LGMG T65J User manual

LGMG North America Inc.
Maintenance Manual
T65J/T72J/T85J
Telescopic Boom
Mobile Elevating Work Platform
ANSI
！
WARNING
Before operation and maintenance, the
drivers and service personnel shall
always read and thoroughly understand
all information in this manual. Failure to
do so may result in, fatal accidents or
personal injury.
This manual must be kept with this
machine at all times.

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Contents
Contents.......................................................................................................I
Chapter 1 Maintenance...............................................................................1
1.1 Compliance....................................................................................... 3
1.2 Check the Safety Manual.................................................................. 3
1.3 Check for labels and signs................................................................ 3
1.4 Check for damaged, loose or missing parts...................................... 3
1.5 Check for Hydraulic Oil Level............................................................ 4
1.6 Check for Hydraulic Oil Leakage....................................................... 4
1.7 Check the Pivoting Support .............................................................. 5
1.8 Check for Batteries........................................................................... 5
1.9 Check the Wires ............................................................................... 6
1.10 Check for Tires and Hubs ............................................................... 7
1.11 Check the Drive Hub Oil Level........................................................ 7
1.12 Check for Exhaust Cover of Hydraulic Oil Tank............................... 8
1.13 Visual Inspection of the Hydraulic Oil.............................................. 8
1.14 Check the Wire Rope...................................................................... 8
1.15 Inspection of engine emission system............................................. 9
1.16 Inspection of fixing bolts and adjusting bolts of slewing reducer ... 10
1.17 Platform weighing structure lubrication ......................................... 10
1.18 Replacing the return filter of hydraulic tank................................... 10
1.19 Replacing the high-pressure filter element.....................................11
1.20 Replacing the air cleaner.............................................................. 12
1.21 Check the Boom Wear Pad........................................................... 12
1.22 Changing hydraulic oil and replacing the suction filter................... 12

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1.23 Engine maintenance- DEUTZ....................................................... 14
1.24 Regular Maintenance.................................................................... 21
1.25 Engine fault table.......................................................................... 22
1.26 Engine fault Codes ....................................................................... 25
1.27 Maintenance Schedule ................................................................. 31
Chapter 2 Schematics...............................................................................35

LGMG North America Inc. Maintenance Manual
III
Foreword
Thank you for choosing to use this Mobile Elevating Work Platform from LGMG North America. This
machine is designed according to A92.20-2021.The information specified in this manual is intended for
the safe and proper operation of this machine for its’ intended purpose.
For maximum performance and utilization of this machine, thoroughly read and understand all the
information in this manual before starting, operating, or performing maintenance on this machine.
Due to continuous product improvements, LGMG NorthAmerica reserves the right to make specification
changes without any prior notifications. For any updated information, contact LGMG NorthAmerica.
Ensure all preventive maintenance to the machine is performed according to the interval specified in the
maintenance schedule.
Keep this manual with this machine for reference at all times. When the ownership of this machine is
transferred, this manual shall be transferred with this machine. This manual must be replaced
immediately if it is lost, damaged, or becomes illegible.
This manual is copyrighted material. The reproduction or copy of this manual is not allowed without the
written approval of LGMG North America.
The information, technical specifications and drawings in this manual are the latest available when this
manual is issued. Due to continuous improvement, LGMG North America reserves the right to change
the technical specifications and machine design without notice. If any specifications and information in
the manual are not consistent with your machine, please contact the service department of LGMG North
America.
△
!WARNING
Only personnel who have been properly trained and qualified to operate or
maintain this machine can operate, repair and maintain this machine.
Improper operation, maintenance, and repair are dangerous and can cause
personal injury and death.
Before any operation or maintenance, the operator shall thoroughly read this
manual. Do not operate, perform any maintenance or make any repairs on this
machine before reading and understanding this manual.
The user shall load the platform strictly according to the load rating of the
platform. Do not overload the platform or make any modifications to the platform
without permission from LGMG North America.
The operation regulations and preventions in this manual are only applicable for
the specified use of this machine.

