Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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Inspection for Low Pressure/High Pressure Oil Circuit:
Low pressure oil circuit
Check fuel tank supply. Only checking the fuel tank
level indicator is not enough, for its indication may
be invalid.
Is there no fuel in the fuel tank? Add fuel.
Check the status and function of manual pump.
Fault of manual pump
Repair accordingly.
Visually inspect the low pressure pipeline (leakage,
coordination, connection)
Repair accordingly. Fault of low pressure pipeline
Ensure there is no air bubble in the low pressure oil
circuit.
Is there air in the oil circuit?
Find out where the air comes from
and repair the system, and then clean
the fuel pipe.
Ensure the diesel filter model and the connection of
fuel inlet and outlet are correct.
Incorrect signal or connection
Replace the current filter with the
original one or connect the inlet and
outlet pipes of filter correctly.
Repair accordingly.
High pressure oil circuit
Make diagnosis for the high pressure oil circuit in
strict accordance with the diagnostic procedures for
high pressure oil circuit.
Is there any problem?
The high pressure oil circuit is intact.
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