Lifan 620 Maintenance Manual page 121

Fault
Swish noise
Sob noise
Leakage in power steering
pump or fuel tank
Abnormal noise
Insufficient return
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Table 2-3 (Continued 3)
Possible Cause
Oil at a temperature below 54°C
(130°F) flow into the bypass
valve of the housing of pump
valve.
With air in the oil and leakage in
the system.
Check O-ring oil seal of one-way
valve cap.
Too much oil.
Lost, loose or broken filler cap or
lost O-ring seal.
Loose or broken hose connector.
Leakage in shaft seal:
Broken oil seal.
Broken rotor shaft, e.g. groove or
bruise.
Worn bush or sleeve of shaft.
Inlet tube.
Perforated housing.
Loose nuts of outlet pipe
connector or plug valve.
Broken connector, nuts or plug of
outlet pipe.
Power steering oil (insufficient).
Universal joint (worn).
Power steering vane pump
(faulty).
Steering gear (faulty).
Tire (improper inflation).
Front wheel alignment
(incorrect).
Steering column (bent).
Steering gear (malfunction).
120
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Actions
Normal.
Purify the air in the system.
Install a new power steering pump if
necessary.
Correct the fluid level height if necessary.
Install a new filler cap or O-ring seal if
necessary.
Install a new hose connector if necessary.
Install a new power steering pump.
Install a new power steering pump.
Install a new power steering pump.
Lock it if necessary.
Install a new power steering pump.
Refill the oil if necessary and check if the
system has a leakage.
Replace it if necessary.
Check and replace it if necessary.
Replace it if necessary.
Adjust the tire pressure.
Align the wheels.
Align it and replace it if necessary.
Replace it if necessary.