93ZJ-Secc-3-Rear-Suspension-and-Axle.pdf

REAR SUSPENSION AND AXLES 3 - 1

REAR SUSPENSION AND AXLES

CONTENTS

page

AXLE NOISE/VIBRATION DIAGNOSIS ......... 6

GENERAL INFORMATION .................. 1

MODEL 35 AXLE ........................ 10

REAR SUSPENSION ...................... 3

TORQUE SPECIFICATIONS ................ 32

TRAC-LOK DIFFERENTIAL ................ 27

GENERAL INFORMATION

REAR SUSPENSION

The Grand Cherokee rear suspension is link/coil

design comprised of (Fig. 1);

Drive axle

The upper suspension arm uses cam bolts at the axle

to allow for pinion angle adjustment. The cams are

available as a service kit and are not installed at the

factory. The suspension arm travel (jounce or re-

bound) is limited through the use rubber bumpers.

All suspension components that use rubber bush-

ings should be tightened with the vehicle at the nor-

mal height. If the springs are not at normal ride

position, vehicle ride comfort could be affected. Rub-

ber bushings must never be lubricated.

The vehicles use coil springs mounted up in the

fender shield that is part of the unitized body bracket.

There is a rubber doughnut isolator between the top

of the spring and bracket to isolate road noise. The

bottom of the spring seats on the axle pad and is

retained with a clip.

Ride control is accomplished through the use of

dual-action shock absorbers. The shocks dampen

jounce and rebound as the vehicle travels over vari-

ous road conditions. The top of the shock absorbers

are bolted to the frame brackets. The bottom of the

shocks are bolted to the axle brackets.

The stabilizer bar is used to minimize vehicle rear

sway during turns. The spring steel bar helps to

equalize the vehicle body in relationship to the sus-

pension. The bar extends across the underside of the

chassis and connects to the frame rails. The links are

connected to the axle brackets. All mounting points of

the stabilizer bar are isolated by rubber bushings.

The track bar is used to minimize rear axle side-to-

side movement. The track bar is attached to the

frame rail bracket with a ball stud and isolated with

a bushing at the axle bracket.

Coil springs

Upper and lower suspension arms

Dual-action shock absorbers

Track bar

Stabilizer bar

Jounce bumpers (used to limit the travel of the

suspension)

Fig. 1 Rear Suspension

REAR AXLE

The integral housing, hypoid design has the pinion

set below the ring gear.

The axles are equipped with A.B.S. brake systems.

The A.B.S. tone rings are pressed onto the axle shaft

The upper and lower suspension arms use bushings

to isolate road noise. The suspension arms are bolted

to the frame and axle through the rubber bushings.

3 - 2 REAR SUSPENSION AND AXLES

near the hub flange. For additional information on

the A.B.S. system refer to Group 5, Brakes.

The Model 35 axle has the assembly part number

and gear ratio listed on a tag. The tag is attached to

the housing cover (Fig. 2). Build date identification

codes are stamped on the axle shaft tube cover side.

The Model 35 axle is available with Trac-lok (lim-

ited slip) differential as an option.

Fig. 3 Differential Operation—Straight-Ahead

Driving

Fig. 2 Model 35 Differential Cover

occurs because input torque applied to the gears is

divided and distributed equally between the two side

gears. As a result, the pinion gears revolve with the

pinion mate shaft but do not rotate around it (Fig. 3).

When turning corners, the outside wheel must

travel a greater distance than the inside wheel in

order to complete a turn. This difference must be

compensated for in order to prevent the wheels from

scuffing and skidding through the turn. To accomplish

this, the differential becomes effective allowing the

axle shafts to turn at unequal speeds (Fig. 4). In this

instance, the input torque applied to the pinion gears

is not divided equally. The pinion gears now rotate

around the pinion mate shaft in opposite directions.

This allows the side gear and axle shaft attached to

the outside wheel to rotate at a faster speed.

STANDARD DIFFERENTIAL OPERATION

The differential gear system divides the torque be-

tween the axle shafts. It allows the axle shafts to

rotate at different speeds when turning corners.

Each differential side gear is splined to an axle

shaft. The pinion gears are mounted on a pinion mate

shaft and are free to rotate on the shaft. The pinion

gear is fitted in a bore in the differential case and is

positioned at a right angle to the axle shafts.

In operation, power flow occurs as follows:

Pinion gear rotates the ring gear

Ring gear (bolted to the differential case) rotates

the case

Differential pinion gears (mounted on the pinion

mate shaft in the case) rotate the side gears

Side gears (splined to the axle shafts) rotate the

shafts

During straight-ahead driving, the differential pin-

ion gears do not rotate on the pinion mate shaft. This

Fig. 4 Differential Operation—On Turns

REAR SUSPENSION AND AXLES 3 - 3

REAR SUSPENSION

INDEX

page

Coil Spring ............................. . 4

Lower Suspension Arm .................... . 4

Service Information ....................... . 3

Shock Absorber .......................... . 4

Spring and Shock Diagnosis .................. 4

Stabilizer Bar ............................ . 3

Track Bar .............................. . 3

Upper Suspension Arm .................... . 4

SERVICE INFORMATION

INSTALLATION

(1) Install the track bar to the axle bracket and

install the bolt (Fig. 1).

(2) It may be necessary to pry the axle assembly

over to install the track bar. Install the track bar to

the frame rail bracket. Loosely install the bolt and

flag nut (Fig. 1).

(3) Remove the supports and lower the vehicle.