LGMG North America Inc. Maintenance Manual
IV
Safety Precautions
The operator of this machine shall understand and follow the existing safety regulations of state and
local governments. If these are unavailable, the safety instructions in this manual shall be followed.
To help prevent accidents, read and understand all warnings and precautions in this manual before
operation or performing maintenance.
It is impossible to foresee every possible hazard and the safety instructions in this manual may not cover
all safety prevention measures. Always ensure the safety of all personnel and protect the machine
against any damage. If unable to confirm the safety of some operations, contact LGMG North America.
The operation & maintenance prevention measures listed in this manual are only applicable to the
specified uses of this machine. LGMG North America assumes no responsibility if this machine is used
beyond the range of this manual. The user and the operator shall be responsible for the safety of such
operations.
Do not perform any operation forbidden in this manual in any situation.
The following signal words are applicable for identifying the level of safety information in this manual.
△
! Danger:
An imminent situation, that if not avoided, will result in severe injuries or death. This
is also applicable to situations that will cause serious machine damage, if not
avoided.
△
! Warning:
A potentially dangerous situation, that if not avoided, may result in severe injuries or
death. This is also applicable to situations that may cause serious machine damage,
if not avoided.
△
! Notice:
A situation, that if not avoided, may result in minor or intermediate injury. This is also
applicable to situations that may cause machine damage or shorten machine service
life.

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LGMG North America Inc. Maintenance Manual
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Chapter 1 Maintenance

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1.1 Compliance
1) You accept the proper training of safety
operation and machine maintenance, and
have corresponding aptitudes.
2) It is necessary to read, understand and
adhere to all safety regulations of this
manual, safety regulations of workplace
and applicable laws and regulations of
government.
3) Protective articles, such as safety helmet,
safety belt, work shoes, goggles and
protective clothing, have been equipped all
over the body, and the physical state is
excellent.
4) Operators can only conduct conventional
inspection and maintenance items as
specified in this manual.
5) Only technical maintenance personnel who
are trained and get corresponding
certificates may complete scheduled
maintenance.
6) Waste and old materials shall be disposed
according to government regulations and
work site rules.
7) Only LGMG North America approved parts
and consumables can be used.
8) Function test shall be always conducted
upon maintenance.
1.2 Check the Safety Manual
It is necessary for safe equipment operation to
keep the Operator and Safety Manual in good
condition. The manual shall be stored in a
container in the working platform provided by
each machine. An illegible or missing manual
will not provide the necessary safety and
operation information for safe operation.
1) Check that the storage container is on site
and in good condition.
2) Check that the Operator and Safety Manual
is complete in the storage container on the
work platform.
3) Check that each page of the manual is
identifiable and in good condition.
4) Put the manual in the storage file box after
use.
△
!If the manual need to be replaced,
please contact the service staff of
LGMG North America.
1.3 Check for labels and
signs
It is required to keep all safety and description
labels and signs in a good condition for safe
operation of the platform. Labels warn operators
and staff of many possible hazards in using the
platform. They also provide users with operation
and maintenance information. Illegible labels
cannot warn staff of steps or hazards and may
lead to unsafe operating conditions.
Refer to the label section in this operation
manual and use the label menu and instructions
to check that all labels are in place.
Check the clarity and damage of all the labels
and immediately replace any damaged or
illegible label.
△
!If the labels need to be replaced,
please contact the service staff of
LGMG North America.
1.4 Check for damaged,
loose or missing parts
This step is performed every 8 hours or every
day, whichever comes first.
Carrying out daily equipment status check is
necessary for ensuring safe equipment
operation and maintaining good equipment
performance. Incorrect positioning, repairing
damaged equipment, and loose or missing parts
may result in unsafe operating conditions.
1) Check for damaged parts for the whole
platform, and check for incorrect installation
or missing parts and components,
including:
 Electrical components, wirings and cables

