Komatsu WA380-8 Operation & Maintenance Manual page 317

OPERATION
Problem
Machine moves slowly and lacks
power even with engine running at
full throttle.
Oil overheats.
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.
Steering wheel is jolting.
Parking brake
Braking effect is poor.
Brake drags or remains applied.
Hydraulic system
Power lacks when raising the bucket.
It takes time to raise the bucket.
Main causes
Lack of oil in transmission case
Clogged screen
Lack or excess oil in transmission
case
Traveling in incorrect speed range
Too long torque converter stall opera-
tion
Engine overheating
Lack of oil in transmission case
Lack of oil
Improper oil used (for machines with
limited slip differential)
Disc has worn to wear limit.
Hydraulic oil in the hydraulic tank is
insufficient.
Air is in brake system.
Vent hole of brake valve is clogged.
Disc has worn.
Large amount of water is in axle oil
Axle oil is deteriorated due to over-
use of brake.
Hydraulic oil in the hydraulic tank is
insufficient.
Play in steering cylinder pin
Hydraulic oil in the hydraulic tank is
insufficient.
Disc has worn.
Lack of oil in transmission case
Clogged screen
Hydraulic oil in the hydraulic tank is
insufficient.
Hydraulic tank filter is clogged.
TROUBLES AND ACTIONS
Remedy
Add specified capacity of oil. See
WHEN REQUIRED.
Disassemble and clean. (*)
Add oil to specified level or drain ex-
cessive oil .See Maintenance when
required.
Use correct speed range.
Reduce stall time.
Check engine. (*)
Add specified capacity of oil. See
WHEN REQUIRED.
Add specified capacity of oil. See
WHEN REQUIRED.
Change the oil to the specified oil.
Replace disc. (*)
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
Bleed air (*)
Clean.
Replace disc. (*)
Change the axle oil.
Change the axle oil.
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
Lubricate the bearing.
Change the pins and bushings. (*)
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
Replace disc. (*)
Add specified capacity of oil. See
WHEN REQUIRED.
Disassemble and clean. (*)
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
Replace the filter. See Every "EVERY
2000 HOURS MAINTENANCE".
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