(4) Tighten the bolt at the axle shaft tube bracket

to 100 N

CAUTION: All suspension components that use rub-

ber bushings should be tightened with the vehicle at

the normal height. Have the springs supporting the

weight of vehicle when fasteners are torqued. If the

springs are not at their normal ride position, vehicle

ride comfort could be affected. Rubber bushings

must never be lubricated.

m (74 ft. lbs.) torque.

(5) Tighten the nut at the frame rail to 100 N

TRACK BAR

(74 ft. lbs.) torque.

REMOVAL

(1) Raise and support the vehicle.

(2) Remove the bolt and nut from the frame rail

bracket (Fig. 1).

STABILIZER BAR

REMOVAL

(1) Raise and support the vehicle. Remove one

wheel and tire.

(2) Disconnect the stabilizer bar links from the axle

brackets (Fig. 2).

(3) Lower the exhaust by disconnecting the muffler

and tail pipe hangers.

(4) Disconnect the stabilizer bar from the links.

(5) Disconnect the stabilizer bar clamps from the

frame rails. Remove the stabilizer bar.

Fig. 1 Rear Track Bar

(3) Remove the bolt from the axle tube bracket

(Fig. 1). Remove the track bar.

Fig. 2 Rear Stabilizer Bar

3 - 4 REAR SUSPENSION AND AXLES

INSTALLATION

(1) Position the stabilizer bar on the frame rail and

install the clamps and bolts. Ensure the bar is cen-

tered with equal spacing on both sides. Tighten the

bolts to 54 N

LOWER SUSPENSION ARM

m (40 ft. lbs.).

(2) Install the links and grommets onto the stabi-

lizer bar and axle brackets (Fig. 2). Install the nuts

and tighten to 36 N

REMOVAL

(1) Raise and support the vehicle.

(2) Remove the lower suspension arm nut and bolt

at the axle bracket (Fig. 3).

(3) Remove the nut and bolt (Fig. 3) at the frame

rail and remove the lower suspension arm.

m (27 ft. lbs.) torque.

(3) Connect the muffler and tail pipe to their hang-

ers.

(4) Install the wheel and tire.

INSTALLATION

(1) Position the lower suspension arm at the axle

bracket and frame rail bracket (Fig. 3).

(2) Install the bolts and finger tighten the nuts

(Fig. 3).

(3) Remove the supports and lower the vehicle.

(4) Tighten the nut at the axle bracket to 177 N

UPPER SUSPENSION ARM

REMOVAL

(1) Raise and support the vehicle.

(2) Remove the upper suspension arm nut and bolt

at the axle bracket (Fig. 3). Remove the ABS wire

bracket from the arm.

(3) Remove the nut and bolt (Fig. 3) at the frame

rail and remove the upper suspension arm.

(130 ft. lbs.) torque.

(5) Tighten the bolt at the frame rail to 177 N

(130 ft. lbs.) torque.

SPRING AND SHOCK DIAGNOSIS

A squeak noise from the shock absorber can be

produced if movement between the rubber bushings

and the metal occurs. This noise can usually be

stopped by tightening the attaching nuts. If the

squeak noise persists, inspect for damaged and worn

bushings, and attaching components. Repair as neces-

sary if any of these conditions exist.

The shock absorbers are not refillable or adjustable.

If a malfunction occurs, the shock absorber must be

replaced. To test a shock absorber, hold it in an up-

right position and force the piston into and out of the

cylinder four or five times. The action throughout

each stroke should be smooth and even.

SHOCK ABSORBER

REMOVAL

(1) Remove the upper nut and retainer from the

frame rail stud (Fig. 4).

(2) Remove the lower nuts and bolts from the axle

bracket. Remove the shock absorber.

Fig. 3 Upper and Lower Suspension Arms

INSTALLATION

(1) Install the shock absorber on the upper frame

rail stud. Install the shock absorber on the axle

bracket (Fig. 4).

(2) Install the retainer and nut on the stud.

Tighten the upper nut to 70 N

INSTALLATION

(1) Position the upper suspension arm at the axle

and frame rail (Fig. 3).

(2) Install the bolts and finger tighten the nuts

(Fig. 3). Install the ABS wire bracket onto the arm.

(3) Remove the supports and lower the vehicle.

(4) Tighten the nut at the axle bracket to 75 N

m (52 ft. lbs.) torque.

(3) Tighten the lower nut to 92 N

m (68 ft. lbs.)

torque.

COIL SPRING

(55 ft. lbs.) torque.

(5) Tighten the nut at the frame rail to 75 N

m (55

REMOVAL

(1) Raise and support the vehicle. Position a hy-

draulic jack under the axle to support it.

(2) Disconnect the stabilizer bar link and shock

absorber from the axle bracket.

ft. lbs.) torque.

REAR SUSPENSION AND AXLES 3 - 5

(3) Disconnect the track bar from the frame rail

bracket.

(4) Lower the axle until the spring is free from the

upper mount seat. Remove the coil spring clip screw

(Fig. 4) and remove the spring.

m (16 ft. lbs.) torque.

(2) Raise the axle into position until the spring

seats in the upper mount.

(3) Connect the stabilizer bar links and shock ab-

sorbers to the axle bracket. Connect the track bar to

the frame rail bracket.

(4) Remove the supports and lower the vehicle.

Fig. 4 Rear Coil Spring & Shock Absorber

INSTALLATION

(1) Position the coil spring on the axle pad. Install

the spring clip and screw (Fig. 4). Tighten the screw

to 22 N

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: