ABS ISUZU TROOPER 1998 Service Owner's Guide

3C – 2 FRONT SUSPENSION
GENERAL DESCRIPTION
The front suspension is designed to allow each
wheel to compensate for changes in the road
surface level without greatly affecting the opposite
wheel. Each wheel is independently connected to
the frame by a steering knuckle, ball joint
assemblies, and upper and lower control arms.
The front wheels are held in proper relationship to
each other by two outer track rods which are
connected to steering arms on the knuckles and to
a center track rod.
All models have a front suspension system
consisting of control arms, stabilizer bar, shock
absorber and a torsion bar. The front end of the
torsion bar is attached to the lower control arm.
The rear of the torsion bar is mounted into a height
control arm at the crossmember. Vehicle trim
height is controlled by adjusting this arm.
Shock absorbers are mounted between the
brackets on the frame and the lower control arms.The lower portion of each shock absorber is
attached to the lower control arm by a bolt and nut.
The upper portion of each shock absorber extends
through a frame bracket and is secured with two
rubber bushings, three retainers and a nut.
Ball joint assemblies are bolted to the outer end of
the upper and lower control arm and are attached
to the steering knuckle by nuts and cotter pins.
The inner ends of the upper control arm have
pressed in bushings. Bolts passing through the
bushing, attach the control arm to the frame. The
inner ends of the lower control arm are attached to
the frame by bolts passing through the bushings,
which are pressed in the frame.
Side roll of the front suspension is controlled by a
spring steel stabilizer bar. It is mounted in rubber
bushings, which are held to the crossmember by
brackets. The ends of the stabilizer are connected
to the lower control arms by link bolts isolated by
rubber bushings.

FRONT SUSPENSION 3C – 3
ON-VEHICLE SERVICE
SHOCK ABSORBER
Removal Steps
1. Bolt, nut and washer
2. Nut
3. Rubber bushing and washer
4. Shock absorber
5. Rubber bushing and washer
Installation Steps
5. Rubber bushing and washer
4. Shock absorber
3. Rubber bushing and washer
2. Nut
1. Bolt, nut and washer
REMOVAL
Preparation:
1) Raise the vehicle and support it with suitable safety
stands.
2) Remove wheel and tire assembly. Refer to “Wheels
and Tires” in section 3E.
1. Bolt, Nut and Washer
2. Nut
3. Rubber Bushing and Washer
4. Shock Absorber
5. Rubber Bushing and Washer
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear,
damage, corrosion or any other abnormal condition are
found through inspection.
•Shock absorber
•Rubber bushing

3C – 4 FRONT SUSPENSION
INSTALLATION
5. Rubber Bushing and Washer
4. Shock Absorber
3. Rubber Bushing and Washer
2. Nut
Shock Absorber Nut Torque N·m (kg·m/lb·ft)
20 (2.0 / 14)
1. Bolt, Nut and Washer
Shock Absorber Nut Torque N·m (kg·m/lb·ft)
82 (8.4 / 61)

3C – 10 FRONT SUSPENSION
KNUCKLE
Removal Steps
1. Torsion bar
2. Wheel speed sensor
(if equipped with ABS)
3. Back plate
4. Lower ball joint
5. Upper ball joint
6. Knuckle assembly
7. Oil seal
8. Thrust washer
9. Needle bearing
10. Knuckle
Installation Steps
10. Knuckle
9. Needle bearing
8. Thrust washer
7. Oil seal
6. Knuckle assembly
5. Upper ball joint
4. Lower ball joint
3. Back plate
2. Wheel speed sensor
(if equipped with ABS)
1. Torsion bar

FRONT SUSPENSION 3C – 11
REMOVAL
Preparation:
1) Raise the vehicle and support the frame with suitable
safety stands.
2) Remove wheel and tire assembly. Refer to “Wheels
and Tires” in section 3E.
3) Remove the brake caliper. Refer to “Brakes” in section
5.
4) Remove the hub assembly. Refer to “Hub and Disk” in
section 4C.
5) Remove outer track rod from the knuckle. Refer to
“Steering Linkage” in section 2A.
1. Torsion Bar
Loosen torsion bar by height control arm adjust bolt.
Refer to “Torsion bar” in this section.
2. Wheel speed sensor (if equipped with ABS)
3. Back Plate
4. Lower Ball Joint
Remover: 5-8840-2005-0 (J-29107)
CAUTION:
Be careful not to break the ball joint boot.
5. Upper Ball Joint
Remover: 5-8840-2121-0 (J-36831)
CAUTION:
Be careful not to break the ball joint boot.
6. Knuckle Assembly
7. Oil Seal
8. Washer
9. Needle Bearing
Remover: 5-8840-0019-0 (J-23907)

