Komatsu D475A-5E0 Operation & Maintenance Manual page 239

TROUBLESHOOTING
CHASSIS
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem
Torque converter oil pressure
does not rise
Torque converter overheats
Torque converter oil
temperature gauge does not
work
Lacks drawbar pull
Machine does not move when
the joystick (steering,
directional
gear shift lever) is placed
in FORWARD
Machine does not turn when
steering is operated
Machine does not stop when
brake pedal is depressed
Track comes off
3 - 186
Main causes
Improper tightening of oil pipe or
pipe joint, air leaking in because of
damage, oil leakage
Wear, gouging of gear pump
Lack of oil in transmission case
Clogged oil filter element strainer in
transmission case
Clogged radiator
Fan rotation speed is slow
Engine coolant temperature too high
Clogged oil cooler
Oil pressure too low
Low circulation of oil due to worn
gear pump
Defective oil temperature gauge
Defective connection of wiring
Lack of engine horsepower
Torque converter oil pressure too
low
Steering clutch slipping
Lack of oil in the steering clutch
case
Oil pressure in transmission does
not rise
Steering clutch slipping
Wear, gouging of gear pump
Clogged oil strainer element in
steering clutch case
Defective wiring of the joystick
(steering, directional gear shift lever)
Parking brake is at LOCK
Brake is not applied on side which
is pulled
Defective wiring of the joystick
(steering, directional and gear shift
lever)
Defective brake adjustment
Defective brake pedal wiring
Track shoe assembly too loose
Remedy
Inspect, repair
( Check, replace)
Add oil to specified level. See
Checks before starting
Clean. See EVERY 500 HOURS
SERVICE
Clean, wash radiator core
( Check and repair hydraulic
circuit of fan motor)
See Engine Related
( Clean or replace)
See Torque converter oil
pressure does not rise
( Replace gear pump)
( Replace oil temperature gauge)
( Check, repair)
See Engine Related
See Torque converter oil
pressure does not rise
( Inspect, repair)
Add oil to specified level. See
Checks before starting
See Torque converter oil
pressure does not rise
( Check, repair)
Clean. See EVERY 1000
HOURS SERVICE
Check wiring
Set parking brake to FREE
position
( Adjust linkage, Check brake
pressure)
( Check wiring)
( Adjust linkage, adjust brake
pressure)
( Check wiring)
Adjust track tension. See WHEN
REQUIRED
OPERATION