Hydraulic Pressure Test - Jeep J-10 Series 1982 Technical & Service Manual

(6) If fluid is aerated, check for overfill condition, or
air entering fluid through loose hose connection or reser
voir O-ring seal, or perform hydraulic pressure test to
check for sticking flow control valve.
(7) If leak occurs from cracked or porous pump
body or reservoir, replace pump as assembly.
HYDRAULIC PRESSURE TEST
The hydraulic pressure test is performed using Test
Gauge J-21567. The fittings on the test gauge and gauge
valve have 1/4 pipe threads. Any combination of fittings
is acceptable for gauge installation and connection can
be made at the pump or gear as desired. However, the
gauge must be connected in the pressure line circuit
between pump and test gauge valve at all times.
CAUTION: Some steering gear and pump units have
metric thread fittings and hose fittings which use an 0-
ring seal (fig. 2L-7, View B). In order to use gauge J-
21567, hose fitting adapters J-5176-50, must be installed
on the existing gauge hoses before using the test gauge.
Test Procedure
(1) Check condition of power steering fluid. Drain
and replace fluid if it contains small amount of dirt or
contaminant. If fluid is exceptionally dirty, con
taminated, or full of debris or foreign material, gear and
pump should be disassembled and serviced.
(2) If fluid is full of bubbles, bleed power steering
system. Refer to Fluid Level and Initial Operation in
Power Steering Pump section.
(3) Check and adjust pump drive belt tension, if
necessary.
(4) Position drip pan under pump.
(5) Disconnect pressure hose at pump. Keep hose
end raised to avoid excessive fluid loss.
(6) Connect pressure hose to Test Gauge J-21567.
Refer to Pump Diagnosis Charts. Install hose fitting
adapters J-5176-50 if gear and pump have metric thread
fittings.
(7) Connect test gauge hose to pump. Refer to Pump
Diagnosis Charts.
(8) Open test gauge valve completely. Turn valve
counterclockwise to open.
(9) Fill pump reservoir with power steering fluid.
(10) Shift transmission into neutral, apply parking
brakes, start engine, and operate engine until power
steering fluid reaches normal operating temperature.
(11) Record pump initial output pressure registered
on test gauge. Pressure should be 80 to 125 psi (552 to
862 kPa) with gauge valve open completely.
NOTE: If the initial output pressure exceeds 200 psi
(1 379 kPa), stop the engine and check the test gauge and
pressure hoses for restrictions.
POWER STEERING GEAR AND PUMP 21-15
(12) Check pump maximum output pressure as fol
lows: Close gauge valve completely for 2 to 3 seconds;
then open valve completely. Perform this procedure
three times in succession and record highest pressure
developed each time valve is closed.
CAUTION: Do not hold the gauge valve closed for
more than five seconds at a time as pump damage could
occur.
(13) On CJ and Scrambler models, maximum pump
output pressures should be in 1000 to 1100 psi (6 895to
7 584 kPa) range and not vary by more than 50 psi (345
kPa). On all other models, pressures should be in 1400 to
1500psi (9 653 to 10 342 kPa) range and also not vary by
more than 50 psi (345 kPa).
For example if recorded pressures on CJ and Scram
bler models were 1050-1060-1070 psi (7 240-7 309-7 378
kPa), or 1450-1480-1470 psi (9 998-10 205-10 136 kPa) on
Cherokee, Wagoneer and Truck models, maximum pres
sures are within allowable variance and pump operation
is within limits.
(14) If maximum pressures were within specified
high ranges but varied by more than 50 psi (345 kPa),
flow control valve is sticking. Remove and clean valve
and remove any surface imperfections with crocus cloth.
(15) If pump flow control valve was serviced, repeat
pressure test to check valve operation before proceeding.
(16) Turn steering wheel right and left. Contact
steering stops in both directions and record highest pres
sure developed when each stop is contacted. If pressures
are 1000 to 1100 psi (6 895 to 7 584 kPa) on CJ and
Scrambler models, or 1400 to 1500 psi (9 653 to 10 342
kPa) on all other models, pump is operating properly.
CAUTION: Do not hold the steering wheel against the
steering stops for more than five seconds at a time as
pump damage could occur.
(17) If pump maximum output pressure cannot be
duplicated at each steering stop, steering gear is leaking
internally and must be disassembled and serviced.
(18) If pump output pressures were duplicated at
each steering stop, proceed to next step.
(19) Stop engine and remove test gauge.
(20) Connect pressure hose to pump. Tighten hose
fitting to 30 foot-pounds (41 N«m) torque.
(21) Check and adjust power steering fluid level as
necessary.
(22) Remove drain pan.
PERIODIC MAINTENANCE
Power steering fluid level and condition should be
checked periodically as outlined in the Maintenance
Schedule. A dipstick attached to the pump reservoir cap
is used to check fluid level.
Fluid level can be checked when cold or at operating
temperature. At operating temperature, the fluid level
should be at the FULL HOT mark on the dipstick. When
cold it should be at the FULL COLD mark. If the fluid