1998 ISUZU TROOPER wheel

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)

SERVICE INFORMATION 00 – 19
Illustration Part No. Part Name
SPECIAL TOOLS
5–8840–0135–0
(J–29877–A)
5–8840–2297–0
(J–39213)
5–8522–0026–0
(J–26508)
5–8840–2121–0
(J–36831)
5–8840–0015–0
(J–22912–01)
5–8521–0016–0
(J–29752)Tester:
Power steering
Adapter:
Power steering tester
For 6VD1, 6VE1, 4JX1
5–8840–0136–0
(J–33996)Adapter:
Power steering tester
For 4JG2
Remover:
Pitman arm
Installer:
Extension housing oil sael
Remover:
Tie rod end
Remover:
Relay lever
Remover:
Steering wheel 5–8840–2005–0
(J–29107)

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

2A – 4 FRONT END ALIGNMENT
CASTER ADJUSTMENT
The caster angle can be adjusted by means of the caster
shims installed between the chassis frame and fulcrum
pins.
Caster Angle
1998 model
2° 10‘ ± 45‘
2000 model and later
RH 2° 22‘ ± 45‘
LH 2° 10‘ ± 45‘
CAUTION:
Left and right side to be equal within 30’
NOTE:
Difference of the caster shim front/rear thickness shall be
3.2 mm (0.126 in) or less. Overall thickness of caster shim
and camber shim shall be 10.8 mm (0.425 in) or less.
Tighten the fulcrum pin bolt to the specified torque.
Fulcrum Pin Bolt Torque N·m (kg·m/lb·ft)
152 (15.5 / 112)
CAMBER ADJUSTMENT
The camber angle can be adjusted by means of the
camber shims installed in position between the chassis
frame and fulcrum pins.
Wheel Alignment Specification
Camber Angle 0° ± 30‘
King pin inclination 12° 30‘ ± 30‘
CAUTION:
Left and right side to be equal within 30’
NOTE:
Overall thickness of caster shim and camber shim shall
be 10.8 mm (0.425 in) or less.
Tighten the fulcrum pin bolt to the specified torque.
Fulcrum Pin Bolt Torque N·m (kg·m/lb·ft)
152 (15.5 / 112)

FRONT END ALIGNMENT 2A – 5
Position of shim
Camber angle Caster angle
Front side Rear side
When added When removed Decreases Decreases
When removed When added Increases Increases
Caster shim
When removed Unchanged Decreases
When added Unchanged Increases
When added Decreases Unchanged
Camber shim
When removed Increases Unchanged
TOE-IN ADJUSTMENT
1. To adjust the toe-in angle, loosen the lock nuts on the
outer track rods and turn the outer track rods. Turn
both rods the same amount, to keep the steering
wheel centered.
Toe-in mm(in)
0 ± 2 (0 ± 0.08)
2. Tighten the lock nut to the specified torque.
Lock Nut Torque N·m (kg·m/lb·ft)
118 (12.0 / 87)
MAXIMUM STEERING ANGLE
ADJUSTMENT
The maximum steering angle of the front wheels can be
adjusted with the stopper bolts under the frame side
members.
1. Position each front wheel on the turning radius gauge
in a straight-ahead position.
2. Set the parking brake firmly.
3. Adjust the inside wheel angle of each side with the
stopper bolts.
NOTE:
The maximum protruding length (L) of stopper bolt from
the lock nut should be 10 mm (0.4 in) or less.

6. Tighten the lock nut to the specified torque.
Lock Nut Torque N·m (kg·m/lb·ft)
23 (2.3 / 17) 2A – 6 FRONT END ALIGNMENT
4. Similarly adjust the inside wheel angle of the other
side with stopper bolt.
Maximum Steering Angle
Inside wheel 34°+0°
-2°
Outside wheel 32°
NOTE:
Maximum steering angles should be set after adjusting
front wheel alignment.
5. If the stop between the lower link end and the knuckle
comes ahead of the stopper bolt, adjust the stopper
bolt so that inner stopper bolt touches the drop arm
(relay lever).

POWER STEERING 2A – 9
The hydraulic power steering system consists of a
pump, an oil reservoir, a steering gear, a pressure
hose and a return hose.
POWER STEERING GEAR
The power steering gear has a recirculating ball
system which acts as a rolling thread between the
worm shaft and the rack piston. When the worm
shaft is turned right, the rack piston moves up in
gear. Turning the worm shaft left moves the rack
piston down in gear. The rack piston teeth mesh
with the sector, which is part of the sector shaft.
Turning the worm shaft turns the sector shaft,
which turns the wheels through the steering
linkage.
The control valve in the steering gear directs the
power steering fluid to either side of the rack
piston. The rack piston converts the hydraulic
pressure into a mechanical force. If the steering
system becomes damaged and loses hydraulic
pressure, the vehicle can be controlled manually.
HYDRAULIC PUMP
The hydraulic pump is vane-type design.
There are two bore openings at the rear of the
pump housing. The smaller opening contains the
pressure line union and flow control valve.
PRESSURE SWITCH (6VD1,
6VE1 Engine)
When hydraulic pressure reaches 3650 ± 350 kPa
(530 ± 50 PSI), the pressure switch closes causing
ECM to actuate the idle air control valve to prevent
the overload-induced engine speed down. The
switch opens when hydraulic pressure drops to
3150 ± 350 kPa (460 ± 50PSI).