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 Hydraulic hoses, connectors, valve blocks
and hydraulic cylinders
 Fuel and hydraulic tanks
 Wear-resistant pads
 Tires and wheels
 Engine and related components
 Limit switch and horn
 Nuts, bolts and other fasteners
 Platform entrance door
 Indicators and alarms
 Platform controller
2) Check the entire machine for:
 Cracks in welds or structural components
 Whether the platform, boom and chassis
are deformed or have cracked weld joints.
 Indentation or damage to the machine
 Ensure that all structural components and
other key components are complete and all
relevant fasteners and pins are in the
correct position and tightened.
1.5 Check for Hydraulic Oil
Level
This step is performed every 8 hours or every
day, whichever comes first.
Proper hydraulic oil level is crucial in operating
the machine. If the hydraulic oil is at an
improper level, the hydraulic components will be
damaged. Through a daily inspection, the
inspector can determine the hydraulic oil level
change which indicates that the hydraulic
system is faulty.
△
!Caution: Perform this step when
the boom is in the retracted position.
Park the vehicle on the flat site. Fully retract
the boom.
Figure 1-1 Oil Level Sight Gauge
Examine the oil level on the hydraulic oil
tank, i.e., level shall fall within the M range
shown as Figure 1-1, and in the case of
level within the L range, it is necessary to
add hydraulic oil
Use temperature
Oil type
The lowest temperature＞
-25℃
L-HV 32 low temperature
hydraulic oil
-40℃＜The lowest
temperature≤-25℃
L-HS32 ultra low
temperature hydraulic oil
The lowest
temperature≤-40℃
10# aviation hydraulic oil
1.6 Check for Hydraulic Oil
Leakage
This step is performed every 8 hours or every
day, whichever comes first.
△
!Caution: Personal injury danger,
i.e., leaking hydraulic oil can penetrate
or burn skin. Wear goggles and
protective gloves.
Leakage of high-pressure oil may be
invisible to eyes, use cardboard or wooden
boards as a search tool for hydraulic oil
leakage. Hands shall be prohibited from
being used for leakage confirmation. Inspect
oil drops or residual oil on the following
components:

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Hydraulic oil tank, filter, pump, hydraulic oil
cylinder, motor, reduction gear, valve block
and hydraulic tubing.
Rear of boom, fly jib, upper side of turntable,
upper and lower sides of chassis, and
ground underneath equipment.
1.7 Check the Pivoting
Support
The turntable shall rotate smoothly without
jamming, and meshing play between the
turntable bearing and the swing gearbox is
measured using a feeler gauge, which shall be
between 0.2mm and 0.3mm. Measurement is
conducted every 250 h or quarterly.
Figure 1-2
Unscrew bolt 6 and locking nut 5
Turn adjusting bolt 4 to adjust the position
of the swing gearbox
Measure play between the turntable
bearing and the swing gearbox using a
feeler gauge
If the play ranges from 0.2mm to 0.3mm,
tighten lock nut 5 and bolt 6
Measure play between the turntable
bearing and the swing gearbox again to
verify the measurement
Tighten bolt 6, and torque to (595±55)N.m.
1) Check lubrication in the turntable bearing
and the swing gearbox at intervals of 100
hours. It is necessary for maintaining
performance and maintenance life to
lubricate the turntable bearing frequently.
Incorrect lubrication will cause damage to
components.As shown in Figure 1-2, find
the grease port 3 on the side of the bearing,
swing the turntable multiple times while
filling grease until grease overflows from
the upper and lower fixed surfaces of the
bearing. Lubricating grease must be:
Lubrication EP2 or equivalent.
2) Inspect the lubrication of the turntable
bearing and the swing gearbox, if
necessary, clean the gear surface, and
recoat with grease.
△
! Caution: In the case of an
extremely dirty working environment,
increase the oil filling frequency.
1.8 Check for Batteries
This check item is performed every 250
hours or quarterly, whichever comes first.
Keep away from fireworks and remove all
rings, watches and other accessories. Wear
goggles, protective gloves and protective
clothing if necessary. Avoid touching the
spilled electrolyte with hands or other parts of
the body. Neutralize with baking soda and
the spilled electrolyte.
Good battery condition is essential for
machine performance and safe operation.
Improper voltage or damaged cables and
wiring may cause component damage and
dangerous situations.
Maintenance-free lead-acid battery
inspection:
Check that the battery locking lever is
secure
Check the wiring of the battery cable.
The wiring is firm and free from
corrosion.
Check whether the battery fluid leaks
and whether the battery is dry and clean.
Check the color of the battery
hydrometer as shown in the figure:

