LGMG SC0407E User manual

Maintenance manual
SC0407E/SC0610E
Crawler Mobile Elevating Work Platform
△
! WARNING
Before operation and
maintenance, the operation and
maintenance personnel are
required to read and understand
this manual. Otherwise, fatal
accident may occur!
This manual shall be kept properly
for future reference by the
personnel concerned.
LINGONG HEAVY MACHINERY CO., LTD.

Crawler Mobile Elevating Work Platform
Maintenance manual
880*1230 mm Sextodecimo 8 sheets
Second edition, June 2022 First print, June 2022
LINGONG HEAVY MACHINERY CO., LTD.
Add.: 12F, Building 3, Lushang Olympic City, No. 9777, Jingshi Road, Lixia District, Jinan
City, Shandong Province, China
Tel.: [phone] Technical service hotline: [phone]
Fax: [phone] Parts sales hotline: [phone]
Website: www.lgmg.com.cn

Maintenance Manual of Crawler
Mobile Elevating Work Platform
I
Contents
Foreword ..................................................................................................... II
Safety Notices .............................................................................................IV
Chapter 1 Maintenance ................................................................................ 1
Chapter 2 Appendix ....................................................................................15
Chapter 3 Schematic Diagrams ..................................................................23

Maintenance Manual of Crawler
Mobile Elevating Work Platform
II
Foreword
Thanks for purchasing the lifting platform produced by Lingong Heavy Machinery Co., Ltd.
This machine is designed according to JIS B9690-2013-1.This manual introduces the mechanism and
drive, the operation and maintenance, the technical parameters and the maintenance & adjustment data
of the scissor lifting platform for safety guidelines and the correct operation and maintenance of the
machine.
How to get the best out of your machine is a goal we pursue together with you, and it depends to a large
extent on how familiar you are with the machine and how carefully and thoroughly it is maintained. We
sincerely hope that you will read through this manual before starting and operating the machine for the
first time and before repairing and maintaining the machine, and that you will master the operation and
maintenance described therein.
The illustrations and descriptions in this manual are correct at the time of publication, but due to the
continuous improvement of the structure and performance of our products, the design as well as
operation and maintenance instructions of the product may be subject to change without notice. For the
latest information of the machine or any question about this manual, please consult our service
department.
This manual applies to the scissor lifting platforms. Users should strictly follow the maintenance interval
in the maintenance schedule to maintain the machine.
This manual should always be kept at the specified location so that it can be read at any time. This
manual is an integral part of the machine and should be handed over when ownership or use of the
machine is transferred. If the manual is lost, damaged or illegible, please replace it promptly!
This manual is the property of Lingong Heavy Machinery Co., Ltd., and may not be duplicated or
reprinted without our written permission.
△
!WARNING
Only the personnel who have been professionally trained and qualified are
allowed to operate and maintain the machine.
Incorrect operation, maintenance and repair are dangerous and may lead to
personal injury or death.
Before operation or maintenance, please read this manual thoroughly.
Otherwise, do not operate, maintain or repair this machine.
Please load the machine in strict accordance with the rating, otherwise all the
consequences arising from overloading or unauthorized modification will be
borne by the user.
The operating procedures and precautions in this manual apply only to the
intended use of the machine. If the machine is used for an operation that is out
of the specification herein but not prohibited, always make sure that this
operation will not cause personal injury to yourself or others.
Please operate the machine in strict accordance with the safety requirements in

