TROUBLESHOOTING OPERATION
3-118
CHASSIS 3
q ( ): Always contact your Komatsu distributor when dealing with these items.
q In cases of abnormalities or causes which are not listed below, please contact your Komatsu distributor for
repairs.
Problem Main causes Remedy
HST
Engine is running but machine
does not move
•Parking brake is applied
•Directional lever is not shifted prop-
erly
•No electricity is flowing to directional
lever (electrical type)
•Lack of oil in hydraulic tank
•Release parking brake
•Shift lever properly
•Check fuse and wiring harness
connector
•Add oil to specified level. See
EVERY 100 HOURS
Even when engine is run at full
throttle, machine only moves
slowly and lacks power
•Lack of oil in hydraulic tank
•Hydraulic oil temperature is low
•Add oil to specified level. See
EVERY 100 HOURS
•Carry out warming-up operation
Oil overheats •Too much oil or too little oil
•Clogged oil cooler core
•Add or drain oil to specified level.
See EVERY 100 HOURS
•Clean oil cooler core
Noise generated •Lack of transfer oil •Add oil to specified level. See
WHEN REQUIRED
Axle
Noise generated •Lack of oil
•Improper oil used (for machines with
limited-slip differential)
•Add oil to specified level. See
WHEN REQUIRED
•Change to specified oil
Brake
Brake is not applied when pedal is
depressed
•Disc has reached wear limit
•Defective hydraulic system
· Lack of oil
· Air in brake line
(•Replace disc)
•Add oil to specified level. See
EVERY 100 HOURS
•Bleed air. See WHEN
REQUIRED
Brake drags or not applied
•Defective adjustment of brake pedal
linkage
•Vent hole of brake valve is clogged
(•Check, repair)
(•Replace)
•Clean
Brakes squeal •Disc is worn
•Large amount of water in axle oil
•Deteriorated axle oil due to over-use
of brake
(•Replace disc)
•Change axle oil
•Change axle oil
Parking brake
Poor braking effect •Linkage is loose
•Disc is worn
•Adjust
(•Replace disc)
Steering
Steering wheel is heavy
•Defective hydraulic system
•Lack of oil
•Add oil to specified level. See
EVERY 100 HOURS
There is play in steering wheel •Steering cylinder pin is loose
•Defective hydraulic system
· Lack of oil
•Grease bearing. Or replace pin
and bushing where there is play
•Add oil to specified level. See
EVERY 100 HOURS
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