tires ISUZU TROOPER 1998 Service Repair Manual

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THIS MALUAL INCLUDES THE FOLLOWING SECTIONS:
SECTION No. CONTRNTS
3C FRONT SUSPENSION
3D REAR SUSPENSION; COIL SPRING
3E WHEELS AND TIRES

Problem Possible Cause Correction
00 – 4 SERVICE INFORMATION
GENERAL INFORMATION
Since the problems in steering, suspension,
wheels and tires involve several systems, they
must all be considered when diagnosing a
complaint. To identify the symptom, always road
test the vehicle first.
Proceed with the following preliminary inspections
and correct any defects which are found.1. Inspect tires for proper pressure and uneven
wear.
2. Raise vehicle on a hoist and inspect front and
rear suspension and steering linkage for loose
or damaged parts.
3. Spin front wheels. Inspect for out-of-round
tires, out-of-balance tires, loose and/or rough
wheel bearings.
GENERAL TROUBLESHOOTING
Vehicle Pulls
Abnormal or Excessive
Tire Wear
Shimmy, Shake or
Vibration1. Mismatched or uneven tires.
2. Tires not adequately inflated.
3. Broken or sagging springs.
4. Radial tire lateral force.
5. Improper wheel alignment.
6. Brake dragging in one wheel.
7. Loose, bent or broken front or rear
suspension parts.
8. Faulty shock absorbers.
1. Sagging or broken spring.
2. Tire out of balance.
3. Improper wheel alignment.
4. Faulty shock absorber.
5. Hard driving.
6. Overloaded vehicle.
7. Tires not rotated periodically.
8. Worn or loose road wheel bearings.
9. Wobbly wheel or tires.
10. Tires not adequately inflated.
1. Tire or wheel out of balance.
2. Loose wheel bearings.
3. Worn steering linkage ball joints.
4. Worn upper or lower end ball joints.
5. Excessively upper wheel runout.
6. Blister or bump on tire.
7. Excessive loaded radial run out of
tire/wheel assembly.
8. Improper wheel alignment.
9. Loose or worn steering linkage.
10. Loose steering gear.
11. Tires not adequately inflated.
12. Loose, bent or broken front or rear
suspension parts.
13. Faulty shock absorber.
14. Hub bearing preload misadjustment.Replace tire.
Adjust tire pressure.
Replace spring.
Replace tire.
Adjust wheel alignment.
Repair brake.
Tighten or replace the
appropriate suspension part(s).
Replace shock absorber.
Replace spring.
Balance or replace tire.
Check front end alignment.
Replace shock absorber.
Replace tire.
Replace tire and reduce load.
Replace or rotate tire.
Replace wheel bearing.
Replace wheel or tire.
Adjust the pressure.
Balance wheels or replace
tire/or wheel.
Replace wheel bearing.
Replace ball joints.
Replace ball joints.
Repair or replace wheel
and/or tire.
Replace tire.
Replace tire or wheel.
Check wheel alignment.
Tighten or replace steering
linkage.
Tighten housing bolts.
Adjust tire pressure.
Tighten or replace the
appropriate suspension parts.
Replace shock absorber.
Adjust preload.

