Problem
Main causes
Remedy
Radiator coolant level caution lamp
lights up.
Lowered coolant level, leakage of
coolant
Check, add coolant, repair. See
CHECKS BEFORE STARTING.
Dirt or scale accumulated in cooling
system
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clogged radiator fins or damaged fin
Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Defective thermostat
Replace thermostat. (*)
Loosened radiator filler cap (in high
altitude operation)
Tighten cap or replace packing.
Defective coolant level sensor
Replace sensor.
Defective monitor
Replace monitor.
Starting motor turns but engine does
not start.
Lack of fuel
Add fuel. See CHECKS BEFORE
STARTING.
Air in fuel system
Repair place where air is sucked in.
See EVERY 500 HOURS MAINTE-
NANCE.
Defective fuel injection pump or de-
fective nozzle
Replace pump or nozzle. (*)
Starting motor turns engine sluggish-
ly.
See ELECTRICAL SYSTEM.
Preheating caution lamp does not
light up.
See ELECTRICAL SYSTEM.
Defective compression
(Defective valve clearance)
Adjust valve clearance. (*)
Exhaust gas color is white or bluish.
Water entry in KDPF
Check, repair. (*)
Broken KDPF
Replace KDPF. (*)
Excessive oil in oil pan
Set oil to specified level. See
CHECKS BEFORE STARTING.
Improper fuel
Replace with specified fuel.
Exhaust gas turns black from time to
time.
Broken KDPF
Replace KDPF. (*)
Combustion makes breathing sound
from time to time.
Defective nozzle
Replace nozzle. (*)
Abnormal noise is generated.
(Combustion or mechanical)
Low grade fuel being used
Replace with specified fuel.
Overheating
Refer to "Radiator coolant level cau-
tion lamp lights up" above.
KDPF broken internally
Replace KDPF. (*)
Excessive valve clearance
Adjust valve clearance. (*)
TROUBLES AND ACTIONS
OPERATION
3-266
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...