Hummer H1 Service Manual page 512

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Problem
Low Oil Pressure Due to
Restriction in the Hose
Low Oil Pressure Due to
Steering Gear.
Refer to "Power Steering Sys-
tem Test" in this Section.
Low Oil Pressure Due to
Steering Pump.
Refer to "Power Steering Sys-
tem Test" in this Section.
Chirp Noise in Steering Pump
or Belt Squeal (Particularly
Noticeable At Full Wheel
Travel and Standstill Parking)
Growl Noise in Steering Pump 1. Excessive back pressure in hoses or steer-
Growl Noise in Steering Pump
(Particularly Noticeable
Standstill Parking)
Groan Noise in
Steering Pump
Rattle or Knock Noise in
Steering Pump
Swish Noise in Steering Pump 1.
Whine Noise in
Steering Pump
05745159
Table 3 Power Steering Diagnosis Chart - part 3
Possible Cause
1. Check for kinks in hose.
2. Foreign object stuck in the hose.
1. Pressure loss in cylinder due to worn rack
piston ring or scored housing bore.
2. Leakage at the valve rings and valve body
to the worm seal.
3. Leakage at the valve body or a loose fitting
spool.
1. Flow control valve stuck or inoperative.
2. Pressure plate not flat against the cam ring.
3. Extreme wear of cam ring.
4. Scored pressure plate, thrust plate, or
rotor.
5. Vanes sticking in rotor slots.
6. Vanes not installed properly.
7. Air in oil.
8. Low oil level.
9. Pump belt slipping.
10. Damaged hoses or steering gear.
1. Pump belt slipping.
ing gear caused by restriction.
1. Scored pressure plates, thrust plate, or
rotor. Extreme wear of cam ring.
1. Low oil level.
2. Air in the oil. Poor pressure hose connec-
tion.
1. Loose pump pulley.
2. Pump vanes sticking in rotor slots.
3. Pressure hose touching other parts of vehi-
cle.
Faulty flow control valve.
1. Pump shaft bearing scored.
Steering System
Correction
1. Remove the kinks or replace the hose.
2. Remove the foreign object or replace the
hose.
1. Disassemble the steering gear. Inspect the
ring and housing bore. Replace the
affected parts.
2. Disassemble steering gear and replace
seals.
3. Replace the valve.
1. Replace pump.
2. Replace pump.
3. Replace pump and flush system.
4. Replace pump. Flush the system.
5. Replace pump.
6. Replace pump.
7. Locate source of leak and correct. Bleed
the system.
8. Add power steering fluid as required.
9. Adjust belt.
10. Replace as necessary.
1. Replace belt.
1. Locate restriction and correct.
1. Replace pump and flush system.
1. Add power steering fluid as required.
2. Torque the connector. Bleed the system.
1. Replace pulley or pump.
2. Replace pump.
3. Adjust hose position.
1. Replace pump.
1. Replace pump.
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