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STEERING
19-41
PUMP SERVICE DIAGNOSIS (CONT'D)
CONDITION
POSSIBLE CAUSE
CORRECTION
Further possible causes could be:
(6)
Sticking flow control valve.
In order to diagnose conditions such as
Sticking flow control valve.
listed in (6), (7), (8), (9) a pressure test
of the entire power steering system is
(7) Insufficient pump pressure output.
required.
(8)
Excessive internal pump leakage.
(9)
Excessive internal gear leakage.
FOAMING MILKY
0)
Air in the fluid, and loss of fluid due to
0)
Check for leaks and correct. Bleed
POWER STEERING
0)
internal pump leakage causing overflow.
0)
system. Extremely cold temperatures will
FLUID, LOW FLUID
internal pump leakage causing overflow.
cause system aeriation should the oil
LEVEL AND
level be low. If oil level is correct and
POSSIBLE LOW
pump still foams, remove pump from
PRESSURE
vehicle and separate reservoir from body.
Check welsh plug and body for cracks.
If plug is loose or body is cracked,
replace body.
LOW PUMP
(1) Flow control valve stuck or inoperative.
(1). Remove burrs or dirt or replace. Flush
PRESSURE
(1) Flow control valve stuck or inoperative.
(1).
system.
(2) Pressure plate not flat against cam ring.
(2) Correct.
MOMENTARY
(1) Low oil level in pump.
(1) Add power steering fluid as required.
INCREASE IN EFFORT
Add power steering fluid as required.
WHEN TURNING
WHEEL FAST TO
(2) Pump belt slipping.
(2) Tighten or replace belt.
RIGHT OR LEFT
(2) Pump belt slipping.
(2) Tighten or replace belt.
(3) High internal leakage:
(3) Check pump pressure. (See pressure
test.)
STEERING WHEEL
(1) Low oil level.
(1) Fill as required.
SURGES OR JERKS
(1)
(1) Fill as required.
WHEN TURNING WITH
ENGINE RUNNING
(2)
Loose pump belt.
(2) Adjust tension to specification.
ESPECIALLY DURING
(2)
Loose pump belt.
(2) Adjust tension to specification.
PARKING
(3) Steering linkage hitting engine oil pan at
(3) Correct clearance.
full turn.
(4)
Insufficient pump pressure.
(4)
Check pump pressure. (See pressure
test.) Replace flow control valve if
defective.
(5) Sticking flow control valve.
(5)
Inspect for varnish or damage, replace
if necessary.
EXCESSIVE WHEEL
(1)
Air in system.
0)
Add oil to pump reservoir and bleed by
KICKBACK OR LOOSE
(1)
operating steering. Check hose connectors
STEERING
for proper torque and adjust as required.
J8919-69
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