5-12
Problem
Noise or vibration
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Air inclusion in the system.
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Valve timing error when the unit is
assembled.
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Hydraulic pipe noise interference.
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Control valve damage or clogging.
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Bleed the air.
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Correct the timing.
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Consult the component manufacturer.
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Replace the valve.
C
C
ause
Remedy
Heavy steering operation
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Lack of sufficient oil supply.
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Excessive heat.
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Broken pump.
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Leakage in the line or connections.
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Clogged orifice.
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High back pressure.
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Check the pump and the line.
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Locate the heat source and correct it.
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Replace it.
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Replace it.
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Disassemble, clean, and reassemble
it.
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Adjust the pressure.
Irregular or no response
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Broken pump.
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Excessive heat.
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Broken centering spring.
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Misalignment with column.
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Incorrect piping to the four port.
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Parts missing.
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High back pressure.
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Corrosion on the moving parts.
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Replace it.
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Locate the heat source and remove it.
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Replace it.
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Disassemble and adjust it.
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Correct it.
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Install the parts correctly.
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Adjust the pressure.
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Replace it.
Oil leakage
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Fittings loose, worn, or damaged.
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Deteriorated seals by excessive heat.
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Loose screw or its deteriorated
sealing.
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Internal seals worn or damaged.
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Damaged seal grooves.
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Housing crack.
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Check and replace the damaged
parts.
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Replace the seals.
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Replace the sealing and tighten
screw appropriately.
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Replace it.
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Replace the unit or related parts.
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Replace the unit.
P
P
OWER STEERING UNIT
2)