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Overheating
Driven unit normal?
Cooling
system
Hydraulic pressure source
Sagged
V-belt
Pressure cap
clogging and
malfunction
Thermostat
malfunction
Clogged heat-
exchanger
tubes
Excess intake
air resistance
Excess exhaust
resistance
Cylinder head
Fuel system
Injection OPEN/
CLOSE timing
Piston
Clogged air
cleaner
Clogged
muffler
Leakage through
head gasket
Improper fuel
injection timing
Improper valve
clearance
Seizure likeliness
Clogged
intake air pipe
Clogged cylinder
head exhaust outlet
Clogged
exhaust pipe
Cracked cylinder
head
Defective fuel
injection valve
Improper fuel
injection timing
Reduction in cool-
ing water pump
performance
Heat exchanger
malfunction
Insufficient
cooling water
Set relief pressure of control valve
Incresed exhaust
pressure
Clogged heat
exchanger
Broken or
worn V-belt
Add water
Clean or replace
Clean or replace
Adjust Replace
ReplaceReplace
Clean
Clean
Clean
Clean
Clean Clean
Replace
Clean or replace
Adjust
Clean
Replace
Repair
Adjust
Replace
Clean
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