Komatsu H75051 Operation & Maintenance Manual page 308

TROUBLES AND ACTIONS
Problem
Indicator of engine coolant tempera-
ture gauge does not rise up to the
green range
Starting motor turns but engine does
not start.
Exhaust gas color is white or bluish.
Exhaust gas turns black from time to
time.
Combustion makes breathing sound
from time to time.
Abnormal noise is generated.
(Combustion or mechanical)
DEF level caution lamp lights up.
3-242
Main causes
Defective thermostat
Defective coolant temperature gauge
Defective monitor
Lack of fuel
Air in fuel system
Fuel filter is not filled with fuel.
Defective fuel injection pump or injec-
tor
Starting motor turns engine sluggish-
ly.
Starting motor does not turn.
Preheating pilot lamp does not light
up.
Incorrect valve clearance
(Defective compression)
Water entry in the aftertreatment de-
vices
Breakage of the aftertreatment devi-
ces
Excessive oil in oil pan
Improper fuel
Breakage of the aftertreatment devi-
ces
Clogged air cleaner element
Defective injector
Defective compression
Defective turbocharger
Defective nozzle
Low grade fuel being used
Overheating
Breakage of inside of the aftertreat-
ment devices
Excessive valve clearance
Lowering of DEF level
Remedy
Replace thermostat. (*)
Replace coolant temperature gauge.
(*)
Replace. (*)
Add fuel. See CHECKS BEFORE
STARTING.
Repair portion where air is sucked in.
Fill filter with fuel. See EVERY 500
HOURS MAINTENANCE.
Replace pump or injector. (*)
See PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM.
See PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM.
See PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM.
Adjust valve clearance. (*)
Check, repair. (*)
Replace the aftertreatment devices.
(*)
Set oil to specified level. See
CHECKS BEFORE STARTING.
Replace with specified fuel.
Replace the aftertreatment devices.
(*)
Clean or replace. See WHEN RE-
QUIRED.
Replace injector. (*)
See the above section on defective
compression. (*)
Check, replace turbocharger. (*)
Replace nozzle. (*)
Replace with specified fuel.
Refer to "Indicator of engine coolant
temperature gauge is in red range"
as above.
Replace the aftertreatment devices.
(*)
Adjust clearance. (*)
Add DEF.
OPERATION