Problem
Main causes
Remedy
Excessive bubbles are in oil.
Poor quality of oil
Replace the oil with oil of good quali-
ty.
Hydraulic oil in the hydraulic tank is
insufficient.
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
Air is in oil system.
Replace the filter. See Every "EVERY
2000 HOURS MAINTENANCE".
Oil pressure is low.
Pump sucks air because of insuffi-
cient hydraulic oil in the hydraulic
tank.
Add oil referring to "EVERY 100
HOURS MAINTENANCE", and bleed
air referring to "EVERY 2000 HOURS
MAINTENANCE".
Movement of cylinder is irregular.
Hydraulic oil in the hydraulic tank is
insufficient.
Add oil to specified level. See EVERY
100 HOURS MAINTENANCE.
PHENOMENA AND ACTIONS FOR ENGINE RELATED PARTS
• 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
Engine oil pressure caution lamp
lights up.
Lowered oil level in engine oil pan
(sucking in air)
Set oil to specified level. See
CHECKS BEFORE STARTING.
Improper oil is used. (Viscosity is im-
proper.)
Replace oil. See USE OF FUEL,
METHOD FOR USING FUEL, COOL-
ANT AND LUBRICANTS ACCORD-
ING TO AMBIENT TEMPERATURE.
Clogged oil filter cartridge
Replace cartridge. See EVERY 500
HOURS MAINTENANCE.
Oil leakage due to improper connec-
tion or breakage of oil pipe or pipe
joint
Check, repair. (*)
Defective engine oil pressure sensor
Replace sensor. (*)
Defective monitor
Replace monitor. (*)
Steam spurts out from top of radiator
(pressure valve).
Lowered coolant level, leakage of
coolant
Check, add coolant, or repair. See
WHEN REQUIRED.
Defective fan pump or motor
Check, repair. (*)
Indicator of engine coolant tempera-
ture gauge is in red range
Accumulation of dirt or scale in cool-
ing system
Check, add coolant, or repair. See
WHEN REQUIRED.
Engine coolant temperature caution
lamp lights up.
Clogged radiator fins or damaged fin
Clean or repair them. See WHEN
REQUIRED.
Defective thermostat
Replace thermostat. (*)
Defective sealing of thermostat
Replace thermostat seal. (*)
Loose radiator filler cap
(In high altitude operation)
Tighten cap or replace packing.
Defective coolant temperature gauge
Replace coolant temperature gauge.
(*)
Defective coolant level sensor
Replace sensor.
Defective monitor
Replace. (*)
OPERATION
TROUBLES AND ACTIONS
3-253
Summary of Contents for WA480-8
Page 2: ......
Page 19: ...Distributor name Address Phone Fax Service personnel FOREWORD PRODUCT INFORMATION 1 17...
Page 29: ...LOCATION OF SAFETY LABELS SAFETY SAFETY LABELS 2 3...
Page 159: ...SWITCHES 1 ECSS switch 2 Front working lamp switch OPERATION EXPLANATION OF COMPONENTS 3 91...
Page 302: ...Securing position Fixing angle A 61 B 53 C 33 D 38 TRANSPORTATION OPERATION 3 234...
Page 324: ......
Page 397: ...Viewed from the rear side of the machine MAINTENANCE MAINTENANCE PROCEDURE 4 73...
Page 402: ......
Page 403: ...SPECIFICATIONS 5 1...
Page 406: ......
Page 422: ......
Page 423: ...REPLACEMENT PARTS 7 1...
Page 439: ......