Komatsu WA200-8 Operation & Maintenance Manual page 288

TROUBLES AND ACTIONS
Problem
HST
Engine runs but machine does not
move.
Machine moves slowly and lacks
power even with engine running at
full throttle.
Oil is overheated.
Noise is generated.
Axle
Noise is generated.
Brake
Brake does not work even when ped-
al is depressed.
Brake drags or remains applied.
Brake squeals.
Steering
Steering wheel is heavy to operate.
3-224
Main causes
Parking brake is applied.
Directional lever is not shifted in posi-
tion completely.
There is no electric current in the di-
rectional lever.
Lack of oil in the hydraulic tank
Lack of oil in the hydraulic tank
Hydraulic oil temperature is low.
Insufficient or excessive oil in the hy-
draulic tank
Oil cooler core is clogged
Lack of oil in the transfer case
Lack of oil
Improper oil is used (for machines
with limited slip differential)
Disc has worn to wear limit.
Lack of oil in the hydraulic tank
Air is in brake system.
Vent hole of brake valve is clogged.
Incorrect adjustment of brake pedal
linkage
Disc has worn.
Large amount of water is mixed into
axle oil
Axle oil is deteriorated due to over-
use of the brake.
Lack of oil in the hydraulic tank
Remedy
Release the parking brake.
Shift the lever completely in position.
Check the fuse and wiring harness
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Perform warm-up operation.
Add oil to the specified level or drain
oil to the specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Clean the oil cooler core.
Add oil to the specified level by refer-
ring to WHEN REQUIRED.
Add oil to the specified level by refer-
ring to WHEN REQUIRED.
Change the oil to the appropriate oil.
Replace the disc. (*)
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Bleed air (*)
Clean it.
Check, repair. (*)
Replace the disc. (*)
Change the axle oil.
Change the axle oil.
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
OPERATION