TROUBLESHOOTING OPERATION
3-144
CHASSIS 3
q ( ): Always contact your Komatsu distributor when dealing with these items.
q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Oil pressure in torque converter fails
to rise
•Improper tightening of oil pipe, pipe
joint, air leaking in or oil leaking out
because of damage
•Wear, scuffing of gear pump
•Insufficient oil in power train case
•Clogged oil filter element strainer in
power train case
•Check, repair
(•Check, replace)
•Add oil to the specified level. For
details, see CHECK BEFORE
STARTING
•Clean. For details, see EVERY 500
HOURS SERVICE
Torque converter is overheated
•Clogged radiator
•Engine coolant temperature is high
•Clogged oil cooler
•Oil pressure too low
•Lack of flow of lubricant caused by
wear of power train gear pump
•Clean radiator core
•See ENGINE related parts
(•Clean or repalce)
•Go to “Oil pressure in torque con-
verter fails to rise“
(•Replace gear pump)
Torque converter oil temperature
gauge does not work
•Defective oil temperature gauge
•Defective contact in wiring connec-
tion
(•Replace oil temperature gauge)
(•Check, repair)
Lacks drawbar pull (machine does
not pick up speed)
•Lack of engine horsepower
•Oil pressure in torque converter is
too low
•See ENGINE related parts
•Go to “ Oil pressure in torque con-
verter fails to rise“
Machine will not move when steer-
ing, forward-reverse, gear shift lever
is placed in FORWARD
•Insufficient oil in power train case
•Transmission oil pressure does not
rise
•Defective Brake
•Defective lever wiring
•Parking brake lever is in LOCK
position
•Add oil to specified level. For
details, see CHECK BEFORE
STARTING
•Go to oil pressure in torque con-
verter fails to rise
(•Adjust linkage)
(•Check, repair)
•Set to FREE position
Does not steer even when steering
is operated
•Defective lever wiring
•Abnormal HSS pump
•Abnormal HSS motor
(•Check, repair)
(•Check, replace)
(•Check, replace)
Machine doesn't stop when brake
pedal are depressed
•Defective brake adjustment (•Adjust linkage)
(•Check brake pressure)
Track comes off
•Track is too loose •Adjust track tension. For details,
see WHEN REQUIRED
Sprocket develops abnormal wear
•Track is too loose or too tight •Adjust track tension. For details,
see WHEN REQUIRED
Machine does not travel in straight
line
•Defective adjustment of HSS con-
troller
•Abnormal HSS pump
(•Adjust)
(•Replace)
Blade rises too slowly or does not
rise at all
(or blade tilts too slowly)
•Lack of hydraulic oil
•Defective hydraulic pump
•Work equipment lock lever is in
LOCK position
•Add oil to specified level. For
details, see EVERY 250 HOURS
SERVICE
•Check
•Set to FREE position
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