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Figure 1-3
Battery hydrometer
Hydrometer
color
Meaning and treatment
White
Lack of battery fluid. Please shut
down the machine and stop
using it
Black
Power loss or damage
Green
Measure the voltage of each
battery. If the voltage is lower
than 11V, it indicates that the
battery is damaged; The voltage
is between 12.4v-12.7, indicating
that the battery is in good
condition
If the color of the battery hydrometer is
green and the voltage is above 12V, but
the starter cannot be driven, please ask
the personnel trained and qualified for
the maintenance of the machine to
further test the battery.
Battery recharge:
Before charging, disconnect the
negative connection of the battery first,
and then the positive connection of the
battery.
Before replenishing electricity, clean the
end column and remove the oxide scale
on the surface.
△
!Note: If an external power
supply is required to charge the
battery, only the charger approved
by the LGMG North America can be
used.
Do not replenish the battery with
white eyes. Replace the battery.
When wiring after charging, connect
the positive wire first and then the
negative wire.
△
! Notice: Adding a terminal
protector and an anti-corrosion sealant
will help remove corrosion caused to
battery terminals and cables.
1.9 Check the Wires
This check should be performed every 250 h or
quarterly, whichever comes first.
It is important for safe operation and good
machine performance to keep the wires in good
conditions. Failure to find and replace the
burn-out, scratched, corroded or bent wires will
result in unsafe operating conditions and
damage to the parts.
Risk of electric shock/explosion
Contact with live circuits may cause serious
injury or death. Do not wear rings, watches or
other jewelry.
1) Check the following areas for burn-out,
scratched, corroded, bent or loose wires:
Engine wiring harness
All wire harness connectors to ground
control box
All wire harness connectors to platform
control box
Hydraulic manifold wiring
Battery harness
Cables on the primary, secondary and jib
booms
2) Check whether all wire harness connectors
are coated with insulating grease:
Ground control unit
Platform control unit
Harness connectors
Sensor
Hydrometer

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1.10 Check for Tires and
Hubs
This check item is performed every 250 hours or
quarterly, whichever comes first.
Keeping tires and hubs in a good condition is
critical for safe operation and good performance.
Failure of the tires and hubs may cause the
platform to tilt. If such failure is not found and
repaired in time, it will also cause damage to
platform parts.
1) Check treads and sides of tires for scratches,
cracks, punctures, and other abnormal
wear.
2) Check if the hubs are damaged, bent or
cracked.
3) Check whether or not the technological
screws for tires are detached. Upon the
detaching of screws, if there is slight or no
leakage of fillers, and no significant
deformation is found for the tire body, and
users can knock in screws which are
slightly larger than the diameter (about
5mm) of the vent hole with a hammer. If
leakage of a large quantity of fillers is found,
and the tire body deforms significantly, it is
necessary to reduce the height of the
working platform and replace the tires
timely.
4) Check for nut torque of tires:
T65J/T72J:305±25N.m
T85J:440±44 N.m.
1.11 Check the Drive Hub Oil
Level
Inspect the oil level of the drive hubs every 250
h or quarterly. Improper oil level will result in
reduced performance. Continuous use will
result in damage to components.
1) Inspect oil level of traveling gearbox
Figure 1-4 Traveling Gearbox
1. Oil filler 2. Viewing port
Drive the machine until one plug is located
at the horizontal position as shown as
shown in Figure 1-4.
Remove the viewing port plug at the
horizontal position, and inspect oil level.
Result: Oil level shall be flush with the
bottom of the viewing port.
If necessary, add oil at the oil filler until the
oil level is flush with the bottom of the
viewing port, select gear oil by referring to
Machine Specifications section.
Coat the plugs with pipe thread sealant and
install the plugs.
Repeat this step for every drive hub.
Figure 1-5 Swing Gearbox
1. Oil filler 2. Viewing port
2) Inspect oil level of swing gearbox
Remove the plug on the side and inspect
the oil level, as shown in Figure 1-5.
Result: Oil level shall be flush with viewing port
(2).
If necessary, add gear oil at the oil filler plug
until the oil level is flush with the bottom of

