Komatsu D155A-6 Operation & Maintenance Manual page 235

TROUBLESHOOTING
CHASSIS
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Machine does not stop even when
brake pedal is depressed
Track shoe comes off
Abnormal wear of sprocket
Blade, ripper lifting speed too slow
or blade, ripper does not go up
Swing is operated but upper
structure does not swing
Transmission oil pressure does not
rise
Lack of traction (machine travel
speed is low)
Machine takes time to reach travel
speed
Even when steering, directional,
and gear shift lever is set to travel
position, machine does not move off
Machine does not travel in straight
line
Torque converter overheats (red
range at top of power train oil
temperature gauge lights up)
3 - 184
Main causes
Defective brake adjustment, low
oil pressure
Track shoe too loose
Track shoe too loose or too tight
Lack of hydraulic oil
Work equipment lock lever at
LOCK position
Parking brake lever at LOCK
position
Defective wiring of lever
Abnormality in steering valve
(ECMV)
Gear pump worn or scuffing
Lack of oil in power train case
Clogged oil filter element,
strainer in power train case
Lack of engine power
Power train oil temperature is low
Lack of engine power
Lack of oil in power train case
Transmission oil pressure does
not rise
Parking brake lever at LOCK
position
Defective adjustment of power
train controller
Abnormality in steering valve
Lack of oil in power train case
Transmission oil pressure does
not rise
Excessive load during operation
Remedy
( Adjust, check, repair)
Adjust track tension. See WHEN
REQUIRED
Add oil to specified level. See
EVERY 250 HOURS SERVICE
Set to FREE position
Set to FREE position
( Check, repair)
( Check, replace)
( Check, or replace)
Add oil to specified level. See
Check before Starting
Clean. See EVERY 1000
HOURS SERVICE
See ENGINE
Carry out warming-up operation
See ENGINE
Add oil to specified level. See
Check before Starting
See "Transmission oil pressure
does not rise" above"
Set to FREE position
( Adjust)
( Check, replace)
Add oil to specified level. See
Check before Starting
See "Transmission oil pressure
does not rise" above
Use transmission speed range
one level lower or lighten load
and increase speed during
operation
OPERATION