1988 JEEP CHEROKEE power steering

 Rear ......................................... 2.5 Pts. (1.2L) 

Rear (Trac-Lok) (
4) .......................... 2.5 Pts. (1.2L) 



(
1) - Capacities are recommended or calculated levels. Always use 

dipstick (if available) to measure level. 

(
2) - Includes 2.3 qts. for coolant recovery bottle. 

(
3) - Fill to bottom of filler plug hole. 

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

additive first, then add new fluid. 










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Service Labor Times 










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Application Hours 



2.5L 

Automatic Transmission ................................... 3.5 

Manual Transmission ...................................... 3.5 

2.8L 

Automatic Transmission ................................... 3.7 

Manual Transmission ...................................... 3.7 

4.0L 

Automatic Transmission ................................... 3.6 

Manual Transmission ...................................... 3.6 










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LUBRICATION SPECIFICATIONS
LUBRICATION SPECIFICATIONS TABLE








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Application Fluid Specifications
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
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 ........... Mopar Multi-Purpose NLGI Grade GC-LB
Drive Shaft U-Joints ....... Mopar Multi-Purpose NLGI Grade 2EP
Steering Linkage ( 4)( 5) ...... Mopar Multi-mileage or equivalent
Ball Joints ( 4)( 6) ........... Mopar Multi-mileage or equivalent
Weatherstrip ......................... Silicone Spray Lubricant
( 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

\003STE ER IN G G EA R - P O W ER

1988 J e ep C hero ke e
1987-88 STEERING
Jeep Power Steering Gears - Saginaw Rotary Valve
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
DESCRIPTION
Steering gear is a recirculating ball-type, available in
either a constant or a variable ratio design. Steel balls form a
"rolling thread" between steering gear worm shaft and rack/piston nut.
Worm shaft thrust is absorbed by a thrust bearing and two races at
lower end, and by a bearing in adjuster plug at upper end.
This design puts spring pressure on worm shaft to ensure
proper thrust bearing preload. Adjuster plug provides initial preload
adjustment and service adjustment (when repairing gear). As worm shaft\
is turned right, rack/piston is moved upward in gear.
As worm shaft is turned left, rack/piston is moved downward
in gear. The rack/piston teeth mesh with sector, which is forged as
part of sector shaft. Rotating worm shaft moves sector shaft, which
turns wheels through mechanical linkage. See Fig. 1.
TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
LUBRICATION
See POWER STEERING GENERAL SERVICING article.
TESTING
See POWER STEERING GENERAL SERVICING article.

Fig. 1: Exploded View of Saginaw Rotary Valve Power Steering Gear
ADJUSTMENTS
THRUST BEARING PRELOAD ADJUSTMENT
1) Remove steering gear from vehicle. Remove adjuster plug
lock nut. Turn adjuster plug clockwise with a spanner wrench until
plug is seated in housing. This will require 20-30 ft. lbs. (27-41 N.
m) of torque.
2) Place an index mark on housing opposite one spanner wrench
hole in adjuster plug. Measure 1/2" (13 mm) counterclockwise from mark\
and again mark housing. Rotate plug counterclockwise until hole in
adjuster lines up with second mark.
3) Tighten lock nut. Ensure adjuster remains in position.
Attach an INCH lb. torque wrench to end of input shaft. Turn input
shaft to right stop, then back 1/4 turn.
4) Using torque wrench measure rotational torque required to
turn shaft. Reading should be taken with beam of torque wrench near
vertical while turning it counterclockwise at an even rate. Torque
reading should be 4-10 INCH lbs. (.4-1.1 N.m). See. Fig. 2.

shaft from side to side through specified arc on each side of center.
See OVER-CENTER PRELOAD chart. Note torque reading going over center.
Adjust thrust bearing preload before over-center preload. See Fig. 3.
OVER-CENTER PRELOAD SPECIFICATIONS - INCH LBS. (N.m)









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Application Arc Over-Center (1) Total
New Gears .......... 45
 ........ 4-8 (.4-.9) ......... 14 (1.5)
Used Gears ( 2) ..... 45 ........ 4-5 (.5-.6) ......... 14 (1.5)
( 1) - Total preload is sum of thrust bearing and over-center preload.
( 2) - In service for more than 400 miles (640 km.).









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Fig. 3: Adjusting Over-Center Preload
REMOVAL & INSTALLATION
POWER STEERING PUMP
Removal & Installation
1) Loosen and remove pump drive belt. Disconnect pressure and
return hoses from pump. Cap ends to prevent loss of fluid or
contamination.
2) Remove bracket-to-engine bolts. Remove pump and mounting
bracket as an assembly. To install, reverse removal procedure. Fill
and bleed system.

