1988 JEEP CHEROKEE power steering fluid

ESP CD player sat nav jump start USB battery replacement

Page 651 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \003 EN G IN E R EM OVA L - 6 -C YL 1988 J e ep C hero ke e 1988 ENGINES Jeep - Engine Removal - 6-Cylinder Cherokee, Comanche, Wagoneer, Wrangler 6-CYLINDER$

\003
EN G IN E R EM OVA L - 6 -C YL

1988 J e ep C hero ke e
1988 ENGINES
Jeep - Engine Removal - 6-Cylinder
Cherokee, Comanche, Wagoneer, Wrangler
6-CYLINDER ENGINES
4.0L
1) Scribe hinge locations, remove engine compartment light
(if equipped) and remove hood. Disconnect battery cables and remove
battery. Drain cooling system.
2) Disconnect wire connectors from alternator, ignition coil
and distributor. Disconnect oil pressure sender wire, starter wires
and fuel injector wiring harness (if equipped). Detach 2 fuel pipe
quick connect couplings at left inner fender panel. Disconnect engine
ground strap and remove air cleaner.
3) Disconnect the vacuum purge hose at fuel vapor canister
tee. Disconnect wire from idle speed actuator and oxygen sensor.
Detach throttle cable from bracket and disconnect throttle valve rod
at bellcrank. Remove upper and lower radiator hoses.
4) On automatic transmission models, disconnect the
transmission fluid cooler tubing. On all models, remove fan shroud and
radiator. Remove fan and spacer or Tempatrol fan assembly. Hold fan
pulley to water pump flange using 5/16" x 1/2" SAE capscrew while
crankshaft is rotated.
5) Disconnect cruise control cable (if equipped). Disconnect\
wires from starter motor solenoid and disconnect CEC system harness.
Remove power brake vacuum check valve from booster (if equipped).
6) Disconnect power steering hoses from steering gear (if
equipped). Drain power steering pump reservoir and plug end of hoses.
Cap all fittings on steering gear and hoses. Raise and support
vehicle. Remove starter. Remove flywheel housing access cover.
7) Remove upper and loosen lower bellhousing-to-engine bolts.
Attach lifting equipment to engine. Raise engine off front mounts.
Place support under bellhousing. Remove remaining bellhousing-to-
engine bolts. Lift engine out of engine compartment.
4.2L
1) Remove battery and drain cooling system. Remove air
cleaner and engine compartment light from hood. Scribe hinge location
and remove hood. Disconnect and plug front fuel line at pump and fuel
return line at frame.
2) Disconnect heater hoses at heater. Label and disconnect
all wiring, lines, linkage and hoses at engine. Remove vacuum switch
assembly bracket from cylinder head cover. Remove both radiator hoses
and automatic transmission oil lines (if equipped) at radiator. Remove\
radiator and shroud.
3) Remove fan and spacer. Use 5/16" x 1/2" SAE bolt to hold
fan pulley to water pump flange. Remove starter and disconnect engine
ground strap. Remove engine mount-to-bracket nuts. Disconnect exhaust
pipe at manifold.
4) Discharge A/C system (if equipped). Disconnect and plug
hose or port openings at compressor. Disconnect hoses at power
steering gear and drain reservoir. Remove power brake vacuum check
valve. Remove bracket bolt for automatic transmission filler tube (if
equipped).
5) Lift and support vehicle. On models with automatic

Page 912 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual Fig. 10: Identification Label Locations Courtesy of American Motors Corp. LUBRICATION SPECIFICATIONS LUBRICATION SPECIFICATIONS TABLE\ \$

Page 928 of 1378

JEEP CHEROKEE 1988 Service Repair Manual PO W ER S TE ER IN G G EN ER AL S ER VIC IN G

1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering General Servicing
Cherokee, Comanche, Grand Wagoneer, Pickup

Page 929 of 1378

JEEP CHEROKEE 1988 Service Repair Manual PREPARATION
1) With belt tension correct, disconnect power steering pump
pressure hose. Keep hose end raised to prevent fluid loss. Connect
pressure hose of gauge to power steering p