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the viewing port, select gear oil by referring
to the Machine Specifications section.
Coat the plugs with pipe thread sealant and
install the plugs.
3) Replace lubricant after the first 50h of use,
then every 1,000 h or yearly, whichever
comes first.
Condition
Oil viscosity brand
(API GL-5)
30°C＜The lowest
temperature
85W/140
-10°C＜The lowest
temperature＜30°C
85W/90
-30°C＜The lowest
temperature＜-10°C
80W/90
The lowest temperature＜
-30°C
75W
1.12 Check for Exhaust
Cover of Hydraulic Oil Tank
This check item is performed every 250 hours or
quarterly, whichever comes first.
An unobstructed hydraulic oil tank cap is
essential for good mechanical performance and
long service life of the platform. A dirty or
clogged exhaust cover may result in poor
platform performance. Given harsh working
environment, more frequent check is required.
①Remove the exhaust cover from the
hydraulic oil tank cap.
②Check for ventilation.
Result: Air can pass through the exhaust cover.
Result: If air does not pass through the exhaust
cover, continue with Step 3.
△
!Notice: Air is supposed to pass
freely while checking ventilation of the
oil tank cap.
③Carefully clean the tank exhaust cover with
mild solvent and dry it with low pressure
compressed air. Repeat Step 2.
Install the exhaust cover of the hydraulic oil
tank.
1.13 Visual Inspection of the
Hydraulic Oil
This check item shall be conducted every 250
hours or quarterly, whichever comes first.
Collect a sample of hydraulic oil and place in a
clear container. Visually inspect the hydraulic oil
for the following:
Color: oil should be a clear, light-honey
colored.
Appearance: oil should be clear and not
cloudy or visibly distorts the view through
the sight glass or container.
Contains no particles, foreign objects, or
other contamination.
The hydraulic oil can be inspected by smell
(can smell “hot” but not “burnt”) or rubbing
between fingers (should feel viscous and
free of any rough feel due to particles) If the
hydraulic oil passes all of the above
inspections, continue the scheduled
maintenance intervals. If the hydraulic oil
fails any of the above inspections, the
hydraulic oil must be tested by an oil
distributor or replaced.
Note: If the hydraulic oil has not been replaced
for two years, the oil must be tested every
quarter by an oil distributor until the oil fails the
test and is replaced. After the oil has been
replaced, continue the scheduled quarterly
maintenance inspection.
Note: When replacing the hydraulic oil, it
is recommended that all hydraulic filters
be replaced at the same time.
1.14 Check the Wire Rope
Figure 1-6 Boom Telescope System
1. Cover Plate
2. Extend Rope Anchor
3. Extend Rope
4. Extension Pulley Block

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5. Cover Plate
6. Retract Pulley Block
7. Retract Rope
8. Retract RopeAnchor
After long-term operation of equipment, the wire
rope will stretch, resulting in boom sections not
synchronized, separation of wire rope from
pulley, boom shaking during extension, contact
of wire rope to inner wall of boom sections or
rubbing between wire rope and inner wall of the
boom and other problems. It is necessary to
conduct periodic checks on the condition of the
wire rope. Inspect the stretching wire rope for
stretching every 250 h or quarterly.
1) Raise the boom to horizontal, extend the
boom, and inspect if the second-section
and third-section booms are synchronized
in the extension process of the boom. If the
third-section boom lags behind the
second-section boom, this means the wire
rope is loose.
2) Raise the boom to horizontal, extend the
boom, and inspect whether or not the
third-section boom shakes or if there is “flap”
sound from the wire rope whipping the
inside of the boom section during extension.
If this happens, it indicates the wire rope is
loose.
3) Remove the rear cover plate (1) of the
boom, and see if the extend rope anchor (2)
deflects to one side. See if the retract rope
anchor (8) deflects to one side. If deflection
exists, it means the wire rope is loose.
4) Raise the boom to horizontal, extend the
boom completely, remove the rear cover
plate (1) and the side cover plate (5), and
visually inspect for wear on the extension
pulley block (4,) the retract pulley block (6),
the extend rope (3) and the retract rope (7).
The pulley shall be fixed firmly secured
without play, non-uniform wear of the pulley
groove shall be less than 3mm, and the
wear of the pulley flange shall be smaller
than 10% of the original wall thickness.
There must be no loosening, breaks, and
serious corrosion in the wire rope. During
extension and retracting, there must be no
flapping in the pulley. In the case of any
abnormalities, stop using the machine
immediately and tag out the machine.
Replacement of the Wire Rope
It is required that this procedure should be
performed each 7000 hours or 12 years,
whichever comes first.
More frequent inspection or replacement (if
necessary) is required when:
The machine is operated in harsh
environment;
The boom involves seizure or unusual
noise during operation;
The machine is out of service for a long
time;
The boom is overloaded or subject to
continuous impact load;
The boom is exposed to electric arc, by
which the strands in the rope may be fused
together.
Regular replacement of wire rope is essential
for machine to maintain good performance and
safe operation.
Please refer to the Service manual for steps for
replacement of boom extend and retract cables:
How to replace the wire rope.
1.15 Inspection of engine
emission system
This inspection shall be performed every 250h
or every quarter, whichever comes first.
A normal exhaust system is very important to
the performance and service life of the engine,
and if the exhaust system is damaged,
component damage or other safety hazards
may be caused.
△
! CAUTION: Do not perform the
inspection when the engine is running,
and instead, remove the key to prevent
misoperation.
△
! CAUTION: Do not perform the

