Komatsu WA100M-7, Operation And Maintenance Manual

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Troubleshooting 4.6 Other troubles
WA80M-7, WA100M-7 – VENAM03001
4-13
*) These tasks should be performed by the distributor.
ENGINE (continued)
Fault Cause Remedy
The background of the temperature
display lights up in red and the
acoustic warning signal sounds.
Engine overheated
Let the engine run in idle speed with-
out load until the engine has cooled
down and the coolant temperature
gauge is in the green range
Inside of coolant system calcified or
clogged
Clean inside of cooling system *)
Radiator (cooling surfaces, fins) is
dirty Clean the radiator (cooling surfaces,
fins)
Thermostat is not functioning
Check the function of the thermostat;
replace defective thermostat *)
Radiator cap defective or loose
Replace defective radiator cap; fas-
ten loose radiator cap
The temperature gauge display
flashes
No contact to the temperature sen-
sor, or the temperature sensor is
defective.
Check the contacts or replace the
temperature sensor *).
Coolant temperature gauge:
The coolant temperature gauge
does not show a temperature with
the engine warm in operation
Coolant temperature gauge is not
functioning
Check the function of the coolant
temperature gauge; replace defec-
tive coolant temperature gauge *)
Engine does not start
Fuel tank empty Add fuel and bleed the fuel system
Air in the fuel system Bleed the fuel system
Injection pump or injection nozzle is
not functioning Replace injection pump or injection
nozzle *)
Starter motor speed too low See “Electrical system”
Engine compression too low Check valve clearance *)
Exhaust has a white or blue colour
Oil level in the engine is too high Correct the oil level
Wrong fuel Use prescribed fuel
Exhaust coloured black intermit-
tently
Air cleaner filter insert clogged
Clean or replace air cleaner filter
insert
Injection nozzle defective Replace injection nozzles *)
Engine compression too low Check valve clearance *)
Combustion sounds like breathing
intermittently
Injection nozzles defective Replace injection nozzles *)