Chery A15. Manual - part 64

Adjusting the snow chain of the tire should accord to the type of the road condition. 
Inspection must be applied before install the snow chain. Please refer to the instruction of the 
snow chain manufacturer when install the snow chain on the tire. Please remove the wheel 
house before install the snow chain which may score the wheel house. Install the snow chain 
firmly on the front tire. It is not recommended to fix the snow chain on the rear wheel. The 
snow chain should be retightened after 0.5~1.0km driving with it. 

 

Precaution: Using the snow chain may affect the vehicle maneuverability, so the vehicle 
speed should not excess 50km/h (30mph) or the speed limited by the snow chain 
manufacturer(less than 50km/h). Please stop the car and tighten the snow chain 
immediately when hearing collision between the snow chain and the vehicle body or the 
chassis when using the snow chain. Abrupt turning, concussion and passing the 
chuckhole, the vehicle locking and braking should be avoided. The instruction of the 
snow chain manufacturer should be also complied. Improper utilization of the snow 
chain will cause interference between the snow chain and the vehicle body. 

 

Installation of the tire 

----Make sure that the opening of the valve is slippery and no burrs before installing the tire 

valve. Then apply glycerol onto the rubber surface of the tire valve or dip it briefly in the 
glycerol. Pull or press the locating ring of the tire valve with special purpose tool at the 
force of 200-400N in order to make it through the hole on the wheel, which means the 
installation is finished. (Suds are permitted to replace the glycerol.) 

----Wipe glycerol or suds round the bead before installing the tire, and please note at the 

same time: 

When there is a light point mark on the rim, please aim the uniformity test mark at the point. 

When there is no light point mark on the rim, please aim the dynamic balance test mark at 
the position of the tire valve. 

When there is no light point mark on the rim and no dynamic balance test mark but the static 
balance test mark on the tire, please aim the tire valve at the static balance test mark. 

The instructions for the uniformity, dynamic balance and static balance test mark of the tire 
should be offered by the production department or the supplier in written form. 

----Inflate the tires according to the specified pressure strictly. Please do not excess 10% of 

the rated pressure during inflating. The spare tire assy is assembled at the rated pressure 
of 3.5atm and is separately stored with the four tires installed on the vehicle. Please check 
and adjust the tire pressure before the four wheel alignment: front wheel 2.0±0.2atm, 
rear wheel 2.1±0.2atm. 

----Screw the valve cap after inflating the tire and undergo the dynamic balance test. Set the 

proper weight balance block onto the inside and outside brims of the rim as required. The 

M-4

final assy imbalance is expected to be less than 100g·cm, approximately equal to a 5g 
balance block on the inside and outside brims of the rim. 

Precaution: No more than one balance block with 70g weight at most is allowed to 
set on each side of a wheel. Avoid over hitting on the balance block. If that happened, 
replace it immediately. Do not reuse the replaced balance block. 

 

----During installing the wheel and the tire assy, pre-screw the wheel bolt on the rim by hand 

first, and then tighten the screws with the special purpose tools under the way of diagonal 
method, (the tightening torque is 100±10N·m). No impact wrench is allowed in order to 
avoid screwing too tight or loose. Do not use lubricating grease while installing the wheel 
bolt. (The wheel bolt should be tightened to maintain the tightening torque after the initial 
100km driving since the new installation of the wheel and tire assy. The check of the 
tightening torque of the wheel bolt is one of the daily service items.) 

----Decussating method is adopted to tighten the set nut. The tightening degrees should be 

similar so that the wheels can turn freely. The wheel should stand on the ground during 
the last tightening. 

----Install the trim cover or place it as required. Clip trim cover should be installed into 

through beating by hand or prying by rubber tools. 

 

USUAL TROUBLES OF THE TIRE 
Proper utilization of the tire 

The tire is an important part of the wheel assy. Please pay attention to the following items 
while using: 

------The tire of the same manufacturer and the same No. should be used on the same vehicle. 