Maintenance Manual of Crawler
Mobile Elevating Work Platform
III
the manual. The user is responsible for all consequences caused by
non-compliance with the safety requirements of the machine.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
IV
Safety Notices
The operator shall understand and abide by the current national and local safety regulations. If such
regulations are not available, the safety instructions in this manual shall prevail.
Most accidents are caused by failure to obey operation and maintenance specifications of the machine.
To avoid unnecessary accident, please read and follow all warnings and precautions in this manual and
on the machine before operation or maintenance.
The safety measures are detailed in Chapter 1 “Safety”.
Considering the fact that not all possible hazards are foreseeable, it is impossible for safety notices in
this manual and on the machine to cover all safety precautions. If it is necessary to take steps and
operations not recommended herein, always ensure the safety of yourself and others, and keep the
machine from any damage. If the safety of some operations remains uncertain, please consult us or
dealers.
The operation and maintenance precautions referred to herein apply only to the intended use of this
machine. If the machine is to be used for other purposes than those listed herein, it is the user or
operator instead of us that shall take the safety liabilities therefrom.
In no case shall any operations expressively prohibited herein be performed.
For the purpose of this manual, the following signal words are applied to identify safety instructions:
△
!DANGER - Indicating any existing dangers that, if not avoided, will cause
serious injury or even death, and also serious machine damage.
△
!WARNING - Indicating any potential dangers that, if not avoided, may cause
death or serious injury, and also serious machine damage.
△
!CAUTION - Indicating situations that, if not avoided, may cause minor or
moderate injury, and also machine damage or shortened machine service life.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
1
Chapter 1 Maintenance

Maintenance Manual of Crawler
Mobile Elevating Work Platform
2

Maintenance Manual of Crawler
Mobile Elevating Work Platform
3
△
!WARNING: Observe the regulations
The operator can only perform the regular
maintenance items specified in this manual.
As required by the manufacturer, the
regular maintenance and inspection shall be
performed by the trained maintenance
technicians.
1.1 Checking the battery
Keeping the battery in good condition is crucial for
superior performance and safe operation.
Improper electrolyte level or damaged cable or
wiring may cause parts damage and hazards.
△
!CAUTION: If the machine is
equipped with the hermetically sealed
battery or maintenance-free battery,
inspection of electrolyte level is not
required. Otherwise, the electrolyte level
should be checked.
The SC0407E/SC0610E is equipped with
HOPPECKE maintenance-free battery, so
there is no need to check the electrolyte level.
△
!DANGER
Risk of electric shock:
Live-line working may result in serious
personal injury or even death. Be sure to
remove the ring, watch and other ornaments
before the work.
Risk of personal injury:
The battery electrolyte is corrosive. Avoid
touching the spilled electrolyte with hands or
other parts of the body so as to avoid injuries.
Use soda and water to neutralize the spilled
electrolyte.
△
!CAUTION: The following
inspections should be carried out with
sufficient battery power:
Wear protective clothes and goggles.
Ensure that the battery cable is
connected firmly, without corrosion.
Ensure that the battery lock lever is
stable.
△
! CAUTION: It is necessary to add the
terminal protector and corrosion-resistant
sealant to protect the battery terminals and
cables against corrosion.
1.2 Battery maintenance
schedule
The battery maintenance schedule is detailed in
the appendix.
1.3 Checking the hydraulic oil
level
The proper hydraulic oil level is essential for
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: This procedure shall be
performed when the platform is
retracted.
1) Visually check the oil level sight glass on the
side of the hydraulic tank.
Result: The hydraulic oil level should be at the
scale of the tank.
2) Add the oil as needed, and do not add too
much.
△
!CAUTION: Please add hydraulic oil
according to the operating environment
and temperature, as described below:

