Komatsu WA500-6H, Operation & Maintenance Manual, Page: 252 / 412

3.7 Troubleshooting Operation
3-186
WA500-6H – VEAM430100
Steering wheel is loose
z Play in steering cylinder pin
z Defective hydraulik system
z Lack of oil
z
Grease bearing or replace pin
and bushing where there is play
z
(Check, repair)
z
Add oil to specified level.
See EVERY 100 HOURS SER-
VICE
Parking brake
Brake does not work well z Disc is worn z (Replace disc)
Brake drags or remains applied
z
Lack of oil in transmission case
z
Screen is clogged
z Add or drain oil to specified level.
See WHEN REQUIRED
z
(Disassemble, clean)
Hydraulic system
Bucket lacks lifting power
Bucket takes time to go up
z
Lack of oil
z
Clogged hydraulic filter
z
Add oil to specified level.
See EVERY 100 HOURS SER-
VICE
z
Replace cartridge.
See EVERY 2000 HOURS SER-
VICE
Excessive bubbles in oil
z Low quality oil being used
z Oil level is low
z Air entering oil line
z
Replace with good quality oil
z
Add oil to specified level.
See EVERY 100 HOURS SER-
VICE
z
Bleed air.
See WHEN REQUIRED
Hydraulic pressure is low
z
Oil level is low and pump is suck-
ing in air.
z Add oil to specified level.
See EVERY 100 HOURS SER-
VICE
z
Bleed air.
See WHEN REQUIRED
Irregular movement of cylinder z Oil level is low
z
Add oil to specified level.
See EVERY 100 HOURS SER-
VICE
Problem Main causes Remedy