JAC S2 (Chassis). Service Manual — part 5

Front suspension

Front suspension

54

Front shock absorbers and coil springs support assembly structure

1. Front shock absorber assembly
2. The front coil spring
3. The decorative cover
4. The buffer block
5. Dust cover
6. Upper spring cushion
7. Upper installation buffer block
8. Damper bearing
9. Upper spring seat
10. Self-locking nuts
11. (Fixed bearing) Nuts

Front suspension

Front suspension

55

Sub-frame assembly structure

1. Sub-frame assembly
2. Hex flange locking bolt pad assembly
3. Hex flange locking bolt pad assembly
4. Hex flange locking bolt pad assembly

Front suspension

Front suspension

56

Front hub assembly structure

1. Knuckle
2. Fender
3. Clamp
4. Flange plate
5. Bearing

6. (Fixed fender) bolt

Front suspension

Front suspension

57

(II) Technical parameters

Item

parameters and specifications

Front suspension mode

McPherson independent front suspension form with coil
spring suspension

Shock
absorber

model

Bidirectional hydraulic cylinder

stroke

140mm

Damping force

pill

806N±125N （0.3m/s）

press

443N±91N （0.3m/s）

Coil spring

free height：326mm

(reference）

Color rematk: yellow
and white stripe

Wheel

alignm
ent (no
load)

Wheel toe

3.75′±6.75′

Wheel camber

24′±30′

Kingpin inclination

10.5°±1°

Kingpin caster

3.65°±0.75°

Kingpin offset

-3.8mm

(III) Torque parameters

No

Item

Torque（N·m）

R
e
m
a
r
k

1 front stabilizer bar mounting bracket and the sub-frame fixing bolts

60~72

2 front shock absorber and body assembly nut

60~72

3 front shock absorber self-locking nut

50~70

4 front shock absorber and steering knuckle connecting bolt

100~1
20

5 stabilizer link assembly and stabilizer bar / damper assembly

connecting nut

60~72

6 lower arm ball pin and lower arm connecting nut

60~70

7 lower arm front liner and sub frame connecting bolt

130~1
50

8 lower arm rear liner and sub frame connecting bolt

130~1
50

9 Engine rear suspension and front sub frame connecting bolt

130~1
50

10 front sub frame front mounting nut

110~1
30

11 front sub frame rear mounting nut

60~72

12 drive shaft and front wheel hub assembly self-locking nut

240~2
60

(IV) Maintenance precaution

1. When install suspension or rubber liner, final tightening must be carried out under the condition that
the tire is on ground and with no-load.
2. After finish suspension components maintenance, be sure to check wheel alignment.
3. The oil will shorten the life of the rubber liner. Be sure to clean the spilled oil.
4. The no-load condition is the condition that fuel, engine coolant and lubricant are normally raised,
and spare tire, jack, hand tools and mats are in designated positions.

Front suspension

Front suspension

58

5. The locking nut should not be reused. Always use a new nut during installation. When replacing,
before tighten the locking nut, do not wipe anti-rust oil on the locking nut.

(V) Special tools

No.

Tool

Outlook

Description

1

Japanese-style ball
puller

Remove ball head

2

Damping

spring

puller

Remove, install damper spring

3

Hub

Installation

Tool

Install front and rear wheel hub

II. Fault diagnosis

(I) Fault diagnosis table

No.

Failure
Cause

Failure Analysis

Solution

Remark

1 Heavy steering

wheel alignment improper

Adjust

rotation beyond lower arm ball head
replacement

replace

tire pressure too low

charge air

With no power to steer

Maintain or replace

2

Improper
return

Front wheel alignment improper

Adjust

Shock absorber fault

Maintain or replace

anti-roll bar worn or damaged

replace

coil spring worn or damaged

replace

Lower arm liner worn

replace

3 Tire worn

abnormal

Front wheel alignment improper

Adjust

Tire pressure too low or too high

Adjust pressure

Shock absorber fault

Maintain or replace

4

Vehicle
deviation

front wheel alignment improper

adjust or replace

Lower arm ball head connector turn
without enough resistance

replace

Lower arm liner worn or loosen

replace

No.