PREPARATION
1) With belt tension correct, disconnect power steering pump
pressure hose. Keep hose end raised to prevent fluid loss. Connect
pressure hose of gauge to power steering pump fitting. Connect other
hose from valve side of tester to steering gear inlet.
2) Open valve. Run engine until fluid reaches normal
operating temperature of 170
F (77C). Check fluid level. Add fluid
(if necessary).
PRESSURE TEST
1) Note pressure reading with valve open and engine idling.
Pressure should be 80-125 psi (5.6-8.8 kg/cm).
2) If pressure is above 200 psi (14.1 kg/cm), check hoses
for restrictions and poppet valve (Saginaw gears) for proper assembly.\
3) Close gate valve completely and reopen 3 times. Record
highest reading each time. DO NOT close valve for more than 5 seconds.
If pressure is less than specification, clean or replace flow control
valve in pump. If pressures are still low, replace pump.
4) If readings are within specifications and within 50 psi
(3.5 kg/cm
) of each other, pump is operating properly. Refer to the
PRESSURE TEST SPECIFICATIONS table. If pressures are high, but do not
repeat within 50 psi (3.5 kg/cm
), flow control valve in pump is
sticking. Remove flow control valve. Clean or replace flow control
valve.
5) If pump is within specifications, open valve and turn
steering wheel from right to left stops. Record pressure. DO NOT hold
wheel against stops more than 5 seconds.
6) Pressure should measure the same as specified. See the
PRESSURE TEST SPECIFICATIONS table. If pressure is low, steering gear
is leaking internally and must be overhauled.
7) Turn steering wheel from left to right with engine idling
at 600-800 RPM. See PRESSURE TEST SPECIFICATIONS table.
8) If pressure is low, momentarily close valve. If pressure
is less than specified, pump is faulty. If pressure is within
specification but was low at previous reading, steering gear is
faulty.
PRESSURE TEST SPECIFICATIONS TABLE
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Application Idle: psi (kg/cm) Relief: psi (kg/cm)
Jeep ............... 80-125 (6-9) ............. 1400-1500 (98-105\
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Page 930 of 1378

JEEP CHEROKEE 1988 Service Repair Manual PO W ER S TE ER IN G P U M P

1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering Pumps - Saginaw Vane-Type
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer

PO W ER S TE ER IN G P U M P

1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering Pumps - Saginaw Vane-Type
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
DESCRIPTION
Saginaw vane-type power steering pump can be identified by
"ham-shaped" fluid reservoir can. Rectangular pumping vanes carried by
a shaft driven rotor move fluid from intake to pressure cavities of
cam ring.
Centrifugal force throws vanes against inside surface of cam
ring to pick up residual oil. As more oil is picked up, it is forced
into cavities of thrust plate, into 2 cross-over holes in cam ring and
pressure plate and into a high pressure area between pressure plate
and housing end plate.
Filling the high pressure area causes oil to flow under vanes
in slots of rotor. This forces vanes to follow inside oval surface of
cam ring. As vanes rotate to small area of cam ring, oil is forced out
from between vanes.
TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
LUBRICATION & TESTING
See POWER STEERING GENERAL SERVICING article in the STEERING
section.
REMOVAL & INSTALLATION
POWER STEERING PUMP
Removal & Installation
1) Loosen pump adjusting bolt (or nut) and pump mounting
bolts. Remove pump drive belt. Disconnect pressure and return hoses
from pump. Cap ends to prevent loss of fluid or contamination.
2) Remove pump bracket-to-engine bolts. Remove pump, pulley
and mounting bracket as an assembly. To install, reverse removal
procedure. Bleed system.
OVERHAUL
CAUTION: When clamping pump in vise, be careful not to exert
excessive force on front hub or pump. DO NOT use hammer to
remove pulley.
DISASSEMBLY
1) Drain pump reservoir. Clean exterior of unit. Remove
mounting bracket(s). Using a puller, withdraw pulley from shaft. See
Fig. 1 .