------Do not install tires out of the specified types 

------Make all the tires wear evenly. In order to remedy and lighten the uneven wear, besides 

periodic checking and correcting the parameters of the wheel alignment, the rotation 
should be also applied. The specific rotation way depends on the practical wearing status. 
It is recommended to adopt the tire rotation at interval of 5000~8000km 

 

Usual troubles of tires and trouble diagnosis 

------Wear on shoulder of tire 

The wear on shoulder of tire means the brim with burrs forming of the tire wears are more 
badly than other parts. The theoretical reason for the wear on shoulder of tire is that the tire 
rolls at the limit lateral runout angle. 

Main reason: Frequently steering at high speed, improper adjusting the toe-in and the camber, 
or often driving on the vaulted or zigzag road. 

M-5

Maintenance: Adjusting the positioning angle of the front wheel 

------Wear on center of tire 

The wear on center of tire means the abnormal wear on the center surface of the tire. The 
theoretical reason for this kind of wear is that the diameter elongation at the center of the tire 
surface is larger than that on the shoulder of the tire. 

Main reason: Overhigh tire pressure 

Maintenance: Readjusting the tire pressure to make it within the range of the specified value.

 

------Serrated wear 

The serrated wear means the wear on the surface of the tire strip in ladder shape. The 
theoretical reason for this kind of wear is the uneven deformation of the tread pattern of the 
tire contact patch. 

Main reason: The toe-in and the camber are not conformed to the specified value 

Maintenance: Adjusting the toe-in and the camber to make it within the specified value. 
Checking the tire pressure is within the specified range. 

------Initial severe wear somewhere on the tire 

The initial severe wear is the severe wear on the tread pattern of tire contact patch due to the 
wheel locking while emergent braking. 

Main reason: Vehicle speed while emergent braking, road conditions, wheel load and the 
braking intensity 

Maintenance: Avoiding emergent braking and taking precautionary measure as early as 
possible 

------Nick and crack on the sidewall of tire 

The main reason is the sharp things on the road or the little stones, nails and metal flakes 
embedded into the tread slot. 

------Initial wear on half round of the tire or wear in different places of the shoulders on 
both sides 

The main reason is the gyration part is in unbalanced state, or the tire and wheel are eccentric, 
or the bearing is worn or loose and so on. The eccentricity or bend of the rim or the steering 
knuckle may also cause the wear. 

Troubleshooting Guide 

Trouble Possible 

causes 

Solutions 

Serious wear of tire 

Improper tire pressure 

Adjust 

Tire noise 

Improper tire pressure 

Adjust 

M-6

Degradation of tire 

Replace 

Road noise or 

vehicle vibration 

Insufficient tire pressure 

Unbalance of tire 

Deformation of rim or tire 

Uneven wear of tire 

Adjust 

Adjust 

Repair or 

Replace 

-- 

Up-and-down 

shaking of steering 

wheel 

Overbeating of tire and rim 

Looseness of wheel nut 

Unbalance of tire 

Breach or wear of engine bearing 

pad 

Breach or wear of transmission 

bracket rubber 

Replace 

Lock 

Adjust 

Replace 

Replace 

Circular vibration of 

steering wheel 

Overbeating of tire and rim 

Looseness of wheel bolt 

Unbalance of tire 

Uneven wear of tire 

Insufficient tire pressure 

Damage or wear of front wheel 

bearing 

Malfunction of steering system 

Malfunction of suspension system 

Replace 

Lock 

Adjust 

-- 

Adjust 

Replace 

-- 

-- 

One side deflection 

of steering wheel 

Improper tire pressure 

Serious or uneven wear of tire 

Malfunction of steering system 

Malfunction of braking system 

Malfunction of suspension system 

Adjust 

-- 

-- 

-- 

-- 

Unstable running 

Uneven tire pressure of both sides 

Deformation of rim or tire 

Looseness of wheel bolt 

Malfunction of steering system 

Adjust 

Repair or 

Replace 

Lock 

M-7