isuzu FRONT SUSPENSION.pdf

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FRONT SUSPENSION
TROOPER
SUSPENSION
CONTENTS
Front Suspension
. . . . . . . . . . . . . . . . . . . . . . .
3C
Rear Suspension
. . . . . . . . . . . . . . . . . . . . . . . .
Wheel and Tire System
3D
. . . . . . . . . . . . . . . . . .
3E
FRONT SUSPENSION
CONTENTS
Service Precaution
. . . . . . . . . . . . . . . . . . . . . .
3C–1
Upper Control Arm
. . . . . . . . . . . . . . . . . . . . . .
Upper Control Arm and Associated Parts
3C–14
General Description
. . . . . . . . . . . . . . . . . . . . .
3C–2
.
3C–14
General Diagnosis
. . . . . . . . . . . . . . . . . . . . . . .
3C–3
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–14
. . . . . . . . . . . . . . . . . .
3C–15
Shock Absorber
. . . . . . . . . . . . . . . . . . . . . . . . .
Shock Absorber and Associated Parts
3C–6
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lower Control Arm
Installation
3C–16
. . . .
3C–6
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–6
. . . . . . . . . . . . . . . . . . . . . .
Lower Control Arm and Associated Parts
3C–18
. . . . . . . . . . . . . . . . . .
3C–6
.
3C–18
Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3C–6
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–18
. . . . . . . . . . . . . . . . . .
3C–20
Stabilizer Bar
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Stabilizer Bar and Associated Parts
3C–7
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Upper Ball Joint
Installation
3C–20
. . . . . .
3C–7
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–7
. . . . . . . . . . . . . . . . . . . . . . . . .
Upper Ball Joint and Associated Parts
3C–22
. . . . . . . . . . . . . . . . . .
3C–7
. . . .
3C–22
Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3C–7
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–22
. . . . . . . . . . . . . . . . . .
3C–23
Torsion Bar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Torsion Bar and Associated Parts
3C–8
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lower Ball Joint
Installation
3C–23
. . . . . . . .
3C–8
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–8
. . . . . . . . . . . . . . . . . . . . . . . . .
Lower Ball Joint and Associated Parts
3C–24
. . . . . . . . . . . . . . . . . .
3C–9
. . . .
3C–24
Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3C–9
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–24
. . . . . . . . . . . . . . . . . .
3C–25
Knuckle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Knuckle and Associated Parts
3C–11
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications
Installation
3C–25
. . . . . . . . . . .
3C–11
. . . . . . . . . . . . .
3C–26
Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
3C–11
Special Tools
. . . . . . . . . . . . . . . . . . . . . . . . . . .
3C–27
. . . . . . . . . . . . . . . . . .
3C–12
Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3C–12
Service Precaution
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNING COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
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FRONT SUSPENSION
General Description
C03RW001
Legend
(1)
(4)
Torsion Bar
Shock Absorber
(5)
Link
(2)
Upper Control Arm
(6)
Lower Control Arm
(3)
Height Control Arm
(7)
Stabilizer Bar
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.
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.
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
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FRONT SUSPENSION
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 bar are connected to the lower control
arms by links.
General Diagnosis
Condition
Possible cause
Correction
Vehicle Pulls
Mismatched or uneven tires.
Replace tire.
Tires not adequately inflated.
Adjust tire pressure.
Broken or sagging springs.
Replace spring.
Radial tire lateral force.
Replace tire.
Improper wheel alignment.
Adjust wheel alignment.
Brake dragging in one wheel.
Repair brake.
Loose, bent or broken front or rear
suspension parts.
Tighten or replace the appropriate
suspension part(s).
Faulty shock absorbers.
Replace shock absorber.
Abnormal or Excessive Tire Wear
Sagging or broken spring.
Replace spring.
Tire out of balance.
Balance or replace tire.
Improper wheel alignment.
Check front end alignment.
Faulty shock absorber.
Replace shock absorber.
Hard driving.
Replace tire.
Overloaded vehicle.
Replace tire and reduce load.
Tires not rotated periodically.
Replace or rotate tire.
Worn or loose road wheel bearings.
Replace wheel bearing.
Wobbly wheel or tires.
Replace wheel or tire.
Tires not adequately inflated.
Adjust the pressure.
Wheel Hop
Blister or bump on tire.
Replace tire.
Improper shock absorber operation.
Replace shock absorber.
Shimmy, Shake or Vibration
Tire or wheel out of balance.
Balance wheels or replace tire/or
wheel.
Loose wheel bearings.
Replace wheel bearing.
Worn steering linkage ball joints.
Replace ball joints.
