Komatsu PC700LC-11, Operation & Maintenance Manual

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Problem Main causes Remedy
Pinion of starting motor repeats en-
gaging and disengaging (rattles). Insufficient battery charge Charge battery.
Defective safety relay Replace. (*)
Starting motor turns engine sluggish-
ly. Insufficient battery charge Charge battery.
Defective starting motor Replace. (*)
Starting motor disengages before
engine starts. Defective wiring, defective ring gear
and pinion Check, repair. (*)
Insufficient battery charge Charge battery.
Preheating pilot lamp does not light
up. Defective wiring Check, repair. (*)
Defective heater relay Replace. (*)
Defective monitor Replace. (*)
Oil pressure caution lamp does not
light up when engine is stopped
(starting switch is at ON position). Defective monitor Replace. (*)
Defective oil pressure caution switch Replace. (*)
When startability at low temperature
is poor, if you touch the outside of
the electric heater by hand after pre-
heating, it is not felt warm. Defective wiring Check, repair. (*)
Wire breakage in electrical intake air
heater Replace. (*)
Defective operation of heater relay Replace. (*)
Blown fuse of the heater Replace. (*)
Engine does not start.
(“L04” lights up on monitor.) Damaged data in the controller Check, repair. (*)
Other system troubles Check, repair. (*)
PHENOMENA AND ACTIONS FOR CHASSIS
• Contact your Komatsu distributor for the remedies indicated with (*) in the remedy column.
• Ask your Komatsu distributor for repairs for problems or causes which are not listed below.
Problem Main causes Remedy
Speed of travel, swing, boom, arm,
bucket is slow Lack of hydraulic oil Make the oil level to the specified lev-
el by referring to CHECKS BEFORE
STARTING.
Pump generates unusual noise. Clogged element in hydraulic tank
strainer
Looseness of the suction hose
Lack of hydraulic oil Clean. See EVERY 2000 HOURS
MAINTENANCE.
Retighten.
Make the oil level to the specified lev-
el.
Excessive rise in hydraulic oil temper-
ature Dirty oil cooler Clean. See EVERY 500 HOURS
MAINTENANCE.
Lack of hydraulic oil Make the oil level to the specified lev-
el by referring to CHECKS BEFORE
STARTING.
Track comes off.
Track too loose
Adjust track tension. See WHEN RE-
QUIRED.
Abnormal wear of sprocket
Bucket rises slowly or does not rise at
all. Lack of hydraulic oil Make the oil level to the specified lev-
el by referring to CHECKS BEFORE
STARTING.
TROUBLES AND ACTIONS OPERATION
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