Page 932 of 1378

JEEP CHEROKEE 1988 Service Repair Manual hammer, tap end of drive shaft to loosen pressure plate, rotor, and
thrust plate assembly from body.
7) Lift pump body off rotor assembly. Flow control valve and
spring should slide out of bo

hammer, tap end of drive shaft to loosen pressure plate, rotor, and
thrust plate assembly from body.
7) Lift pump body off rotor assembly. Flow control valve and
spring should slide out of bore. Remove and discard end plate and
pressure plate "O" rings.
8) Using a screwdriver, pry drive shaft oil seal from body.
Lift pressure plate and cam ring from rotor. Remove rotor vanes.
9) Clamp drive shaft in soft-jawed vise, with rotor and
thrust plate facing up. Remove rotor lock ring from shaft. Use care
not to nick shaft or rotor. Slide rotor and thrust plate off shaft.
Remove shaft from vise.
CLEANING & INSPECTION
1) Clean all pump components (except drive shaft seal) in
clean solvent. Blow dry. Inspect flow control valve assembly for wear,
scoring, burrs or other damage. Inspect seal bore for burrs, nicks, or
score marks that would allow oil to by-pass outer seal surface.
2) Check all machined surfaces of body for scratches or burrs
which might allow leaks. Check "O" ring mating surfaces. Inspect pump
body drive shaft bushing for excessive wear.
3) If replacement is required, replace pump body and bushing
as an assembly. Inspect end cover "O" ring mating surface for nicks
and burrs. Polish with oil stone (if necessary).
4) Inspect rotor ring for roughness or irregularities. Use
oil stone to correct minor irregularities. Replace ring if outside cam
surface is worn or scored. Check thrust plate and pressure plate for
scoring and wear.
5) To remove light scoring, lap with crocus cloth until
surface is smooth and flat. Clean thoroughly. Check that vanes slide
freely but fit snugly into slots.
6) If vanes are loose in slots, replace rotor and/or vanes.
Scoring on rotor may be removed by lapping with crocus cloth. Clean
thoroughly.
REASSEMBLY
1) Lubricate all "O" rings, seals and seal surfaces with
power steering fluid. On Jeeps, lubricate "O" rings with petroleum
jelly. With pump on flat surface, drive new shaft seal in until it
bottoms on bore shoulder.
2) Clamp body in vise with shaft pointing down. Install end
plate and pressure plate "O" rings on body. Install body to reservoir
"O" rings. Install on pump body.
3) Place shaft, splined end up, in soft-jawed vise. Install
thrust plate on shaft with smooth, ported side up. Slide rotor,
counter bore down, over splines.
4) Install new rotor lock ring. Ensure ring is seated in
groove. Install 2 dowel pins into holes in pump cavity. Insert drive
shaft, rotor, and thrust plate assembly into pump cavity. Align
locating holes with dowel pins.
5) Slide cam ring over rotor and onto dowel pins, with arrow
on ring facing toward rear of housing. Install vanes in rotor slots
with radius edge facing out towards cam ring inner surface. Position
pressure plate on dowel pins with circular spring depression facing
rear of housing.
6) Using a 1 1/4" socket in groove of pressure plate, press
down on socket with both thumbs to seat assembly on "O" ring in pump
cavity. Place spring in groove in pressure plate. Place end cover lip
edge over spring.
7) Using thumb or arbor press, press end cover down below
retaining ring groove. Seat retaining ring in groove. Take care to
prevent cocking end cover in bore or distorting assembly.

Page 962 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50

Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)

Engine Oil (
1)

Gasoline Engine

Temperature Range

Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD

Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD

Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD

Drive Axles ................................ SAE 75W-90 API GL-5

Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5

Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5

Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid

Manual Transmission ........................ SAE 75W-90 API GL-5

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB

Door & Hood Hinges ............................ Light Engine Oil

Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP

Power Steering Pump ....................... Power Steering Fluid

Transfer Case ................................... Dexron-IIE ATF

Brake Caliper Bushings ........ GE 661 or DOW 111 Silicone Grease

Caliper Slide Pins ........... GE 661 or DOW 111 Silicone Grease

Wheel Bearings .................. Multi-Purpose NLGI Grade GC-LB

Drive Shaft U-Joints .............. Multi-Purpose NLGI Grade 2EP

Steering Linkage (
4)( 5) .................... NLGI Grade 2, GC-LB

Ball Joints (
4)( 6) ......................... NLGI Grade 2, GC-LB

Weatherstrip .......................... Silicone Spray Lubricant

Wheel Lug Nut Torque ...................... 95 ft. lbs. (129 N.m)

(
1) - SAE 10W-30 SH/CD is preferred.