FRONT SUSPENSION 3C – 13
4. Lower Ball Joint
Tighten the nut to the specified torque, with just
enough additional torque to align cotter pin holes.
Install new cotter pin.
Lower Ball Joint Nut Torque N·m (kg·m/lb·ft)
147 (15.0 / 108)
3. Back Plate
2. Wheel Speed Sensor (if equipped with ABS)
Tighten the bolt to the specified torque.
Wheel Speed Sensor Bolt Torque N·m (kg·m/lb·in)
8 (0.8 / 69)
1. Torsion Bar
Refer to “Torsion Bar” in this section.
NOTE:
Adjust the trim height. Refer to “Front End
Alignment” in section 2A.

3C – 14 FRONT SUSPENSION
UPPER CONTROL ARM
Removal Steps
1. Speed sensor cable (if equipped with
ABS)
2. Nut and cotter pin
3. Upper ball joint
4. Bolt and plate
5. Nut assembly
6. Camber shims
7. Caster shims
8. Upper control arm assembly
9. Nut
10. Plate
11. Bushing
12. Fulcrum pin
Installation Steps
12. Fulcrum pin
11. Bushing
10. Plate
9. Nut
8. Upper control arm assembly
7. Caster shims
6. Camber shims
5. Nut assembly
4. Bolt and plate
3. Upper ball joint
2. Nut and cotter pin
1. Speed sensor cable (if equipped with
ABS)

FRONT SUSPENSION 3C – 15
REMOVAL
Preparation:
1) Raise the vehicle and support the frame with suitable
safety stands.
2) Remove wheel and tire assembly. Refer to “Wheels
and Tires” in section 3E.
3) Remove the brake caliper and disconnect flexible hose.
Refer to “Brakes” in section 5.
4) Support lower control arm with a jack.
1. Speed Sensor Cable (if equipped with ABS)
2. Nut and Cotter Pin
Remove the upper ball joint from the knuckle.
Remover: 5-8840-2121-0 (J-36831)
CAUTION:
Be careful not to break the ball joint boot.
3. Upper Ball Joint
4. Bolt and Plate
5. Nut Assembly
6. Camber Shims
Note the positions and number of shims.
7. Caster Shims
Note the positions and number of shims.
8. Upper Control Arm Assembly
9. Nut
10. Plate
11. Bushing
Remover: 5-8840-0256-0 (J-29755)
12. Fulcrum Pin

FRONT SUSPENSION 3C – 17
8. Upper Control Arm Assembly
Install upper control arm assembly with the fulcrum
pin projections turned inward.
7. Caster Shims
Install the caster shims between the chassis frame and
fulcrum pin.
6. Camber Shims
Install the camber shims between the chassis frame
and fulcrum pin.
5. Nut Assembly
4. Bolt and Plate
Fulcrum Pin Bolt Torque N·m (kg·m/lb·ft)
152 (15.2 / 112)
3. Upper Ball Joint
Upper Ball Joint Nut Torque N·m (kg·m/lb·ft)
57 (5.8 / 42)
2. Nut and Cotter Pin
Tighten the nut to the specified torque, with just
enough additional torque to align cotter pin holes.
Install new cotter pin.
Upper Ball Joint Nut Torque N·m (kg·m/lb·ft)
98 (10.0 / 72)
1. Speed Sensor Cable (if equipped with ABS)

3C – 18 FRONT SUSPENSION
LOWER CONTROL ARM
Removal Steps
1. Nut and washer, front
2. Nut and washer, rear
3. Torsion bar
4. Torsion bar arm
5. Stabilizer link
6. Shock absorber
7. Lower ball joint
8. Bolt, front
9. Bolt, rear
10. Lower control arm
11. Bolt, torsion bar arm
12. Bolt, lower ball joint
13. Bushing, front
14. Bushing, rear
Installation Steps
14. Bushing, rear
13. Bushing, front
12. Bolt, lower ball joint
11. Bolt, torsion bar arm
10. Lower control arm
9. Bolt, rear
8. Bolt, front
7. Lower ball joint
6. Shock absorber
5. Stabilizer link
4. Torsion bar arm
3. Torsion bar
2. Nut and washer, rear
1. Nut and washer, front