GMC 1976 ZEO 6083 Maintenance Manual page 543

STEERING
9- 1 1
STEERING GEAR AND PUMP DIAGNOSIS CHART (Cont'd.)
Condition Possible Cause
Correction
Steering wheel surges or
1 . Low oil level.
1. Fill as required .
jerks when turning with
engine running espe-
cially during parking.
2 . Loose pump belt .
2. Adjust tension to specification.
3. Steering linkage hit-
3 . Correct clearance.
ting engine oil pan at
full turn .
4. Insufficient pump
4. Check pump pressure . (See pump
pressure . pressure test).
Replace relief valve if defective.
5. Sticky flow control
5 . Inspect for varnish or damage,
valve.
replace if necessry .
Excessive wheel kick- 1 . Air in system . 1 . Add oil to pump reservoir and
back or loose steering . bleed by operating steering .
Check hose connectors for proper
torque and adjust as required .
2. Steering gear loose on 2. Tighten attaching screws to
frame. specified torque .
3 . Steering gear flexible 3. Tighten flange pinch bolts to
coupling loose on shaft 30 foot-pounds, if serrations are
or rubber disc mounting not damaged. Tighten upper flange
screws loose. to coupling nuts to specified
torque .
4. Steering linkage joints 4. Replace loose pivots .
worn enough to be loose.
5 . Worn poppet valve 5. Replace poppet valve.
(Gear) .
6. Loose thrust bearing 6. Adjust to specification with
preload adjustment . gear out of vehicle.
(Gear) .
7. Excessive "over-center"
7. Adjust to specification with
lash . gear out of vehicle .
Hard steering or lack 1 . Loose pump belt . 1 . Adjust belt tension to
of assist. specification .
2. Low oil level in res- 2. Fill to proper level. If exces-
ervoir . sively low, check all lines and
joints for evidence of external
leakage. Tighten loose connectors
to 30-ft-lbs.
NOTE : Low oil level will
also result in excessive
pump noise.
3 . Steering gear to column 3. Align steering column .
misalignment .
4. Lower coupling flange 4. Loosen pinch bolt and assemble
rubbing against steer- properly .
ing gear adjuster plug .