Chery A18. Manual — part 107

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3.

Inspection on abnormal abrasion of tire

Abnormal abrasion of tire shown in right figure might occur.

For possible reason and processing mode, please refer to

following sheet. Shown as figure.

Fig. Abrasion of tire

Possible reason

Processing mode

（a） * Tire pressure is lacking（both sides is abraded）

* High speed cornering

* Tire has not been adjusted complexly.

* Measure and adjust tire pressure

* Reduce speed

* Adjust tire

（b） * Tire pressure is too high (middle part is abraded）

* Tire has not been adjusted complexly.

* Measure and adjust tire pressure

* Adjust tire

（c） *Toein is incorrect

* Adjust toein

（d） * Camber angle or caster angle is incorrect

* Suspension system fault

* Tire is unbalanced

* Brake drum or brake disc is out of round

* Other mechanical problems

* Adjust tire

* Adjust, repair or replace parts of axle shaft

and suspension system.

* Repair or replace

* Perform tire balance or replace it.

* Calibrate or replace

* Calibrate or replace

* Adjust tire

4.

Precautions relating to rim and tire

(1)

Do not use unqualified rim or tire.

(2)

Aluminum alloy ring is easy to be scratched, please clean it with soft cloth while not steel brush. Do not

contact boiled water with the ring while cleaning vehicle with steam.

(3)

In case that Basal compound (such as earth water, mud on ground) attach on aluminum alloy ring, please

clean out them with neutral cleanser to avoid of damaging ring.

5.

Replacement of tire

(1)

Before assembly of tire valve, please check if air valve on wheel is sleek and has no burr, then wipe

glycerin on surface of rubber part of air valve or dip air valve in glycerin, and at last, assemble position

ring of air valve into hole of wheel with special tools and pressure of 200-400N (replacing glycerin with

soapy water is allowable).

(2)

Before assemble wheel, please wipe glycerin or soapy water around tire bead, and note: point uniformity

test mark on wheel to symmetry point mark if one symmetry point mark is existing. Point uniformity test

mark on wheel to air valve if no symmetry point existing. Please point air valve to static balance test mark

if neither symmetry point, or dynamic balance test mark existing on wheel, while a static balance test mark

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6.

Inspection on tire pressure

Inspect air pressure of all tires (include spare tire) with

barometer and adjust it if it is necessary. Charge tire

according to regulation strictly, and do not make air pressure

exceed 10% above rated pressure during charging. During

split charging, rated charging pressure of spare tire assembly

that is stored separately from the four assembled wheels is

3.0bar. Before conduct position fixing with the four wheels

please check air pressure of tire of them, and adjust air to:

front wheel 2.5bar, rear wheel 2.7bar. Shown as figure.

Inspection on tire pressure

7.

Inspection on leakage

Confirm if air valve is leaking, shown as figure.

8.

Inspection on plainness of rim

(1)

Jack up vehicle, and support it safely.

(2)

Fix dial gauge that has columnar contactor （Φ10）

on edge of circular rim, and measure depth of

plainness. Shown as figure

(3)

Replace rim if it is necessary.

Note: Distortion with circular rim is allowable:

Max allowable value of average value of plainness depth on

two edges of circular rim should not exceed:

Circular rim made of steel: 5mm

Circular rim made of aluminum alloy: 3mm

Inspection on plainness of rim

9.

Positional adjustment of tire

For extending service life of tire, as well as confirming

abrasion condition, it is necessary to adjust position of tire

every 6,000km, shown as figure.

Note:

*Use best tire as front tire.

*After positional adjustment, please adjust air pressure of

tires to regulated value.

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10. Balance adjustment of wheel

After charged, screw up protective cap of air valve and conduct balance test. Assemble balance weight of proper

weight on external edge of circular rim, it is required to adjust balance degree to value that is less than 100g.cm,

which is equivalent to 5g balance weight on internal and external edge of circular rim. Note: it is allowable only to

use one balance weight that is lighter than 70g on each side of wheel. During assembly, please prevent balance

weight from too stronger beat, and replace the balance weight if too stronger beat is felt. Do not use replaced

balance weight repeatedly.

11. Disassembly and assembly of wheel:

Disassembling steps:

(1)

Disassemble fixed bolt of wheel;

(2)

Take down the wheel.

Assembling step

(1) While assembling wheel and tire assembly, please

screw wheel bolt onto wheel hub and fasten it with

hand, then fasten it with special tools according mode

of diagonal line, with fastening moment of 110±10 Nm.

Do not use impact wrench to prevent wheel from

damage, or fastening too tightly or loosely. Do not

wipe grease on wheel bolt. (it is necessary to fasten

wheel bolt while drove for the first 100km after

installation of wheel and tire assembly to ensure

fastening moment, which is one content of daily

maintenance).

(2) Fasten fixed nuts to approximate degree in mode of decussating; after fastening, steering should rotate freely,

and locate at grounding.

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cover by flapping it with hands or striking it with rubber tools.

Section 2 Position fixing of front wheel

I.

Standard positional parameter of front wheel

Criterion: Requirement on position fixing of front wheel is shown as below:

II. Adjusting mode of toein of front wheel and caster angle

1.

Toein of front wheel

It is possible to conduct adjustment with toein by using optical tester and mechanical toein adjustor. Install wheel

locator or localized tester on wheel, and conduct assembly according to detailed illumination of equipment

manufacturer.

(1) Fix position of wheel according to requirement of tester: fix steering wheel to position of dead ahead with

steering wheeling stopper bought from market.(it is necessary to fix steering wheel in range of ±5° of center

position, and position upper clamping flange bolt of steering bearing horizontally)

(2) Loose locking nut and spring cover snap ring of right steering cross tie, screw toein regulator rod to adjust

length according to requirement until regulated value is achieved.

Caster angle of king pin

3

o

±20′

Camber angle of front

wheel

-30′±20′

Toein of front wheel