Komatsu PC138USLC Operation & Maintenance Manual page 257

TROUBLES AND ACTIONS
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
Speed of travel, swing, boom, arm,
bucket is slow
Pump generates abnormal noise
(sucking in air)
Excessive rise in hydraulic oil
temperature
Track comes off
Abnormal wear of sprocket
Boom rises slowly, does not rise
Does not swing
3 - 202
Main causes
Lack of hydraulic oil
Clogged element in hydraulic
tank strainer, lack of oil
Loose fan belt
Dirty oil cooler
Lack of hydraulic oil
Track too loose
Lack of hydraulic oil
Swing lock switch still applied
Remedy
Add oil to specified level, see
CHECK BEFORE STARTING
Clean, see EVERY 2000
HOURS SERVICE
( Check fan belt tension, replace)
Clean, see EVERY 500 HOURS
SERVICE
Add oil to specified level, see
CHECK BEFORE STARTING
Adjust track tension, see WHEN
REQUIRED
Add oil to specified level,
CHECK BEFORE STARTING
Turn swing lock switch OFF
OPERATION