Jeep 1996 Grand Cherokee Service Manual - page 1114
POWER STEERING PUMP PRESSURE TEST
(1) Check belt tension and adjust as necessary.
(2) Disconnect high pressure hose at gear or pump.
Use a container for dripping fluid.
(3) Connect pressure gauge from Power Steering
Analyzer Tool kit 6815 to both hoses using appropri-
ate adapter. Connect spare pressure hose to gear or
pump.
(4) Open the test valve completely.
(5) Start engine and let idle long enough to circu-
late power steering fluid through flow/pressure test
gauge and to get air out of the fluid. Then shut off
engine.
(6) Check fluid level, add fluid as necessary. Start
engine again and let idle.
(7) Gauge should read below 862 kPa (125 psi), if
above, inspect the hoses for restrictions and repair as
necessary. The initial pressure reading should be in
the range of 345-552 kPa (50-80 psi).
CAUTION: The following test procedure involves
testing maximum pump pressure output and flow
control valve operation. Do not leave valve closed
for more than five seconds as the pump could be
damaged.
(8) Close valve fully three times and record high-
est pressure indicated each time. All three read-
ings must be above specifications and within
345 kPa (50 psi) of each other.
• Pressures above specifications but not within
345 kPa (50 psi) of each other, replace pump.
• Pressures within 345 kPa (50 psi) of each other
but below specifications, replace pump.
NOTE: Refer to pump relief pressure chart.
CAUTION: Do
not
force
the
pump
to
operate
against the stops for more than 2 to 4 seconds at a
time because, pump damage will result.
(9) Open the test valve, turn steering wheel
extreme left and right positions against the stops.
Record the highest indicated pressure at each posi-
tion. Compare readings to specifications. If highest
output pressures are not the same against either
stop, the gear is leaking internally and must be
repaired.
PUMP LEAKAGE DIAGNOSIS
SERVICE PROCEDURES
POWER STEERING PUMP—INITIAL OPERATION
CAUTION: The fluid level should be checked with
engine off to prevent injury from moving compo-
nents. Use MOPAR Power Steering Fluid or equiva-
lent. Do not use automatic transmission fluid and
do not overfill.
Wipe filler cap clean, then check the fluid level.
The dipstick should indicate COLD when the fluid is
at normal temperature.
(1) Fill the pump fluid reservoir to the proper level
and let the fluid settle for at least two (2) minutes.
(2) Start the engine and let run for a few seconds
then turn engine off.
(3) Add fluid if necessary. Repeat the above proce-
dure until the fluid level remains constant after run-
ning the engine.
(4) Raise the front wheels off the ground.
(5) Slowly turn the steering wheel right and left,
lightly contacting the wheel stops at least 20 times.
(6) Check the fluid level add if necessary.
(7) Lower the vehicle, start the engine and turn
the steering wheel slowly from lock to lock.
ENGINE
RELIEF PRESSURE
6
50
4.0L
9653 kPa (1400 psi)
5.2L
9653 kPa (1400 psi)
ZJ
STEERING
19 - 5
DIAGNOSIS AND TESTING (Continued)