SERVICE INFORMATION 00 – 5
Problem Possible Cause Correction
GENERAL TROUBLESHOOTING (CONT.)
Wheel Tramp or Hop
Hard Steering
Too Much Play In
Steering
Poor Steering Wheel
Returnability
Abnormal Noise1. Blister or bump on tire.
2. Improper shock absorber operation
1. Bind in steering linkage ball studs,
upper or lower end ball joint.
2. Improper wheel alignment.
3. Steering gear misadjustment.
4. Tire not adequately inflated.
5. Bind in steering column or shaft.
6. Improper power steering system
operation.
1. Wheel bearings worn.
2. Loose steering gear or linkage.
3. Steering gear misadjustment.
4. Worn or loose steering shaft universal
joint.
5. Worn steering linkage ball joints.
6. Worn upper or lower end ball joints.
1. Bind in steering linkage ball joints.
2. Bind in upper or lower end ball joints.
3. Bind in steering column and shaft.
4. Bind in steering gear.
5. Improper wheel alignment.
6. Tires not adequately inflated.
7. Loose steering wheel nut.
8. Worn wheel bearing.
1. Worn, sticky or loose upper or lower
end ball joint, steering linkage ball
joints or drive axle joints.
2. Faulty shock absorbers.
3. Worn upper or lower control arm bushing.
4. Loose stabilizer bar.
5. Loose wheel nuts.
6. Loose suspension bolts or nuts.
7. Broken or otherwise damaged wheel
bearings.
8. Broken suspension springs.
9. Loose steering gear.
10. Faulty steering gear.Replace tire.
Replace shock absorber.
Replace ball joints.
Check wheel alignment.
Check and adjust steering gear
preload.
Inflate tires to proper pressure.
Repair or replace.
Repair or replace.
Refer to "Power steering
system troubleshooting."
Replace wheel bearings.
Retighten or repair.
Inspect and adjust steering
gear preload.
Retighten or replace steering
shaft.
Replace ball joints.
Replace ball joints.
Replace ball joints.
Replace ball joints.
Repair or replace.
Check and repair steering gear.
Adjust wheel alignment.
Adjust tire pressure.
Retighten.
Replace.
Replace.
Replace or repair.
Replace.
Retighten bolts.
Tighten nuts. Check for
elongated wheel nut holes.
Replace wheel if required.
Retighten suspension bolts or
nuts.
Replace wheel bearing.
Replace spring.
Retighten mounting bolt.
Check and adjust steering gear.

00 – 6 SERVICE INFORMATION
Problem Possible Cause Correction
GENERAL TROUBLESHOOTING (CONT.)
Wandering or Poor
Steering Stability
Erratic Steering When
Bracking
Low or Uneven Trim
Height
Suspension Bottoms
Body Leans
Cupped Tires1. Mismatched or unevenly worn tires.
2. Loose steering linkage ball joints.
3. Faulty shock absorbers.
4. Loose stabilizer bar.
5. Broken or sagging springs.
6. Steering gear misadjustment.
7. Improper wheel alignment.
1. Worn wheel bearings.
2. Broken or sagging springs.
3. Leaking caliper.
4. Warped discs.
5. Badly worn brake pads.
6. Tires are inflated unequally.
1. Broken or sagging springs.
2. Vehicle overloaded.
3. Incorrect springs.
1. Vehicle overloaded.
2. Faulty shock absorber.
3. Incorrect, broken or sagging springs.
1. Loose stabilizer bar.
2. Faulty shock absorbers, struts or
mounting.
3. Broken or sagging springs.
4. Vehicle overloaded.
1. Worn wheel bearings.
2. Excessive tire or wheel runout.
3. Worn ball joints.
4. Tire out of balance.Replace tire or inflate tires to
proper pressure.
Replace ball joints.
Replace shock absorber.
Tighten or replace stabilizer bar
or bushings.
Replace spring (pairs).
Check or adjust steering gear.
Adjust wheel alignment.
Replace wheel bearings.
Replace spring (pairs).
Repair or replace caliper.
Replace brake disc.
Replace brake pads.
Inflate tires to proper pressure.
Replace springs (In pairs)
Reduce load.
Adjust or replace torsion bar.
Reduce load.
Replace shock absorber.
Replace springs.
Tighten stabilizer bar bolts or
replace bushings.
Replace shock absorber.
Replace springs (In pairs)
Reduce load.
Replace wheel bearings.
Replace tire or wheel.
Replace ball joints.
Adjust tire balance.