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10
inspection until the engine is cooled
down.
1) Ensure that all fasteners are well tightened;
2) Check all welds;
3) Check for exhaust leakage;
4) Check the welds and connections for
carbon deposit.
1.16 Inspection of fixing
bolts and adjusting bolts of
slewing reducer
This inspection shall be performed every 500h
or every 6 months, whichever comes first.
An appropriate tightening of fasteners is
essential for the safe operation of the machine,
and if any fastener is loose, machine damage or
other safety hazards may be caused.
Figure 1-7
Tightening torque of bolt 1: 595±55N.m
Tightening torque of bolt 2: 190±19N.m
1.17 Platform weighing
structure lubrication
This operation is performed every 500 hours or
every six months, whichever comes first.
Shorten the maintenance interval in harsh
working environments.
Regular lubrication of the platform weighing
structure is necessary to maintain good
equipment performance and safe operation.
Incorrect lubrication will lead to component
damage.
Figure 1-8
Locate the pin grease nipple at the triangle
bracket assembly.
Fill grease until grease spills on both sides
of the triangle bracket assembly. (Lithium
base grease)
Wipe off spilled grease.
1.18 Replacing the return
filter of hydraulic tank
△!Risk of personal injury. Be careful
of hot oil. The contact with hot oil will
cause severe burns.
△!This step shall be performed when
the engine is shut down.
△!In a dusty working environment,
this step should be performed more
frequently.
Perform this step once every 500 h or every six
months, whichever comes first.
Replacing the return filter is crucial for superior
performance and service life of the machine.
Dirty or clogged filter may affect the
performance of the machine, and if not replaced,
may cause damage to the parts. The filter shall
be replaced frequently in a harsh working

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11
environment.
Park the machine on a solid and level ground.
Lower the arm rod and make the machine
retracted.
Figure 1-9
No.
Description
Tightening
torque
1
Connecting bolt between
oil return pipe and filter
52±5N.m
2
Return filter
-
3
Connecting bolt between
filter and tank
90±9N.m
4
Air cleaner
-
①Disconnect the main oil return pipe
from the return filter.
②Remove the plug on the return filter.
③Disconnect the return filter from the
hydraulic tank.
④Remove the old filter and install a new
one.
⑤Refit the main oil return pipe and the
plug.
⑥Use a marker to write down the
replacement date on the filter replacement
record.
⑦Implement any arm rod function with
the GCU.
⑧Check the filter components for oil
leakage.
1.19 Replacing the
high-pressure filter element
△!Risk of personal injury. Be careful
of hot oil. The contact with hot oil will
cause severe burns.
△!This step shall be performed when
the engine is shut down.
△!In a dusty working environment,
this step should be performed more
frequently.
Perform this step once every 500 h or every six
months, whichever comes first.
Replacing the high-pressure filter element is
crucial for superior performance and service life
of the machine. Dirty or clogged filter may affect
the performance of the machine, and if not
replaced, may cause damage to the parts. The
filter element shall be replaced more frequently
in a harsh working environment.
Park the machine on a solid and level ground.
Lower the arm rod and make the machine
retracted.
1) Place a suitable container under the filter.
2) Remove the nut at the bottom of the filter
cover with a wrench, and remove the filter
cover.
3) Take out the filter element from the filter
cover.
4) Check the seal of the filter cover, and
replace it when necessary.
5) Install a new high-pressure filter element,
and tighten it.
6) Wipe off any oil droplets splashed during
installation.