(
2) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant

additive when changing fluid.

(
3) - For vehicles operating under heavy-duty towing conditions,

use SAE 75W-140 Synthetic lube.

NOTE: Before using SAE 75W-140 Synthetic the old fluid must

be DRAINED and FLUSHED with clean mineral based axle

lubricant. Then refill with new synthetic lube.

(
4) - Use low pressure grease gun to prevent seal damage.

(
5) - Fill until lubricant squeezes out from the base of seals.

(
6) - Fill ball joint until seal starts to swell.

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Fluid Capacities

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Application ( 1) Quantity

Automatic Transmission

1984-86 (904 HD)

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.0 Qts. (7.6L) \

1987-88

Fluid Change ............................... 4.0 Qts. (3.8L)

Overhaul (Dry Fill) ........................ 8.5 Qts. (8.0L) \

Cooling System (
2)

4-Cylinder .................................. 10.0 Qts. (9.5L)

6-Cylinder ................................. 12.0 Qts. (11.4L)

Engine Oil

4-Cylinder ................................... 4.0 Qts. (3.8L)

6-Cylinder ................................... 6.0 Qts. (5.7L)

Fuel Tank

Standard .................................. 13.5 Gals. (51.1L)

Optional .................................... 20 Gals. (75.7L)

Manual Transmission (
3)

AX4 (AISIN) .................................. 7.4 Pts. (3.5L) \

T4 (Borg-Warner) ............................. 3.9 Pts. (1.8L) \

Page 964 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual Inspect Front Wheel Bearings (4WD) \b\ \ \ \ \ \$

Inspect Front Wheel Bearings (4WD)

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Check Operation of Horn, Wipers/Washers & All Exterior Lights

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Inspect Condition of Wiper Blades

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Check Headlight Alignment

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Check Seat Belt Webbing and Release Mechanisms

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Check Parking Brake Operation

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Check Shift/Clutch Interlock Operation

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Lubricate Weatherstripping with Silicone

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Lubricate Door Hinges

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Lubricate Door Locks

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Check Body Drain Holes

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Rotate Tires and Adjust Air Pressure

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Replace

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Engine Oil

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Oil Filter

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Automatic Transmission Fluid, Filter and Adjust Bands

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Lubrication Specifications

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Application Specification

Automatic Transmission .......................... Dexron-IIE ATF

Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid

Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)

Engine Oil (
1)

Gasoline Engine

Temperature Range

Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD

Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD

Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD

Drive Axles ................................ SAE 75W-90 API GL-5

Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5

Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5

Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid

Manual Transmission ........................ SAE 75W-90 API GL-5

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB

Door & Hood Hinges ............................ Light Engine Oil

Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP

Power Steering Pump ....................... Power Steering Fluid

Transfer Case ................................... Dexron-IIE ATF

Brake Caliper Bushings ........ GE 661 or DOW 111 Silicone Grease

Caliper Slide Pins ........... GE 661 or DOW 111 Silicone Grease

Wheel Bearings .................. Multi-Purpose NLGI Grade GC-LB

Drive Shaft U-Joints .............. Multi-Purpose NLGI Grade 2EP

Steering Linkage (
4)( 5) .................... NLGI Grade 2, GC-LB

Ball Joints (
4)( 6) ......................... NLGI Grade 2, GC-LB

Weatherstrip .......................... Silicone Spray Lubricant

Wheel Lug Nut Torque ...................... 95 ft. lbs. (129 N.m)

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check oil jump start engine overheat center console oil type air bleeding