Worn upper or lower ball joints.
Replace ball joints.
Excessive wheel runout.
Repair or replace wheel and/or tire.
Blister or bump on tire.
Replace tire.
Excessive loaded radial runout of
tire/wheel assembly.
Replace tire or wheel.
Improper wheel alignment.
Check wheel alignment.
Loose or worn steering linkage.
Tighten or replace steering linkage.
Loose steering gear.
Tighten housing bolts.
Tires not adequately inflated.
Adjust tire pressure.
Loose, bent or broken front or rear
suspension parts.
Tighten or replace the appropriate
suspension parts.
Faulty shock absorber.
Replace shock absorber.
Hub bearing preload misadjustment.
Adjust preload.
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FRONT SUSPENSION
Condition
Possible cause
Correction
Hard Steering
Bind in steering linkage ball studs,
upper or lower ball joint.
Replace ball joint.
Improper wheel alignment.
Check wheel alignment.
Steering gear misadjustment.
Check and adjust pinion torque.
Tire not adequately inflated.
Inflate tires to proper pressure.
Bind in steering column or shaft.
Repair or replace.
Improper power steering system
operation.
Repair or replace. Refer to Steering
section.
Too Much Play In Steering
Wheel bearings worn.
Replace wheel bearings.
Loose steering gear or linkage.
Retighten or repair.
Steering gear misadjustment.
Inspect and adjust steering gear
preload.
Worn or loose steering shaft
universal joint.
Retighten or replace steering shaft.
Worn steering linkage ball joints.
Replace ball joints.
Worn upper or lower ball joints.
Replace ball joints.
Poor Steering Wheel Returnability
Bind in steering linkage ball joints.
Replace ball joints.
Bind in upper or lower ball joints.
Replace ball joints.
Bind in steering column and shaft.
Repair or replace.
Bind in steering gear.
Check and repair steering gear.
Improper wheel alignment.
Adjust wheel alignment.
Tires not adequately inflated.
Adjust tire pressure.
Loose steering wheel nut.
Retighten.
Worn wheel bearing.
Replace.
Abnormal Noise
Worn, sticky or loose upper or lower
ball joint, steering linkage ball joints
or drive axle joints.
Replace.
Faulty shock absorbers.
Replace.
Worn upper or lower control arm
bushing.
Replace.
Loose stabilizer bar.
Retighten bolts or replace bushings.
Loose wheel nuts.
Tighten nuts. Check for elongated
wheel nut holes. Replace wheel if
required.
Loose suspension bolts or nuts.
Retighten suspension bolts or nuts.
Broken or otherwise damaged wheel
bearings.
Replace wheel bearing.
Broken suspension springs.
Replace spring.
Loose steering gear.
Retighten mounting bolt.
Faulty steering gear.
Check and adjust steering gear.
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FRONT SUSPENSION
Condition
Possible cause
Correction
Wandering or Poor Steering Stability
Mismatched or unevenly worn tires.
Replace tire or inflate tires to proper
pressure.
Loose steering linkage ball joints.
Replace ball joints.
Faulty shock absorbers.
Replace shock absorber.
Loose stabilizer bar.
Tighten or replace stabilizer bar or
bushings.
Broken or sagging springs.
Replace spring (pairs).
Steering gear misadjustment.
Check or adjust steering gear.
Improper wheel alignment.
Adjust wheel alignment.
Erratic Steering When Braking
Worn wheel bearings.
Replace wheel bearings.
Broken or sagging springs.
Replace spring (pairs).
Leaking caliper.
Repair or replace caliper.
Warped discs.
Replace brake disc.
Badly worn brake pads.
Replace brake pads.
Tires are inflated unequally.
Inflate tires to proper pressure.
Low or Uneven Trim Height
Broken or sagging springs.
Replace springs (In pairs).
Vehicle overloaded.
Reduce load.
Incorrect springs.
Adjust or replace torsion bar.
Suspension Bottoms
Vehicle overloaded.
Reduce load.
Faulty shock absorber.
Replace shock absorber.
Incorrect, broken or sagging springs.
Replace springs.
Body Leans
Loose stabilizer bar.
Tighten stabilizer bar bolts or replace
bushings.
Faulty shock absorber, struts or
mounting.
Replace shock absorber.
Broken or sagging springs.
Replace springs (In pairs).
Vehicle overloaded.
Reduce load.
Cupped Tires
Worn wheel bearings.
Replace wheel bearing.
Excessive tire or wheel run out.
Replace tire or wheel.
Worn ball joints.
Replace ball joints.
Tire out of balance.
Adjust tire balance.
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