Engine JAC HFC4DA1-2C. Service manual — part 164
WT
WT
WT
WT Wheels
Wheels
Wheels
Wheels and
and
and
and Tires
Tires
Tires
Tires
- 183 -
Removal/installation
Removal/installation
Removal/installation
Removal/installation
Installation
1.
Install the flange onto the brake disc.
Caution:
Caution:
Caution:
Caution:
The adopted bearing races and rollers should be
from the same manufacturer.
2.
Reinstall the inner and outer races of bearing.
3.
Apply grease onto race and roller bearing.
4.
Reinstall it onto the bearing race.
5.
Clean the periphery of oil seal seat and apply
sealant onto it.
6.
Install oil seal and remove redundant sealant.
7.
Fill sealing shaft with grease and apply grease onto
lip surface.
FT
FT
FT
FT Four-Wheel
Four-Wheel
Four-Wheel
Four-Wheel Alignment
Alignment
Alignment
Alignment
- 183 -
Four-Wheel
Four-Wheel
Four-Wheel
Four-Wheel Alignment
Alignment
Alignment
Alignment
Applied models: SUNRAY products manufactured by JAC
Subject
Page
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Four-Wheel Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
Preparation before four-wheel alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . ... 184
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Four-Wheel Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
Function of each angle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Common fault symptom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Adjustment
Four/wheel alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 187
FT
FT
FT
FT Four-Wheel
Four-Wheel
Four-Wheel
Four-Wheel Alignment
Alignment
Alignment
Alignment
- 184 -
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Objectives
Objectives
Objectives
Objectives for
for
for
for four-wheel
four-wheel
four-wheel
four-wheel alignment:
alignment:
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
Principle
Principle and
and
and
and five
five
five
five factors
factors
factors
factors of
of
of
of four-wheel
four-wheel
four-wheel
four-wheel alignment
alignment
alignment
alignment
Principle:
Principle:
Principle:
Principle:
Rear wheels aligned first and then front wheels
Five
Five
Five
Five factors
factors
factors
factors:
1.
Camber
2.
Inclination angle
3.
Caster
4.
Toe-in
5.
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
Preparation before
before
before
before four-wheel
four-wheel
four-wheel
four-wheel alignment
alignment
alignment
alignment
1.
Check tire pressure and adjust it as required.
2.
Check body height.
�
Front part measurement
�
Rear part measurement
3.
Check wheel bearing clearance and replace front
wheel bearing when necessary.
4.
Check rim and tire condition.
5.
Check steering linkage and ball joint for looseness.
6.
Park the vehicle on flat ground with no luggage or
person inside.
7.
Check
wheels;
check
front
suspension
for
looseness.
8.
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
FT
FT
FT Four-Wheel
Four-Wheel
Four-Wheel
Four-Wheel Alignment
Alignment
Alignment
Alignment
- 185 -
Instruction
Instruction
Instruction
Instruction and
and
and
and Operation
Operation
Operation
Operation
Four-wheel
Four-wheel
Four-wheel
Four-wheel alignment
alignment
alignment
alignment parameters
parameters
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
Toe-in
Toe-in definition
definition
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.
2.
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:
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