Problem
Main causes
Remedy
Unusual noise is generated from al-
ternator.
Defective alternator
Replace. (*)
Starting motor does not rotate even
when starting switch is turned to
START position.
Defective wiring
Check, repair. (*)
Defective starting motor
Replace. (*)
Insufficient battery charge
Charge battery.
Battery disconnect switch at OFF po-
sition
Turn ON.
Engine shutdown secondary switch
at “STOP ENGINE” position
Set it to “NORMAL” position.
Apply the cover.
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
• For the remedies indicated with (*) in the remedy column, always contact your Komatsu distributor.
• In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem
Main causes
Remedy
Speed of travel, swing, boom, arm,
bucket is slow
Lack of hydraulic oil
Set oil to specified level. See
CHECKS BEFORE STARTING.
Pump generates abnormal noise.
(sucking in air)
Clogged element in hydraulic tank
strainer, lack of oil
Clean. See EVERY 2000 HOURS
MAINTENANCE.
Excessive rise in hydraulic oil temper-
ature
Dirty oil cooler
Clean. See EVERY 500 HOURS
MAINTENANCE.
Lack of hydraulic oil
Set oil to specified level. See
CHECKS BEFORE STARTING.
TROUBLES AND ACTIONS
OPERATION
3-264
Содержание PC490-11
Страница 2: ......
Страница 25: ...LOCATION OF SAFETY LABELS a b c d e f g h KS000848 T T SAFETY SAFETY LABELS 2 5...
Страница 48: ...Map with mirror and rear view camera visibility aids fitted PRECAUTIONS FOR OPERATION SAFETY 2 28...
Страница 72: ......
Страница 73: ...OPERATION Please read and make sure that you understand the SAFETY section before reading this section 3 1...
Страница 340: ......
Страница 341: ...MAINTENANCE Please read and make sure that you understand the SAFETY section before reading this section 4 1...
Страница 421: ...SPECIFICATIONS 5 1...
Страница 425: ...6 7m Boom PC490 11 SPECIFICATIONS SPECIFICATIONS 5 5...
Страница 426: ...6 7m Boom PC490LC 11 SPECIFICATIONS SPECIFICATIONS 5 6...
Страница 428: ...7 1m Boom PC490 11 SPECIFICATIONS SPECIFICATIONS 5 8...
Страница 429: ...7 1m Boom PC490LC 11 SPECIFICATIONS SPECIFICATIONS 5 9...
Страница 430: ......
Страница 474: ......
Страница 475: ...REPLACEMENT PARTS 7 1...
Страница 491: ......
Страница 492: ...PC490 11 PC490LC 11 HYDRAULIC EXCAVATOR Form No UENAM01105 2016 KOMATSU All Rights Reserved Printed in Belgium 11 2016...