Content .. 162 163 164 165 ..

Engine JAC HFC4DA1-2C. Manual - part 164

WT Wheels

Wheels

Wheels and

and

and Tires

Tires

- 183 -

Removal/installation

Installation
1.

Install the flange onto the brake disc.

Caution:

The adopted bearing races and rollers should be
from the same manufacturer.

Reinstall the inner and outer races of bearing.

Apply grease onto race and roller bearing.

Reinstall it onto the bearing race.

Clean the periphery of oil seal seat and apply
sealant onto it.

Install oil seal and remove redundant sealant.

Fill sealing shaft with grease and apply grease onto
lip surface.

FT Four-Wheel

Four-Wheel

Four-Wheel Alignment

Alignment

- 183 -

Four-Wheel

Four-Wheel Alignment

Alignment

Applied models: SUNRAY products manufactured by JAC

Subject

Page

Instruction

Instruction and

and

and Operation

Operation

Four-Wheel Alignment.................................................................................................................................................184

Preparation before four-wheel alignment............................................................................................................... 184

Diagnosis

Diagnosis and

and

and Testing

Testing

Four-Wheel Alignment.................................................................................................................................................185

Function of each angle............................................................................................................................................185
Common fault symptom......................................................................................................................................... 186

Adjustment

Four/wheel alignment.................................................................................................................................................. 187

FT Four-Wheel

Four-Wheel

Four-Wheel Alignment

Alignment

- 184 -

Instruction

Instruction and

and

and Operation

Operation

Objectives

Objectives for

for

for four-wheel

four-wheel

four-wheel alignment:

alignment:

�

Elimination of deflection

�

Decrease of chassis wear

�

Straightness of linear steering wheel

�

Decrease of tire wear

�

Straightness of steering wheel after turning

�

Decrease of tire wear

�

Straightness of linear steering wheel

�

Recovery of new car driving feeling

Principle

Principle and

and

and five

five

five factors

factors

factors of

of four-wheel

four-wheel

four-wheel alignment

alignment

Principle:

Rear wheels aligned first and then front wheels
Five

Five

Five factors

factors

factors:

Camber

Inclination angle

Caster

Toe-in

Adjustment of thrust axis and angle

Function of four-wheel alignment
Four-wheel alignment functions for measurement of
alignment angle of chassis. In case of a little change in
chassis parameters, it is only needed to adjust the
alignment angle; in case of large difference, the

deformed or damaged parts should be detected for
complete removal of fault.
Note: It is a must to check the chassis condition before
conducting four-wheel alignment.
Preparation

Preparation

Preparation before

before

before four-wheel

four-wheel

four-wheel alignment

alignment

Check tire pressure and adjust it as required.

Check body height.

�

Front part measurement

�

Rear part measurement

Check wheel bearing clearance and replace front
wheel bearing when necessary.

Check rim and tire condition.

Check steering linkage and ball joint for looseness.

Park the vehicle on flat ground with no luggage or
person inside.

Check

wheels;

check

front

suspension

for

looseness.

Check shock absorber for normal operation.

Note:
Make sure half level in oil tank, as well as the required
level of cooling water in water tank and proper engine
oil. The tire jack and accessories should be placed at the
specified position.

FT Four-Wheel

Four-Wheel

Four-Wheel Alignment

Alignment

- 185 -

Instruction

Instruction and

and

and Operation

Operation

Four-wheel

Four-wheel alignment

alignment

alignment parameters

parameters

Front wheel camber

0.75±1°

1.25°

Kingpin caster

1.5±1.5°

1°

Kingpin inclination angle

12.75°±1°

1.25°

Toe-in

0～2mm

This vehicle is light-duty bus, with integral rear axle.
Rear wheel parameters cannot be adjusted during
four-wheel alignment.
1.

Front wheel camber：
Camber refers to the angle included between
geometry centerline and plumb line of tire viewed
from the front of vehicle. Tire upper edge deviates
to the inside (approaching to engine) or outside
(deviated from engine):

�

Zero camber refers to the state that the tire
centerline is coincided with the plumb line.

�

Positive camber refers to the state that the tire
centerline is located outside of plumb line.

�

Negative camber refers to the state that the tire
centerline is located inside of plumb line.

�

Excessive camber may lead to outside wear of
tire and too small camber may lead to inside
wear of tire. In case of inconsistency between
two wheel cambers, the vehicle shall be pulled
to one side of the larger camber.

Toe-in

Toe-in definition

definition

Front wheel toe-in is observed from the front of
vehicle and measured when two wheel axles are of
the same height. Front and rear end distance
difference between left and right tire centerline is
known as the total toe-in, as shown in the figure:
Zero toe-in: Left and right tire centerline distance
at front and rear end is equal: A=B.
Positive toe-in: Left and right tire centerline
distance at front end is less than that at rear end:
A<B.
Negative toe-in: Left and right tire centerline
distance at front end is larger than that at rear end:
A>B.

Toe-in function
It is used for elimination of tire skidding caused by
camber. The effect of wheel camber shall make the
wheel top face tilted outwards and the wheel shall
roll outwards during running, thus skidding is
formed, which shall lead to tire wear. The toe-in
functions to eliminate tire skidding due to camber,
as shown in the figure:

Front

Wheel toe-in:
Wheel toe-out:

Content .. 162 163 164 165 ..