Maintenance Manual of Crawler
Mobile Elevating Work Platform
4
Inspection interval
Inspection Item
Daily or every 2 h
A
Monthly or every 25 h
A+B
Quarterly or every 50 h
A+B+C
Semiannually or every
100 h
A+B+C+D
Yearly or every 200 h
A+B+C+D+E
Biennially or every 400 h
A+B+C+D+E+F
Legend
Y=Yes
N=No
R = Repaired
Pass/fail
PDI report
Y
N
R
Operation
inspections
completed
Maintenance items
completed
Function tests
completed
Model
Serial number
Date
Owner
Inspection unit (printed)
Signature of inspector
Title of inspector
Inspection company
L-HM #32 anti-wear hydraulic oil Minimum
temperature＞0°C;
L-HV #32 low temperature hydraulic oil
-25°C＜minimum temperature≤0°C;
L-HS #32 ultra-low temperature hydraulic
oil -40℃＜minimum temperature≤-25°C;
#10 aviation hydraulic oilMinimum
temperature≤-40°C;
1.4 PDI report
1) PDI report covers all PDI items.
2) PDI report should be prepared for every PDI
item. Fill in the report and save it as required.
1.5 Maintenance schedule
The daily, quarterly, semiannually, yearly and
biennially inspection must be carried out as
scheduled. The product maintenance schedule
and PDI report are subdivided into five items: A, B,
C, D, E. The inspection steps are shown in the left
table.
△
!CAUTION:
Working hours shall prevail for the
maintenance cycle.
1.6 Maintenance inspection
report
1) Maintenance inspection report covers all
maintenance inspection items.
2) Maintenance inspection report should be
prepared for every maintenance inspection
item. After the inspection, the report should
be retained for at least 4 years, or as
specified by the employer, workplace and
government laws and regulations.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
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Legend
Y=Pass
N=Fail
R = Repaired
Checklist A
Y
N
R
A-1 Checking manuals and
labels
A-2 Pre-operation inspection
A-3 Function test
After 25 h
A-4 30-day maintenance
Checklist B
Y
N
R
B-1 Battery
B-2 Wires
B-3 Tires and hubs
B-4 Emergency stop
B-5 Key switch
B-6 Horn
B-7 Drive and brake
B-8 Drive speed in retraction
state
B-9 Drive speed in lifting state
B-10 Slow Drive
B-11 Check of hydraulic oil
B-12 Hydraulic tank exhaust
B-13 Chassis tray components
B-14 Test of inclination switch
B-15 Check of track tension
B- 16 Check of track integrity
Checklist C
Y
N
R
C-1 Platform overload system
C-2 Replacement of exhaust
cap of hydraulic tank
Checklist D
Y
N
R
D-1 check of scissor
wear-resistant slider
Checklist E
Y
N
R
E-1 Test or replacement of
hydraulic oil
1.7 PDI report
1.7.1 Basic principles
1) Dealers are obliged to complete PDI.
2) Priority should be given to PDI before each
product is delivered. PDI is to find out if there
are any obvious problems with the
equipment before it is put into use.
3) Damaged and modified equipment is never
allowed to be used. Once damage or
inconsistencies in equipment delivery are
found, the machine must be marked and
stopped immediately.
4) Equipment repairs must be performed by a
certified technician, in accordance with the
manufacturer's specifications and the
requirements in this manual.
1.7.2 Description
1) Refer to the Operating Manual on the
equipment.
2) PDI consists of operation inspections,
maintenance items and function tests.
3) Record the results in a table. Fill in the
appropriate table after each item is
completed according to the instructions in the
Operating Manual.
4) If the result of any inspection is "N", stop the
equipment, and conduct repair and recheck.
Afterwards, mark the R column.
1.8 Maintenance inspection
report

