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2L-10
POWER STEERING GEAR AND PUMP
Service Diagnosis—Steering Gear and Pump (Continued)
Condition
Possible Cause
Correction
FOAMING AERATED
POWEE STEERING
FLUID, LOW FLUID
LEVEL AND
POSSIBLE LOW
PRESSURE
LOW PRESSURE DUE
TO STEERING PUMP
LOW PRESSURE DUE
TO STEERING GEAR
(1)
Air in fluid, and loss of fluid
due t o p u m p internal leakage
causing overflow.
(1)
Flow control valve stuck or in-
operative.
(2)
Pressure plate n o t flat against
cam ring.
(3)
Extreme wear of cam ring.
(4)
Scored pressure plate, thrust
plate, or rotor.
(5)
Vanes n o t installed properly.
(6)
Vanes sticking in rotor slots.
(7)
Cracked or broken thrust or
pressure plate.
(1)
Pressure loss in cylinder due t o
worn piston ring or badly worn
housing bore.
(2)
Leakage at valve rings, valve
body-to-worm seal.
(1)
Check for leak and correct. Bleed
system. Extremely cold tempera-
tures will cause system aeration
should the oil level be low. If oil
level is correct and p u m p still
foams, remove p u m p from ve-
hicle and separate reservoir from
housing. Check welsh plug and
housing for cracks. If plug is
loose or housing is cracked, re-
place housing.
(1)
Remove burrs or dirt or replace.
Flush system.
(2)
Correct.
(3)
Replace parts. Flush system.
(4)
Replace parts. Flush system.
(5)
Install properly.
(6)
Freeup by removing burrs, varnish,
or dirt.
(7)
Replace part.
(1)
Remove gear for disassembly
and inspection of ring and
housing bore.
(2)
Remove gear for disassembly
and replace seals.
LEAK DIAGNOSIS
The actual source of power steering system fluid leaks
should always be determined before attempting repair.
Because innaccurate diagnosis can lead to ineffective
repair, proper inspection procedures are necessary. The
most common fluid leak sources are shown in figures
2L-6, 2L-7, and 2L-8.
Inspection Procedure
(1) Raise front of vehicle.
(2) Clean exterior surfaces of steering gear, pump,
hoses, and fittings thoroughly.
(3) Check pump fluid level. Add or remove fluid as
necessary.
(4) Check for aerated fluid (orange in color and full
of bubbles) which can cause overflow from reservoir and
be mistaken for leak.
(5) Check and tighten all hose connections at gear
and pump. Do not exceed 30" foot-pounds (41 N»m)
torque at any fitting.
(6) Start engine. Have helper turn steering wheel
left and right several times while locating source of leak.
Contact steering stops momentarily in each direction
when turning wheel.
(7) Stop engine when leak source is identified.
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Troubleshooting