Failure
Cause

Failure Analysis

Solution

Remark

5

vehicle
unilateral
deviation

improper front wheel alignment

adjust or replace

Lower arm ball head connector turn
without enough resistance

Replace

Lower arm bent

Replace

coil spring worn or damaged

Replace

Front suspension

Front suspension

59

6

Steering
wheel shimmy

improper front wheel alignment

adjust or replace

Lower arm ball head connector turn
without enough resistance

Replace

Lower arm liner loose or worn

Replace

shock absorber fault

maintain or replace

Anti-roll bar worn or damaged

Replace

coil spring worn or damaged

replace

7

vehicle
sagging

coil spring worn or damaged

replace

shock absorber fault

maintain or replace

III. Lower arm assembly

(I) Remove

△ Note to maintain wheel balance, before removing the

tire, mark the relative positions of the wheel.

1. Remove the wheels refers to the wheels
2. Remove the lower arm assembly

1) Remove the cotter pin and slotted nut connecting the
lower arm and knuckle.

2). Remove the front connection bolt between the lower
arm assembly and front sub frame.

3). Disengage the lower ball pin and the joint connection
with a special tool.

△ Note to avoid violent demolition.

Front suspension

Front suspension

60

4) Remove front connection bolt between the lower arm
assembly and front sub frame.

(II) Installation

1. Install the lower arm assembly

1) Place the lower arm assembly to the mounting position.

2) Install front connection bolt between the lower arm
assembly and front sub frame.
Tightening Torque 130 ~ 150N • m

3) Install rear connection bolt between the lower arm
assembly and front sub frame.
Tightening Torque 130 ~ 150N • m

Front suspension

Front suspension

61

4). Install the cotter pin and slotted nut connecting the
lower arm and knuckle

Tightening torque 60 ~ 72N • m

2. Install the wheel

IV. Front shock absorber and coil spring support assembly

(I) Remove

△ Note To maintain wheel balance, before removing the

tire, mark the relative positions of the wheel.

1. Open the engine hatch
2. Remove the wheels refers to the wheels
3. Remove the front shock absorber and coil spring support assembly

1). Remove the fixing bolt connecting the front shock
absorber in the central of the front brake hose, disengage
the connection between the front brake hose and the front
shock absorber.

2). Disengage a fixing point connecting the front wheel
speed sensor harness and front shock absorber.

Front suspension

Front suspension

62

3). Remove a fixing nut connecting the front shock
absorber assembly and the left damper ball lever;
disengage the front shock absorber assembly and the left
damper ball lever.

4) Remove a self-locking nut connecting front shock
absorber and coil springs support assembly nut and the
body.

5) Remove two bolts and nuts connecting the front shock
absorber assembly and the front knuckle.

Front suspension

Front suspension

63

6) Remove the front shock absorber and coil spring
support assembly from the wheel cover side.

(II) Installation

1. Install the front shock absorber and coil springs support assembly

1) Place the front shock absorber and the coil spring
support assembly to the mounting position.

2) Install two bolts and nuts connecting the front shock
absorber assembly and the front knuckle.
Tightening Torque 100 ~ 120N • m

3) Inset all a self-locking nut connecting front shock
absorber and coil springs support assembly nut and the
body.
Tightening torque 60 ~ 72N • m

Front suspension

Front suspension

64

4) Install a fixing nut connecting the front shock absorber assembly and the left ball pin lever.

Tightening torque 55 ~ 65N • m

5) Connect a fixing-point connection between the front
wheel speed sensor harness and front shock absorber.

6) Install the fixing bolt connecting the central of the front
brake hose and the front shock absorber.
Tightening torque 55 ~ 65N • m

2. Install the wheel
3. Close the engine hatch

V. Stabilizer bar

(I) Remove

△ Note To maintain wheel balance, before removing the

tire, mark the relative positions of the wheel.