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Mobile Elevating Work Platform
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△
!CAUTION:
Record each inspection in a report.
Select the appropriate checklist
according to the inspection items.
Daily or every 2 h
A
Monthly or every 25
h
A+B
Quarterly or every
50 h
A+B+C
Semiannually or
every 100 h
A+B+C+D
Yearly or every 200
h
A+B+C+D+E
Biennially or every
400 h
A+B+C+D+E+F
Check the appropriate box after each
inspection.
Learn how to perform the inspection step
by step.
If the inspection result is "N", mark and
stop the equipment, and conduct repair
and recheck. After the repair, check the
“R” column. ①PDI ②Operation
inspections completed ③Maintenance
items completed ④Function tests
completed
1.9 Steps for checklist A
1.9.1 A-1 Checking manuals and labels
Keeping the operation and maintenance manuals
intact is the key to safe operation. Each
equipment is supplied with manuals, which are
stored in the box on the platform. Manuals with
faint handwriting or missing pages do not provide
enough information to ensure safe operation.
In addition, be sure that all safety labels are in
good condition. The labels warn the operator of
safety hazards associated with the use of the
machine. They also provide the user with
operation and maintenance information. Blurred
labels will not serve as a warning and may lead to
a hazardous operating environment.
1) Check that the operation and maintenance
manuals are in the box on the platform.
2) Check that the manuals are legible and
complete.
Result: The manuals match the model, and all
manuals are legible and complete.
Result: The manuals do not match the model, or
they are illegible or incomplete. Stop the machine
before manual replacement.
3) Check if the labels are illegible or damaged
against the label inspection chart carefully.
Result:All labels are complete, legible and intact.
Result: Some labels are missing, illegible or
damaged. Stop the machine before the label
replacement.
4) Put the manuals back to the original place
after use.
Tip: To replace the manuals or labels, please
contact LGMG.
1.9.2 A-2 Pre-operation inspection
Completing the pre-operation inspection is crucial
for safe operation of the machine. The
pre-operation inspection is completed by visual
inspection before the machine is operated. This
inspection is used to identify any obvious
problems with the machine prior to function test
and also to determine if routine maintenance
procedures should be performed.
The complete inspection procedure can be found
in the "Pre-operation Inspection" section of the
Manual.
1.9.3 A-3 Function test
Completing the function test is crucial for safe
operation of the machine. Function test is used to
find any functional defects in the machine before
it is put into operation. A defective machine
should not be used. As soon as a functional
defect is found, the machine should be marked
and stopped immediately.
The complete procedure can be found in the
"Function Test" section of the Manual.
1.9.4 A-4 30-day maintenance
The 30-day maintenance is a one-time
maintenance after the first 30 days or 25 hours of
machine operation. After this step,
proceed to the maintenance items on the

Maintenance Manual of Crawler
Mobile Elevating Work Platform
7
checklist.
1.10 Steps for checklist B
1.10.1 B-1 Checking battery
This inspection shall be performed once every 25
h or every month, whichever comes first.
Keeping the battery in good condition is crucial for
superior performance and safe operation of the
machine. Damaged cable or connector may
cause parts damage and hazards.
△
!WARNING: Risk of electric shock
Live-line working may result in serious
personal injury or even death. Be sure to
remove the ring, watch and other ornaments
before the work.
△
!WARNING: Risk of personal injury
The battery electrolyte is corrosive. Avoid
touching the spilled electrolyte with hands or
other parts of the body so as to avoid injuries.
Use soda and water to neutralize the spilled
electrolyte.
1) Wear protective clothes and goggles
properly.
2) Ensure that the battery cable connectors are
not corroded.
△
!CAUTION: Adding terminal
protectors or applying anti-corrosion
sealant may avoid corrosion of the
battery cable connectors.
3) Ensure that the battery and cables are fixed
securely.
4) Check whether the batteries in each battery
pack are properly connected.
5) Check the battery charger plug and wire
insulation for excessive wear and damage,
and replace them in time if necessary.
6) Connect the battery charger to AC power
supply of 100-240V, 45-65HZ correctly.
Result: The charger charges the battery.
Result: The audible alarm of the charger is
triggered and the indicator lamp flashes. Check
and correct the connection of fuse and charger.
Ensure that the charger works normally and
charges the battery.
△
!CAUTION:
For good effect, please select the wire of
appropriate length. The overall length of wire
shall not exceed 15 m.
To know more problems on charger operation,
please contact the after-sales service
department of LGMG.
1.10.2 B-2 Checking wires
This inspection shall be performed once every 25
h or every month, whichever comes first.
It is essential to keep the wires in good condition
to achieve safe operation and superior
performance of the machine. Failure to find and
replace the burned, scratched, corroded or bent
wires will lead to an unsafe operating
environment, causing damage to the machine
parts.
△
!DANGER: Risk of electric shock/
explosion
Thermal contact or live conductors may cause
serious personal injury or death. Do not wear
rings, watches or other ornaments.
1) Check if the ground wire under the chassis is
missing or damaged.
2) Check for burnt, scratched, corroded, bent or
loose wires in the followings areas:
GCU box
Hydraulic valve group
Battery area in the battery tray
PCU box
3) Turn the key switch to PCU position, and pull
up the red emergency stop buttons of GCU
and PCU.
4) Lift the platform to a certain height. The lifting
height of each model is shown in the table
below.
Model
Height (m)