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7) Use a marker to write down the
replacement date on the filter replacement
record.
8) Implement any arm rod function with the
GCU.
9) Check the filter components for oil leakage.
1.20 Replacing the air
cleaner
Perform this step once every 1000 h or every
year, whichever comes first.
In a dusty working environment, this step should
be performed more frequently.
△!This step shall be performed when
the engine is shut down.
1) Remove the old air cleaner.
2) Install a new air cleaner.
1.21 Check the Boom Wear
Pad
Perform this step once every 1000 h or every
year, whichever comes first.
1) The wear pad is located on the housing
surface and inner wall of the boom to
reduce friction. It is necessary for safe
operation of the machine to maintain the
wear pad in good condition. Continuous
use of wear pads that are extremely worn
will result in damage to components and
unsafe operating conditions.
2) Extend the boom to check if the wear pad
loosens, if the wear pad loosens, torque the
securing bolt. Inspect play between the
wear pad and the boom, if the play is more
than 1mm, arrange shims to achieve zero
play and zero drag. Replace the wear pad if
necessary. Part numbers of shims，please
refer to the Parts Manual, and select the
correct parts. Upon installation of the shims,
it is necessary to extend the boom multiple
times to eliminate potential binding.
1.22 Changing hydraulic oil
and replacing the suction
filter
△!Risk of personal injury. Be careful
of hot oil. The contact with hot oil will
cause severe burns.
△!This step shall be performed when
the engine is shut down.
△!In a dusty working environment,
this step should be performed more
frequently.
Perform this step once every 2,000 h or every
two years, whichever comes first.
Changing hydraulic oil and replacing the filter
are crucial for superior performance and service
life of the machine. Dirty hydraulic oil and filter
may affect the performance of the machine, and
if not replaced, may cause damage to the parts.
Hydraulic oil and filter shall be replaced more
frequently in a harsh working environment.
Before changing the hydraulic oil, check the
hydraulic oil to verify if oil change is necessary.
If the hydraulic oil has passed the inspection
conducted at an interval of 2000 h or two years,
and thus not been changed, it shall be checked
on a quarterly basis. Change the hydraulic oil if
it does not pass the inspection.
△! CAUTION: The hydraulic oil
suction filter should be replaced
during change of the hydraulic oil.

LGMG North America Inc. Maintenance Manual
13
Figure 1-10
No.
Description
Tightening
torque
1
Oil suction flange bolt
28±3N.m
2
Oil drain flange bolt
28±3N.m
3
Oil drain flange
-
4
Screw plug
-
5
Ring magnet
-
Park the machine on a solid and level ground.
Lower the arm rod and make the machine
retracted.
1) Close all the ball valves (if any) on the
hydraulic tank.
△
! Risk of part damage. Do not start
the engine when the ball valves of the
hydraulic tank are closed; otherwise
the parts will be damaged. If the ball
valves are closed, it is required to
remove the key from the key switch
and hang a warning sign on the
equipment.
△
! Risk of personal injury. Splashed
hot oil can penetrate and burn the skin.
2) Place a proper container under the hydraulic
tank.
3) Remove the oil drain plug from the hydraulic
tank.
4) Drain the hydraulic oil from the hydraulic
tank completely into a suitable container.
5) Remove the oil drain flange and the ring
magnet.
6) Remove the suction filter from the hydraulic
tank.
7) Flush the inside of the hydraulic tank with a
mild solvent. (Clean it with chemical
cleaning agent at first.After drying, flush
with clean hydraulic oil and drain the oil.)
8) Remove the foreign objects adsorbed by the
ring magnet.
9) Install a new suction filter.
10) Refit the ring magnet, oil drain flange and oil
drain plug.
11) Add the hydraulic oil to the hydraulic tank
until the oil level is at specified position of
the level gauge (refer to the section about
inspection of hydraulic oil level). Ensure that
the hydraulic oil doesn’t overflow.
12) Remove the possibly splashed hydraulic oil.
13) Open the ball valves on the hydraulic tank.
△
! Risk of part damage. After
installing the hydraulic tank, be sure to
open the two ball valves of the
hydraulic tank and inject oil to the
pump.
△
! CAUTION: When installing the
drain plug and filter, be sure to apply
pipe thread sealant.
14) Check all functions of the machine in a full
cycle, and check for oil leakage.
15) After a working cycle is finished, recheck the
oil level of the hydraulic tank, and add oil
until specified oil level is reached. Ensure
that the hydraulic oil doesn’t overflow.
Use temperature
Oil type