Komatsu PC18MR-3, Operation & Maintenance Manual

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TROUBLESHOOTING
188 WEAM012101
3.7.6.2 FRAME
3.7.6.3 ENGINE
TROUBLE CAUSE SOLUTION
Travel speed, swing, boom, arm,
bucket slow.
• No hydraulic oil. • Restore level. See "CHECKS TO BE
CARRIED OUT BEFORE START-
ING THE ENGINE".
Pump does not work correctly.
• Foreign body in the hydraulic tank fil-
ter.
• Clean. See "Every 2000 hours OF
OPERATION".
Hydraulic oil temperature increases
excessively.
• No hydraulic oil.
• Fan belt slack.
• Radiator or exchanger fins clogged.
• Restore level. See "CHECKS TO BE
CARRIED OUT BEFORE START-
ING THE ENGINE".
• Adjust fan belt tension. See "Every
500 hours OF OPERATION".
• Clean or repair. For details, see
“EVERY 500 HOURS OF OPERA-
TION”
Tracks come off.
• Slack tracks. • Adjust the track tension, see “WHEN
REQUIRED”.
Sprocket excessively worn.
TROUBLE CAUSE SOLUTION
The engine oil pressure warning light
blinks (and the acoustic alarm sounds
at the same time).
• Oil level in oil pan too low (air
sucked in).
• Oil filter clogged.
• Oil leakage due to damage or incor-
rect tightening of oil pipes or joints.
• Engine oil pressure sensor faulty.
• Restore level. See "CHECKS TO BE
CARRIED OUT BEFORE START-
ING THE ENGINE".
• Replace cartridge. See "Every 500
hours OF OPERATION".
(•) Check and repair.
(•) Change.
Steam comes out of radiator top (pres-
sure valve). • Fluid level low, fluid leakages.
• Fan belt slack.
• Mud or limestone accumulated in
cooling system.
• Radiator fins damaged or closed.
• Faulty thermostat.
• Radiator cap loose
(work at considerable heights).
• Fluid level sensor faulty.
• Add fluid, repair. See "CHECKS TO
BE CARRIED OUT BEFORE
STARTING THE ENGINE".
• Adjust fan belt tension. See "Every
500 hours OF OPERATION".
• Change the fluid and clean the cool-
ing system, see “WHEN RE-
QUIRED”.
• Clean or repair, see “EVERY 500
HOURS OF OPERATION”.
(•) Change.
• Tighten cap or change unit.
(•) Change.
The engine water temperature indica-
tor has reached the red overheating
area (warning light blinks and acoustic
alarm sounds at the same time)
Even if the engine runs for a long time,
the engine water temperature indicator
does not reach the correct range. • Faulty thermostat.
• Faulty display. (•) Change.
(•) Change display.
The warning light blinks even when
the engine water temperature indicator
is in the correct range. • Faulty thermostat. (•) Change.