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System Faults Possible causes Solutions
Engine
Engine stops at low
speed revolution.
▲ Fault of injection pump
▲ Valve gap is not correct
▲ Poor nozzle pressure
▲ Repair
▲ Adjust the gap
▲ Repair
Engine overheat
▲ Lack of coolant
▲ Bad fan belt tension or broken
▲ Dirt attached to the radiator
▲ Supplement
▲ Adjust belt tension or
replace
▲ Wash
The color of exhausted
smoke is white.
▲ Air cleaner clogged
▲ Engine oil exceeded
▲ Lack of fuel supply
▲ Clean element or replace
▲ Adjust in proper level
▲ Repair
The color of exhausted
smoke is black.
▲ Bad quality of fuel
▲ Over fuel supply
▲ Fault of nozzle
▲ Use good quality fuel
▲ Repair
▲ Repair
Engine power is low.
▲ Injection nozzle clogged
▲ Carbon piled to valve seat
▲ Bad adjustment of valve gap
▲ Bad injection timing
▲ Lack of fuel supply
▲ Air cleaner clogged
▲ Repair
▲ Repair
▲ Repair
▲ Repair
▲ Check fuel system
▲ Clean or replace
Engine oil pressure
indicator is ON during
operation.
▲ Lack of engine oil
▲ Low viscosity of engine oil
▲ Pressure switch error
▲ Fault of oil pump
▲ Engine oil filter clogged
▲ Supplement
▲
Replace the proper oil viscosity
▲ Replace
▲ Repair
▲ Replace the filter
Battery charging
indicator is ON during
operation
▲ Bad electrical connection
▲ Fault of alternator
▲ Fault of battery
▲
Bad fan belt tension or broken
▲ Check battery terminals,
ground, and repair
▲ Repair or replace
▲ Replace
▲
Adjust belt tension or replace
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