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Mobile Elevating Work Platform
8
SC0407E
2.5
SC0610E
3.2
5) Move the safety arm to the middle of the
scissor bushing and rotate it downwards until
it is vertical.
6) Lower the platform until the safety arm is in
full contact with the bushing.
△
!DANGER: Risk of crushing
When lowering the platform, be sure to keep
the hands in the correct position of the safety
arm.
7) Check for burnt, scratched, corroded, bent or
loose wires in the chassis and scissor areas.
8) Check for burnt, scratched, corroded, bent or
loose wires in the following areas:
Scissor arm
 ECU to platform
 Harness connectors connected to the
platform
9) Check the free coating of insulating grease
applied to the following parts:
Harness connectors between ECU and PCU
Connectors of all harnesses of the level
sensor
△
!CAUTION: Do not apply excessive
insulating grease to harness connectors,
pins or sockets.
10) Lift the platform and return the safety arm to
the installation position.
11) After lowering the platform to the retraction
position, shut down the machine.
1.10.3 B-3 Checking track assembly
This inspection shall be performed once every 25
h or every month, whichever comes first.
Check the integrity of the track.
1.10.4 B-4 Checking emergency stop
function
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) Normal emergency stop function is crucial for
safe operation of the machine. If abnormal,
the red emergency stop button will not be
able to cut off the power supply and stop the
machine, causing hazards.
3) As a safety function, selecting and operating
the GCU take precedence over
the PCU except for the red emergency stop
button functions of the PCU.
①Turn the key switch to GCU position, and pull
out the red emergency stop buttons of GCU
and PCU.
②Set the red emergency stop button of GCU to
“OFF” position.
Result: The machine does not work.
4) Set the red emergency stop button of PCU to
“OFF” position.
Result: The machine does not work.
△
!CAUTION: All operations of the
machine can be stopped by the red
emergency stop button of GCU, even
though the key switch is set to PCU
position.
1.10.5 B-5 Testing key switch
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) Normal key switch is crucial for safe
operation of the machine. The machine may
be operated by the GCU or PCU, which is
switched through the key switch. Failure of
the switch may cause hazards.
3) When performing such steps, ensure to
stand on the ground rather than on the
platform while using the PCU.
①Pull out the red emergency stop buttons of
GCU and PCU.
②Turn the key switch to PCU position.
③Check the lifting and lowering function of the
GCU.
Result: The machine does not work.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
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④Turn the key switch to GCU position.
⑤Check the lifting and lowering function of the
PCU.
Result: The machine does not work.
⑥Turn the key switch to “OFF” position.
Result: The machine does not work.
1.10.6 B-6 Testing horn
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) The horn is used by the platform personnel to
warn the ground personnel. Abnormal horn
cannot warn the ground personnel of
hazards or unsafe conditions.
①Turn the key switch to PCU position, and pull
up the red emergency stop buttons of GCU
and PCU.
②Press the horn button in the horn controller.
Result: The horn sounds.
1.10.7 B-7 Testing drive and brake
function
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) Correct braking is crucial for safe operation.
Steady braking without delay, jolt or
abnormal noise is required.
3) The braking function test must be carried out
with the machine placed on a solid, level and
unobstructed ground and in retraction state
(with extended platform also retracted
completely).
①Draw a reference test line on the ground.
②Turn the key switch to PCU position, and pull
up the red emergency stop buttons of GCU
and PCU.
③Lower the platform to the retraction position.
④Press the driving function selector button.
⑤Take one point (such as the contact point
between the wheel and the ground) on the
machine as the mark for visual inspection of
misalignment with the reference test line.
⑥Run the machine at the highest speed, and
release the joystick immediately when the
reference point goes beyond the reference
test line on the ground.
⑦Measure the distance between the reference
point and the reference test line.
Result: The machine stops within the specified
braking distance. No action is required.
Result: The machine doesn't stop within the
specified braking distance.
△
!CAUTION:
The brake must be effective within the
permissible gradeability range of the machine.
Replace the brake and repeat the above
process starting from step 1.
1.10.8 B-8 Testing drive speed in
retraction state
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) Normal drive function is crucial for safe
operation. The drive function shall enable the
machine to respond to the operator quickly
and steadily. No delay, jolt or abnormal noise
shall occur during normal operation and
traveling.
3) The drive test must be carried out with the
machine placed on a solid, level and
unobstructed ground.
①Draw two lines 10 m spaced apart on the
ground, which are taken as the starting and
termination lines respectively.
②Turn the key switch to PCU position, and pull
up the red emergency stop buttons of GCU
and PCU.
③Lower the platform to the retraction position.
④Press the drive function selection button.
⑤Take one point on the machine as the
reference mark for visual inspection of
misalignment with the starting and
termination lines.
⑥Run the machine at the highest speed and
start timing when the reference point goes