00 – 14 SERVICE INFORMATION
STEERING WHEEL FREE PLAY
ADJUSTMENT
INSPECTION
1. Check the amount of steering wheel play by turning
the wheel in both directions until the tires begin to
move with the front wheels properly in the straight
ahead position.
NOTE:
The wheel free play should be checked with the engine
running.
Steering Wheel Free Play mm (in)
0 – 30 (0 – 1.18)
2. Also check the steering wheel for play and looseness
in mount by moving it back and froth and sideways.
While driving, check for hard-steering, steering
shimmy and tendency to pull to one side.
ADJUSTMENT
1. Align the front wheels properly in the straight ahead
position.
2. Loosen the lock nut on the adjusting screw of the
steering gear.
3. Turn the adjust screw clockwise to decrease free play
or counter-clockwise to increase.
4. After check of specified free play, tighten the lock nut
to specified torque.
Lock Nut Torque N·m (kg·m/lb·ft)
41 (4.2 / 30)

2A – 2 FRONT END ALIGNMENT
GENERAL DESCRIPTION
“Front End Alignment” refers to the angular relationship between the front wheels, the front suspension
attaching parts and the ground.
Proper front end alignment must be maintained in order to insure efficient steering, good directional
stability and to prevent abnormal tire wear.
The most important factors of front end alignment are wheel toe-in, wheel camber and axle caster.
DEFINITION OF TERMS
CAMBER
Camber is the inward or outward tilting of the front wheels
from the vertical. When the wheels tilt outward at the top,
the camber is positive (+). When the wheels tilt inward at
the top, the camber is negative (–). The amount of tilt
measured in degrees from the vertical is called the camber
angle.
If camber is extreme or unequal between the wheels,
improper steering and excessive tire wear will result.
Negative camber causes wear on the inside tire, while
positive camber causes wear to the outside.
CASTER
Caster is the tilting of the wheel axis either forward or
backward from the vertical (when viewed from the side of
the vehicle). A backward tilt is positive(+) and a forward tilt
is negative(–).
On the short and long arm type suspension you cannot
see a caster angle without a special instrument, but if you
look straight down from the top of the upper control arm
to the ground, the ball joints do not line up (fore and aft)
when a caster angle other than 0 degree is present. With a
positive angle, the lower ball joint would be slightly ahead
(toward the front of the vehicle) of the upper ball joint
center line.
TOE-IN
Toe-in is the turning of the front wheels. The actual
amount of toe-in is normally a fraction of a degree. Toe-in
is measured from the center of the tire treads or from the
inside of the tires. The purpose of toe-in is to insure
parallel rolling of the front wheels and to offset any small
deflections of the wheel support system which occurs
when the vehicle is rolling forward. Incorrect toe-in results
in excessive toe-in and unstable steering. Toe-in is the last
alignment to be set in the front end alignment procedure.

INSPECTION
Before making any adjustments affecting caster, camber
or toe-in, the following front end inspection should be
made.
INSPECT
1. Tires for proper inflation pressure. Refer to “Wheels
and Tires” in section 3E.
2. Front wheel bearings for proper adjustment. Refer to
“Front Wheel Drive” in section 4C.
3. Ball joints, tie rod ends and relay rods. If excessive
looseness is noted, correct before adjusting. Refer to
“Steering Linkage” in section 2A.
4. Wheel and tires for run-out. Refer to “Wheels and
Tires”in section 3E.
5. Trim height. If not within specifications, the
correction must be made before adjusting caster.
6. Steering gear for looseness at the frame.
7. Shock absorbers for leaks or any noticeable noise.
Refer to “Front Suspension” in section 3C.
8. Control arms or stabilizer bar attachment for
looseness. Refer to “Front Suspension“ in section 3C.
9. Alignment equipment. Follow the manufacturer’s
instructions.
10. Level of the vehicle. The vehicle must be on a level
surface.
TRIM HEIGHT ADJUSTMENT
Adjust the trim height by means of the adjusting bolt on
the height control arms.
CAUTION:
When adjusting front end alignment, be sure to begin
with trim height as trim height adjustment may change
other adjusted alignments.
1. Check and adjust the tire inflation pressures.
2. Park the vehicle on a level ground and move the front
of the vehicle up and down several times to settle the
suspension.
3. Make necessary adjustment with the adjusting bolt
on the height control arms.
Trim Height(Z) mm(in)
139 ± 5 (5.47 ± 0.2)FRONT END ALIGNMENT 2A – 3
ON-VEHICLE SERVICE