Fig. 4: Power Steering Pump (Cherokee & Commanche)

Fig. 5: Front Bracket Boltsp (Cherokee & Commanche)
STEERING GEAR
Removal
1) Remove collapsible steering column. Raise and support
vehicle. Place drain pan under steering gear assembly. Center steering
gear. Disconnect hydraulic hoses from gear and cap ends. Disconnect
steering linkage from pitman arm. Remove pitman arm from gear.
2) Remove flexible coupling clamp bolt and bolts retaining
steering gear to frame. Disconnect gear from flexible coupling and
remove gear from vehicle. On Jeep CJ7 and Scrambler models, remove
steering gear and mounting bracket as an assembly.
Installation
To install, reverse removal procedure. Fill pump reservoir.
Bleed air from system. See POWER STEERING GENERAL SERVICING article.

OVERHAUL
SUBMERGED VANE POWER STEERING PUMP
Disassembly
1) Drain pump reservoir. Clean exterior of unit. Measure
distance shaft protrudes from pulley, and record for assembly
reference. Using pulley remover, remove pulley from shaft. Clamp pump
in vise; DO NOT overtighten vise. Remove pressure line union,
reservoir mounting stud and reservoir. See Fig. 6. Remove and discard
pressure line union "O" rings.
Fig. 6: Exploded View of Pump Assembly (Grand Wagoneer & Wrangler)
Courtesy of Chrysler Motors
2) Using punch and screwdriver, remove end plate retaining
ring. Remove end plate and pressure plate spring. Remove "O" ring,
flow control valve and spring. Note direction of pump ring
installation for reassembly reference.
3) Using soft-faced hammer, tap end of drive shaft to loosen
pressure plate. Remove pressure plate, pump ring, vanes, retaining
ring, rotor and thrust plate assembly from body. Remove drive shaft.
Using a screwdriver, pry drive shaft oil seal from housing. Remove
dowel pins and seals.
Cleaning & Inspection
1) Clean all pump components in solvent, and blow dry.
Inspect flow control valve assembly for wear, scoring, burrs and other
damage. Inspect seal bore for burrs, nicks and score marks.
2) Inspect machined surfaces of body for scratches and burrs.
Check "O" ring mating surfaces. Inspect drive shaft for excessive
wear.
3) Inspect pump ring for roughness. Check thrust plate and
pressure plate for scoring and wear. Ensure vanes slide freely but fit
snugly into slots. If vanes are loose in slots, replace rotor and/or
vanes.
Reassembly
1) Before installation, coat all "O" rings, rotor, pressure

plate and end plate with petroleum jelly. Install new drive shaft seal
in housing. Install "O" ring in third groove of housing. Install dowel
pins in thrust plate. Install drive shaft through thrust plate and
rotor. Install NEW retaining ring. Ensure rotor slides freely on drive
shaft splines.
2) Install drive shaft in pump housing. Ensure thrust plate
engages with dowel pins. Install pump ring on dowel pins with rotation
arrow facing upward. Install vanes with rounded edges toward pump
ring.
3) Lubricate outer chamfered edge of pressure plate with
petroleum jelly. Install pressure plate with spring groove facing
upward. To seat pressure plate, place large socket on pressure plate
and press downward approximately 1/16".
4) Install end plate "O" ring in second groove of housing.
Install pressure plate spring and end plate in housing. Press end
plate downward, and install retaining ring. Install "O" ring, flow
control valve and spring.
5) Install mounting stud and pressure line union "O" rings in
rear of pump housing. Lubricate inner edge of reservoir with petroleum
jelly, and install. Install mounting stud. Tighten stud to
specification. Install pressure line union, and tighten to
specification. See appropriate table under TORQUE SPECIFICATIONS.
6) Using Pump Pulley Installer (J-25033-B), install pulley o\
n
pump shaft. Ensure shaft protrudes distance measured in disassembly
procedure.
7) When replacing plastic pulley with metal pulley, install
pulley flush with end of shaft. Install pump on engine, and compare
alignment with adjacent pulleys. If necessary, correct alignment by
using pump pulley installer to adjust shaft protrusion.
NON-SUBMERGED VANE POWER STEERING PUMP
Disassembly
1) Remove return tube. Clean exterior of unit. Measure
distance shaft protrudes through pulley, and record for reassembly
reference. Using pulley remover, remove pulley from shaft. Remove
fitting, "O" ring, flow control valve and spring. See Fig. 7.
2) Remove snap ring, drive shaft and bearing. Note direction
of snap ring installation for reassembly reference. Support drive
shaft bearing on inner race, and press drive shaft from bearing. Using
screwdriver, remove drive shaft seal from housing.
3) Insert punch into access hole to disengage and remove
retaining ring. Using a brass drift, tap on thrust plate, and remove.
Remove "O" ring, pump ring, rotor and vanes. Remove dowel pins,
pressure plate, "O" ring and pressure plate spring. Remove "O" ring,
dowel pin and sleeve.
Fig. 7: Exploded View of Cherokee & Comanche Pump Assembly
Courtesy of Chrysler Motors