Maintenance Manual of Crawler
Mobile Elevating Work Platform
10
beyond the starting line.
⑦Keep running the machine at the highest
speed and record the time when the
reference point goes beyond the finishing
line. See the specifications.
1.10.9 B-9 Testing drive speed in lifting
state
△
!CAUTION: When the machine is in
the lifting state, the walking speed shall
be 0 km/h.
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
1.10.10 B-10 Testing drive speed at slow
speed
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) Normal drive function is crucial for safe
operation. The drive function shall enable the
machine to respond to the operator quickly
and steadily. No delay, jolt or abnormal noise
shall occur during normal operation and
traveling.
3) The drive test must be carried out with the
machine placed on a solid, level and
unobstructed ground.
①Draw two lines 10 m spaced apart on the
ground, which are taken as the starting and
termination lines respectively.
②Turn the key switch to PCU position, and pull
up the red emergency stop buttons of GCU
and PCU.
③Lower the platform to the retraction position.
④Press the drive speed selection button.
⑤Take one point (such as the contact point
between the wheel and the ground) on the
machine as the reference mark for visual
inspection of misalignment with the starting
and termination lines.
⑥Run the machine at the highest speed and
start timing when the reference point goes
beyond the starting line.
⑦Keep running the machine at the highest
speed and record the time when the
reference point goes beyond the finishing
line. The time shall not be less than the
specified time.
1.10.11 B-11 Checking hydraulic oil
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
Collect a sample of hydraulic oil and place it in a
transparent container. Visual inspection of the
hydraulic oil is performed as follows:
Color: The oil should be clear and light honey
in color.
Appearance: The oil should be clear, not
cloudy and free of particles, foreign matter or
other contaminants.
Hydraulic oil can be checked by smell ("hot"
but not "burnt") or by rubbing between fingers
(a feeling of stickiness without any
roughness of particles). If the hydraulic oil
passes all of the above inspections, proceed
to maintenance as scheduled. In case of
failure in any of the above inspections, the
hydraulic oil must be checked or changed.
2) Changing or testing hydraulic oil is crucial for
superior performance and service life of the
machine. Contaminated hydraulic oil may
affect the machine performance and if not
changed, will cause damage to the machine.
Frequent inspection shall be carried out in a
harsh working environment.
3) Before oil change, the oil separator can be
used to test if oil change is necessary.
4) If the hydraulic oil has not been changed for
two years, it should be tested quarterly and
changed if it fails the test.
5) Note: when replacing the hydraulic oil, it is
recommended to replace all hydraulic filters
at the same time.
6) Refer to E-1 testing or changing the hydraulic
oil.
1.10.12 B-12 Checking ventilation
system of hydraulic tank cover (if
equipped)
1) This inspection shall be performed once
every 25 h or every month, whichever comes