STEERING LINKAGE 2A – 47
REMOVAL
Preparation:
Remove wheel and tire assembly.
Refer to “Wheels and Tires” in section 3E.
1. Nut and Cotter Pin, Center Track Rod
Disconnect outer track rod assembly at the center
track rod.
Remover: 5-8840-2121-0 (J-36831)
CAUTION:
Be careful not to break the ball joint boot.
2. Nut and Cotter Pin, Knuckle Arm
Remove outer track rod assembly from the knuckle
arm.
Remover: 5-8840-2121-0 (J-36831)
CAUTION:
Be careful not to break the ball joint boot.
3. Lock Nut, Outer
NOTE:
In either outer rod, the screw on the right side of the
vehicle is threaded counterclockwise.
6. Rod End, Inner
Apply setting marks to ensure reassembly of the
parts in their original position.
4. Rod End Assembly, Outer
Apply setting marks to ensure reassembly of the
parts in their original position.
5. Lock Nut, Inner
NOTE:
In either outer rod, the screw on the right side of the
vehicle is threaded counterclockwise.

2A Ð 62 SUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL & COLUMN
Use special tool. Remove the steering wheel.
Move the tires to the straight ahead position before
removing the steering wheel.
Steering wheel remover: 5-8840-0016-0 (J-29752)
CAUTION:
Never apply force to the steering wheel in direction of the
shaft by using a hammer or other impact tools in an
attempt to remove the steering wheel. The steering shaft
is designed as an energy absorbing unit.
6. Steering Column Cover
7. Combination Switch and SRS Coil Assembly
1) Disconnect the wiring harness connectors
located under the steering column.
2) Remove the combination switch assembly with
SRS coil.
NOTE:
The SRS coil is a part of the combination switch
assembly, which can not be replaced separately.
Therefore, be sure not to remove the SRS coil from
the combination switch assembly.
825RS046
INSTALLATION
Alignment mark
7. Combination Switch and SRS Coil Assembly
1) After installation of combination switch
assembly, connect the combination switch
wiring harness connector and the SRS 2way
connector located under the steering column.
2) Turn the SRS coil counterclockwise to full, return
about 3 turns and align the neutral mark.
CAUTION:
When turning the SRS coil counterclockwise to full, stop
turning if resistance is felt. Forced further turning may
damage to the cable in the SRS coil.
826RW027
Starter switch
harness
Combination
switch harness
Inflator module
harness
Setting cowl
(Lower)
6. Steering Column Cover
When installing the steering column cover, be sure to
route each wire harness as illustrated so that the
harnesses do not catch on any moving parts.
825RS048

2A – 66 SUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL & COLUMN
5. Steering Wheel
Apply a setting mark across the steering wheel and
shaft so parts can be reassembled in their original
position.
Use special tool. Remove the steering wheel.
Move the tires to the straight ahead position before
removing the steering wheel.
Steering wheel remover: 5-8840-0016-0 (J-29752)
CAUTION:
Never apply force to the steering wheel in direction of
the shaft by using a hammer or other impact tools in an
attempt to remove the steering wheel. The steering
shaft is designed as an energy absorbing unit.
6. Steering Column Cover
7. Combination Switch and SRS Coil Assembly
1) Disconnect the wiring harness connectors
located under the steering column.
2) Remove the combination switch assembly with
SRS coil.
NOTE:
The SRS coil is a part of the combination switch
assembly, which can not be replaced separately.
Therefore, be sure not to remove the SRS coil from
the combination switch assembly.
8. Snap Ring
9. Cushion Rubber
10. Shift Lock Cable (for A/T)
11. Lock Cylinder Assembly
Disconnect the starter switch harness connector
located under the steering column.
825RS046
430RS004
Setting mark