Jeep 1987 Wrangler Workshop Manual page 870

STEERING AND FRONT AXLE
tit
POWER STEERING PUMP
tit
POWER STEERING PUMP DIAGNOSIS (cont'd.)
Condition
S E E
I.S.
N
O
T
E
S
F O A M I N G M I L K Y
POWER S T E E R I N G
F L U I D , LOW F L U I D
L E V E L A N D
P O S S I B L E LOW
P R E S S U R E
LOW PUMP
P R E S S U R E
M O M E N T A R Y
I N C R E A S E IN E F F O R T
WHEN T U R N I N G
W H E E L F A S T T O
R I G H T O R L E F T
S T E E R I N G W H E E L
S U R G E S O R J E R K S
WHEN T U R N I N G WITH
E N G I N E R U N N I N G
E S P E C I A L L Y D U R I N G
P A R K I N G
E X C E S S I V E W H E E L
K I C K B A C K O R L O O S E
S T E E R I N G
Possible Cause
(6) Sticking flow control valve
(7)
Insufficient pump pressure output
(8)
Excessive internal pump leakage
(9)
Excessive internal gear leakage
(1)
Air in the fluid, and loss of fluid
due to internal pump leakage caus-
ing overflow
(1)
Flow control valve stuck or inoper-
ative.
( 2 )
Pressure plate not flat against cam
ring
(1) Low oil level in pump.
( 2 )
Pump belt slipping
(3) High internal leakage
(1)
Low oil level
( 2 )
Loose pump belt
(3) Steering linkage hitting engine oil
pan at full turn
(4)
Insufficient pump pressure
(5)
Sticking flow control valve
(1)
Air in system
Correction
In order to diagnose conditions such as
listed in (6), (7), (8), (9) a pressure test
of the entire power steering system is
required.
(1)
Check for leaks and correct. Bleed
system. Extremely cold tempera-
tures will cause system aeriation
should the oil level be low. If oil
level is correct and pump still
foams, remove pump from vehicle
and separate reservoir from body.
Check welsh plug and body for
cracks. If plug is loose or body is
cracked, replace body
(1)
Remove burrs or dirt or replace.
Flush system.
( 2 )
Correct
(1)
Add power steering fluid as re-
quired
( 2 )
Tighten or replace belt
(3) Check pump pressure. (See pres-
sure test)
(1)
Fill as required
( 2 )
Adjust tension to specification
(3) Correct clearance
(4)
Check pump pressure. (See pres-
sure test). Replace flow control
valve if defective
(5)
Inspect for varnish or damage, re-
place if necessary
(1)
Add oil to pump reservoir and bleed
by operating steering. Check hose
connectors for proper torque and
adjust as required
G-100
8 4 8 1 1 B