sound operation ofengine.

Attachment: BOM of vehicle parts

Exploded drawing of 1 . 0 T excavator assembly

S/N

Name

Quantity

Remark

Upper frame assembly

Lower frame assembly

Front work equipment assembly

Slewing bearing assembly

Connecting shaft between boom and upper frame

Pivot sleeve

Lower frame

Part Name

S/N

Part No.

1.1

Quantity

Remark

Welded dozer shovel

Welded lower frame

Slewing joint

1.2

1.3

1.4

Rubber crawler

1.5

Lock nut

1.6

Sprocket nuts

1.7

Drive wheel

1.8

Connecting disc

1.9

Sprocket bolts

1.10

1.11

1.12

1.13

1.14

1.15

1.16

1.17

1.18

Bolts fixing the track roller

Traveling motor

Track roller

Idler assembly

Pivot nuts

Connecting shaft of dozer shovel

Connecting shaft of cylinder

Cylinder of dozer shovel

Bolts fixing idler assembly

Upper frame assembly

S/N

Part No.

2.1

Part Name

Welded upper frame

Covers of rear housing

Covers of left housing

Covers of right housing

Welded inside support frame

Rear counterweight plate

Handrail

Quantity

Remark

2.2

2.3

2.4

2.5

2.6

1 set

2.7

2.8

Theseat

Upper frame assembly

S/N

Part No.

2.9

Part Name

Left- upper cover

Right - upper cover

L- shaped covers

Console

Quantity

Remark

2.10

2.11

2.12

2.13

2.14

2.15

2.16

2.17

2.18

2.19

2.20

2.21

2.22

2.23

2.24

2.25

2.26

2.27

2.28

2.29

2.30

2.31

2.32

2.33

2.34

2.35

2.36

2.37

Pedal

Hydraulic oil tank

The front of the bracket A

The front of the bracket B

The seat plate

multi-way valve

Battery platen

Master cylinder

Coupler

Pump disc

Engine

Rear bracket base of engine

Front bracket base of engine

Main valve holder

Battery

Rotary motor

Slewing bearing

Dust cover

Main power switch

Manual accelerator

Key starter

Traveling handle

Work handle

Front shovel handle

Slewing joint pallet

. Front work equipment

S/N

Part No.

3.1

Part Name

Boom

Quantity

Remark

3.2

Arm

3.3

Bucket

3.4

Connecting rod

3.5

Push rod

3.6

Boom cylinder

3.7

Arm cylinder

3.8

Bucket cylinder

3.9

Medium shaft of boom

Rear shaft of arm cylinder

Front shaft of arm cylinder

Front shaft of boom

Rear shaft of bucket cylinder

Medium shaft of arm

Front shaft of bucket cylinder

Front shaft of arm

3.10

3.11

3.12

3.13

3.14

3.15

3.16

Connecting shaft between bucket and

connecting rod

3.17

3.18

Shaft locker sleeve

VERSION.2022

Barrett Small Engine

H12 and H12R Mini Excavator Manual and Parts List

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