Operation & Maintenance Manual
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LG918 Wheel Loader
87
2
Shifting
pressure of a
certain gear is
low
1
Damaged piston seal ring of this gear
2
Damaged gasket in the oil lines of this
gear
3
Oil leakage in the oil lines of this gear
1
Change the seal ring
2
Change the gasket
3
Check and remove the leakage
3
The oil of
torque converter
overheats
1
Low oil level in gearbox oil tank
2
High oil level in gearbox oil tank
3
Low shifting pressure and clutch slips
4
T/Q radiator is clogged
5
T/Q operates with high load for a
continuous long time
6
Radiator is not good
1
Add oil to the specified level
2
Drain oil to the specified level
3
Refer the problems 1 and 2
4
Clean or replace the radiator
5
Shut down for cooling
4
Machine can not
move when
engine runs in
high speed
1
Cut-off valve spool of transmission
control valve can’t reset
2
Shift no gear
3
Spring of pressure-regulator valve in
transmission valve is broken
4
Same as 1, 2, 3 and 4 of problem 1
1
Disassemble the cut-off valve, find
out the reasons that spool can’t reset
and remedy
2
Shift gear again or readjust the
gearshift control levers and linkages
3
Change the spring of
pressure-regulator valve
4
Refer to 1, 2, 3 and 4 of problem 1
5
Insufficient
driving force
1
Low shifting pressure
2
High oil temperature of T/Q
3
Damaged T/Q blades
4
Damaged overrunning clutch
5
Insufficient driving force of engine
1
Refer to problems 1 and 2
2
Refer to problems 3
3
Disassemble and check the torque
converter; change blades
4
Disassemble and check free-wheel
clutch, change damage parts
5
Check and maintain the engine
3.8.3 Brake System
No.
Problems
Possible Causes
Remedy
1
Insufficient
brake force
1
Oil leakage of pliers pump
2
Air in brake hydraulic lines
3
Low brake air pressure
4
Over worn leather cup of booster pump
5
Oil leakage from hub to brake plates
6
Worn brake plates
1
Change rectangular sealing ring of
pump
2
Bleed the air out
3
Check the sealing performance of
air compressor, control valve,
storage tank and lines.
4
Change the leather cup
5
Check or replace the seal of hub
6
Change brake plates
2
Failure to release
the brake
normally
1
Wrong position of brake valve spool,
locked piston rod, damaged or faulty
reset spring
2
Improper operation of booster
3
Pliers piston can’t reset
1
Refer to problem 2
2
Check the booster pump
3
Check or replace the rectangular
seal ring