Maintenance Manual of Crawler
Mobile Elevating Work Platform
11
first.
2) It is essential to keep the hydraulic tank vent
cap ventilated to achieve superior
mechanical performance and long service life.
If the vent cap is dirty or clogged, the
performance of the machine may be
deteriorated. Frequent inspection shall be
carried out in a harsh working environment.
3) Remove the hydraulic tank vent cap.
4) Carefully clean the hydraulic tank vent cap
with mild solvent and dry it with low-pressure
compressed air.
Install the hydraulic tank vent cap.
1.10.13 B-13 Checking chassis tray lock
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) The chassis tray lock in good condition is
crucial for superior performance and service
life of the machine. A damaged chassis tray
lock may cause unwanted open of the tray
and result in potential safety hazards. Check
each chassis tray lock for wear and damage.
1.10.14 B-14 Checking inclination switch
1) This inspection shall be performed once
every 25 h or every month, whichever comes
first.
2) The inclination switch in good condition is
critical to machine performance and safe
operation. Operating defective limit switch
will cause deterioration of the machine
performance and lead to potentially unsafe
working environments.
3) The check must be carried out with the
machine placed on a solid, level and
unobstructed ground.
4) Move the machine onto the slope with the
maximum allowable inclination. See the
nameplate for the maximum allowable
inclination angle.
5) Press the lifting function selection button to
lift to a certain height on the inclined ground.
Result: The diagnostic display shows the code LL,
the alarm sounds, machine function is normal.
Result: The diagnostic display doesn't show code
LL, the alarm sounds. Check or replace the
inclination switch.
6) Press the drive function selection button and
try to drive the machine on the slope.
Result: The diagnostic display shows code LL,
the alarm sounds, and the turn and driving
function cannot work. Machine function is normal.
Result: The diagnostic display does not show
code LL, there is no alarm sound, and the drive
and turn functions operate normally. Check or
replace the inclination switch.
1.10.15 B-15 Checking track tension
Pay attention to the tension of the rubber
track
1. Basically, it shall be adjusted according to the
tension of rubber track specified for the
machine;
2. The track tolerance of SC0407E shall be
10-15 mm.
The track tolerance of SC0610E shall be
10-20 mm.
Check of tension of rubber track:
1. Lift the machine off the ground properly to
allow the rubber track to sag freely.
2. Measure the distance tolerance between the
lower tangent line of the middle track roller
and the rubber track, as shown below:
3. Adjust the tension through the track
tensioner bolt to ensure that the track is not
loose.
Adjustment of track tension
Tensioning track:
1) Loosen nut 3 outwards, adjust bolt 1 inwards,
and tighten nut 2 and nut 3.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
12
1. Bolt
2. Nut
3. Nut
2) Move the machine forward and backward to
check the tension.
Check the tension again. If it is not correct, adjust
again.
The tensions of the tracks on both sides shall be
consistent.
1.10.16 B-16 Checking track integrity
△
!CAUTION: If one of the following
damages is found, contact an
authorized service station for
replacement of track.
I) Wire rope rupture
Possible cause:
•Excessive tension.
II) Wear and cracking of the metal core
Possible cause:
•Excessive tension
•Tooth wear of traction gear
•Interference of sand, stone, etc.
III) Separation of the metal core
Possible cause:
•Excessive tension
•Tooth wear of traction gear
•Interference of sand, stone, etc.
IV) Cracks
Even if cracks are found on the rubber surface,
the track can still be used. However, it is
recommended that these cracks be inspected
frequently as they may lead to the metal core
being exposed.
V) Wear
Track can continue to be used even if severe
wear is found on the engraved surface. Pay
special attention when moving on inclined or
smooth surfaces, as Track adhesion may be
impaired.

