wheel alignment ISUZU TF SERIES 2004 Owner's Manual

3C-54 FRONT SUSPENSION
TROUBLESHOOTING
1. VIBRATION, SHOCK, AND SHIMMY OF STEERING WHEEL

Checkpoint Trouble Cause Countermeasure



Check front axle


Check wheel alignment


Check suspension ball joint


Check shock absorber or
attaching nut and bolt


Replace


Adjust


Replace


Replace or retighten


Check steering unit and
linkage


Faulty


Worn


Malfunction or loose


Check upper and lower link
bushings
Replace


Adjust


Worn


Incorrect

OK OK OK
NG NG NG NG NG NG
OK OK
Check vehicle trim height





Improperly adjusted or worn front
wheel bearing.


Worn or incorrectl
y adjusted wheel
bearing.
Replace; refer to Section 4C "Front
Wheel Drive"


Insufficientl
y tightened steeringgear housing.


Wear of steering linkage.


Excessive backlash due to
improper ad
justment of the steeringgear box.

Worn column bearing weakened
column bearing spring, or loose
clamp.
Replace; refer to Section 3B
"Steering"


Improper tire pressure.

Imbalance and deformation of frond
wheel.


Unevenl
y worn tire or insufficient
tightening of wheel nuts.
Replace; refer to Section 3E "Wheel
and Tires"

FRONT SUSPENSION 3C-55
2. VEHICLE PULLS TO RIGHT OR LEFT

Checkpoint Trouble Cause Countermeasure



Steering linkage, and upper
and lower link


Rubber bushing for upper and
lower link


Wheel alignment


Vehicle trim height


Replace


Replace


Adjust


Adjust


Deformed


Worn


Incorrect


Incorrect


Brake adjustment (binding)

Adjust


Replace


Incorrect

Collapsed or break (4

2
Except high ride suspension)
Collapsed or twisted (4

4, 4

2
High ride suspension)
Continued on the next pageOK OK OK OK
NG NG NG NG NG NG
OK OK Coil spring (4
2 Except high
ride suspension)
Torsion bar (4

4, 4

2 High
ride suspension)

Front wheel bearing

Adjust or replace

Incorrect adjustment or
abrasion
NG

FRONT SUSPENSION 3C-57
3. INSTABILITY OF VEHICLE

Checkpoint Trouble Cause Countermeasure



Tire pressure


Wheel alignment

Rubber bushings for upper
and lower links. (4
2 Except
high ride suspension)


Adjust


Adjust


Replace


Incorrect



Incorrect


Worn


Steering linkage and upper
and lower links

Replace


Adjust


Worn or deformed


Incorrect

OK OK OK
NG NG NG NG NG
OK OK
Vehicle trim height


Road wheel

Adjust

Deformed or unbalanced
NG

3C-58 FRONT SUSPENSION
4. STIFF STEERING WHEEL

Checkpoint Trouble Cause Countermeasure



Steering gear box or steering
linkage


Steering linkage


Steering gear


Wheel alignment


Replace the part


Replace


Replace


Adjust

Insufficient lubricants or
impurities present; or
excessively worn

Deformed


Worn or damaged


Incorrect


Replace

Stiff or damaged or lack of
grease

OK OK OK OK OK
NG NG NG NG NG
OK
Upper and ball joint


Steering column with turn
signal switch

Replace

Interference abrasion
NG

Tire pressure

Adjust

Improper
NG

3C-62 FRONT SUSPENSION
7. GRATING TIRE NOISE

Checkpoint Trouble Cause Countermeasure

Tire pressure
Knuckle spindle and steering
linkage
Adjust
Replace
Improper
Deformed
Suspension fixing boltReplace
Adjust
Loose
Incorrect
OK
NG NG NG NG
OK OKWheel alignment

FRONT SUSPENSION 3C-63
8. EXCESSIVELY OR PARTIALLY WORN TIRE

Checkpoint Trouble Cause Countermeasure

Brake adjustment
Wheel alignment
Adjust
Adjust
Incorrect
Incorrect
Front wheel bearingReplace
Adjust
Faulty
Improper
OK
NG NG NG NG
OK OKTire pressure
Tire rotationRotate tires at recomended
intervalsNot rotated OK
NG

3E-10 WHEELS AND TIRES

TROUBLESHOOTING
Typical examples of abnormal tire tread wear and major causes :

CAUTION:
Similar wear patterns can be caused by worn suspension parts, misalignment of wheels and tires, and
other suspension related problems.


Spotty wear - wear localized
on shoulder section. In
extreme cases, the tire
becomes polygonal in shape.
Tire or wheel out of
round or distorted.Hub or knuckle out
of round or distorted.Play in hub bearings
or ball joints.Rotating parts out of
balance.
Tread wear one-sided.
Rotating parts out of
balance.Tire or wheel out of
round.Hub or knuckle out
of round or distorted.
Localized tread wear.
Once spotty wear develops in
tread due to hard braking or
abrupt starting, localized wear
tends to be accelerated.