Komatsu PC20R-8 User Manual

114
TROUBLESHOOTING
3.15.5 OTHER TROUBLES
3.15.5.1 ELECTRICAL CIRCUIT
3.15.5.2 HYDRAULIC SYSTEM
(•): Always contact your Komatsu Utility Dealer when you have to carry out this operation.
• : If the anomaly or its cause are not included in the failures indicated below, contact your Komatsu Utility Deal-
er for the necessary repair.
TROUBLE CAUSE REMEDY
Lights do not work satisfactorily even
with engine running at high speed:
• Faulty cables.
• Faulty fan belt tension.
(•) Check and repair any loose termi-
nal and connection.
• Adjust fan tension (see “EVERY 250
HOURS”).
Lights come on intermittently with
engine running:
Alternator charge warning light does
not go out with engine running and
increasing speed:
• Faulty alternator.
• Faulty cables.
(•) Change.
(•) Check and repair.
Alternator emits an abnormal noise:
• Faulty alternator. (•) Change.
Starter does not turn with key in
START position:
• Faulty cables.
• Battery charge insufficient.
• Faulty main fuse.
(•) Check and repair.
• Charge battery.
• Change.
Starter pinion engages and then dis-
engages:
• Battery charge insufficient. • Charge battery.
Starter makes engine run slowly:
• Battery charge insufficient.
• Faulty starter.
• Charge battery.
(•) Change.
Starter disengages before engine has
started:
• Faulty cables.
• Battery charge insufficient.
(•) Check and repair.
• Charge battery.
Engine oil pressure warning light does
not come on when engine is stopped
(ignition key in position «»):
• Faulty bulb.
• Faulty pressure sensor.
(•) Change.
(•) Change.
Alternator charge warning light does
not come on when engine is stopped
(ignition key in position «»):
• Faulty bulb.
• Faulty cables.
(•) Change.
(•) Check and repair.
TROUBLE CAUSE REMEDY
Pump emits an abnormal noise:
• No oil in the tank.
• Faulty pump.
• Hydraulic oil unsuitable for the tem-
perature.
• Top up.
(•) Repair or change.
• Change.
Equipment control levers do not return
automatically to neutral position:
• Broken return spring or seized ele-
ment.
(•) Change spring or distributor ele-
ment.
Equipment moves only at low speed:
• Faulty pump.
• Max. pressure valve setting incor-
rect, or valves not closed due to im-
purities.
• Dirty drain filter.
(•) Repair or change.
(•) Set or change.
• Change.

Komatsu PC20R-8 Specifications

General

Brand	Komatsu
Model	PC20R-8
Category	Excavators
Language	English