1. Remove the left front wheel refers to the wheel
2. Remove the right front wheel refers to the wheel
3. Remove the stabilizer bar on the front sub frame and steering gear assembly refers to the front sub
frame assembly
4. Remove the stabilizer bar

1). Disassemble the four hex flanges bolt pad connecting
stabilizer bar and front sub frame.

2) Remove the stabilizer bar fixing bracket.

3) Remove the stabilizer bar liner.

4) Remove the stabilizer bar.

Front suspension

Front suspension

65

(II) Installation

1. Install the stabilizer bar

1) Place the stabilizer bar to the front sub frame mounting
position.

2) Place the stabilizer bar liner, stabilizer bar mounting
bracket; tighten the four hex flanges bolt pad connecting
stabilizer bar and front sub frame.
Tightening torque 60 ~ 72N • m

2. Install the stabilizer bar of the front sub frame and steering gear assembly
3. Install the left front wheel
4. Install the right front wheel

VI. Left ball pin rod assembly

(I) Remove

1. Lift vehicle
2. Remove the left ball pin rod assembly

1). Remove a self-locking nut connecting the left ball pin
rod assembly and stabilizer bar; disengage the left ball pin
rod assembly and stabilizer bar connection.

Front suspension

Front suspension

66

2). Remove a self-locking nut connecting the left ball pin
rod assembly and the front shock absorber assembly;
disengage the left ball pin rod assembly and the front
shock absorber connection.

3) Remove the left ball pin rod assembly

(II) Installation

1. Install the left ball pin rod assembly

1) Install a self-locking nut connecting the left ball pin rod
assembly and front shock absorber assembly.
Tightening torque 55 ~ 65N • m

△ Note self-locking nut cannot be reused, it must be

replaced with new ones.

2) Install a self-locking nut connecting the left ball pin rod

Front suspension

Front suspension

67

assembly and stabilizer bar.
Tightening torque 55 ~ 65N • m

△ Note self-locking nuts cannot be reused, it must be

replaced with new ones.

2. Lower the vehicle

VII. Front sub frame assembly

(I) Remove

1. Remove the left front wheel refers to the wheel
2. Remove the right front wheel refers to the wheel
3. Remove the left lower arm assembly refers to the lower arm assembly
4. Remove the right lower arm assembly refers to the lower arm assembly
5. Remove the rear suspension assembly refers to the rear suspension assembly
6. Remove the stabilizer bar of the front sub frame and diverter assembly

1). Remove a mounting bolt connecting the steering shaft
with a universal joint assembly and diverter.

2) Remove a self-locking nut connecting the left ball pin
rod assembly and stabilizer bar.

Front suspension

Front suspension

68

3) Remove a cotter pin and slotted nut connecting the
knuckle and tie rod.

4). Remove the two fixing bolts connecting the front sub
frame and the body front point.

5) Remove the two fixing bolts connecting the front sub
frame and the body middle point.

6) Remove the two fixing bolts connecting the front sub
frame and the body rear point.

7) Remove the front sub frame with stabilizer bar and
diverter assembly.

7. Remove the front sub frame

1). Remove the two hex flange bolts connecting diverter
assembly and the front sub frame and two locking nuts on
the diverter.

2) Remove the diverter assembly.

Front suspension

Front suspension

69

3). Disassemble four hex flange bolts pad connecting
stabilizer bar and front sub frame.

4) Remove the stabilizer bar fixing bracket.

5) Remove the stabilizer bar liner.

6) Remove the stabilizer bar.

(II) Installation

1. Install the front sub frame

1) Place the stabilizer bar to the mounting position of the
front sub frame.

2) Place the stabilizer bar liners, stabilizer bar mounting
bracket; tighten the four hex flange bolts pad connecting
the stabilizer bar and front sub frame.
Tightening torque 60 ~ 72N • m

3) Place the diverter assembly to the front sub frame
mounting position.

4) Install the two hex flange bolts connecting diverter
assembly and the front sub frame and two locking nuts of
diverter.
Tightening torque 95 ~ 105N • m