Maintenance Manual of Crawler
Mobile Elevating Work Platform
13
1.11 Steps for checklist C
1.11.1 C-1 Testing platform overload
system
1) Perform this step every 50 hours or quarterly,
whichever comes first. In case of overload of
the machine, inspection and recalibration
should be conducted immediately.
2) Frequent test of the platform overload
mechanism is crucial for safe operation of the
machine. Continued incorrect operation of
the platform will cause failure of the system
to sense the platform overload information
and affect the machine stability, leading to
rollover of the machine.
3) The platform overload system is designed to
prevent the machine from operating under
overload. It is composed of two electrical
components, namely, an overload pressure
sensor and a corner sensor.
4) Evenly place heavy objects slightly larger
than the rated load on the platform.
5) Lift the platform to a certain height.
Result: The alarm sounds and the LED displays
OL.
Result: No alarm sounds. Calibrate the platform
overload system.
6) Remove some heavy objects and lower the
platform.
1.11.2 C-2 Replacing vent cap of
hydraulic tank (If equipped)
1) Perform this step every 50 hours or quarterly,
whichever comes first.
2) The Hydraulic tank is a ventilated oil tank.
There is an air filter inside the vent cap,
which may become clogged over time. In
case of vent cap failure or improper
installation, the components may be
damaged if impurities enter the hydraulic
system. The vent cap shall be checked more
frequently in harsh working environment.
①Remove the vent cap of the hydraulic tank.
②Replace with a new vent cap of hydraulic
tank.
1.12 Steps for checklist D
1.12.1 D-1 Checking wear-resistant
slider of scissor arm
1) Perform this step every 100 hours or 6
months, whichever comes first.
2) The quality of wear-resistant slider of scissor
arm is critical to the safe operation of the
machine. Worn sliders may lead to
component damage and safety hazards.
1. Steel pipe of inner connecting rod
2. Wear-resistant slider
3. Base plate
3) Check the wear washer when the platform is
folded.
①Measure the distance from the steel pipe of
inner connecting rod to the plane of base
plate.
Result:
a) The measurement result of SC0407E is
greater than or equal to 24 mm. Carry out
Step 2;
The measurement result of SC0610E is
greater than or equal to 24 mm. Carry out
Step 2;
Result:
b) The measurement result of SC0407E is less
than 24 mm. Replace the wear-resistant
slider.
The measurement result of SC0610E is less than
1
3
2

Maintenance Manual of Crawler
Mobile Elevating Work Platform
14
24 mm. Replace the wear-resistant slider.
○
2Apply lubricant between the chassis slide
rail and the wear-resistant slider.
1.13 Steps for checklist E
1.13.1 E-1 Testing or changing the
hydraulic oil
1) This procedure shall be performed every 200
h or every year, whichever comes first.
2) Changing or testing hydraulic oil is crucial for
superior performance and service life of the
machine. Contaminated hydraulic oil and
return filter may affect the machine
performance and if not changed, will cause
damage to the parts. The oil level should be
checked frequently in harsh operating
conditions.
3) Before oil change, use the oil separator to
test if oil change is necessary.
4) If the hydraulic oil has not been changed in
two years, it shall be checked on a quarterly
basis and changed in case of failure to pass
the check.
△
!CAUTION: This item should be
performed with the machine retracted.
①Open the door lock.
②Pull out the mounting tray of hydraulic power
unit.
③Mark and disconnect the return pipe of power
unit, and remove the pipe from the power unit.
Cover the Pipe joint to prevent dust.
④Mark and disconnect the suction pipe of the
power unit and remove the pipe. Cover the
pipe joint to prevent dust.
⑤Release the hydraulic tank fastener and take
out the hydraulic tank.
⑥Unscrew the hydraulic oil filler cap and pour
the oil into a suitable container.
△
!WARNING: the splashed
hydraulic oil may penetrate the skin.
When releasing the hydraulic connector,
the speed should be very slow, so that
the oil pressure gradually decreases. Do
not let the oil spray out.
⑦Remove the spilled hydraulic oil and properly
use the released hydraulic oil.
⑧Clean the hydraulic tank with a mild solvent
and air-dry it thoroughly.
5) Connect the suction pipe to the power unit.
6) Connect the return pipe to the power unit.
7) Add a proper amount of hydraulic oil to the
hydraulic tank and be careful not to overflow.
And then tighten the filler cap.
8) Reinstall the hydraulic tank and install and
tighten the fastener of the hydraulic tank.
Start the oil pump to fill the entire hydraulic
system with hydraulic oil to remove the air
from the hydraulic system.
△
!WARNING: Operating the machine
without oil may cause damage to the
hydraulic pump. Take care to bleed the
tank when adding oil to the hydraulic
system. Cavitation is not allowed in the
hydraulic pump.