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Chery A15. Manual - part 76

piston; Weakening of the pressure regulator spring, damage on the seal components. Find
out the malfunctions and eliminate them. If necessary, replace the oil pump.

Steering wheel floating or deflecting when the Vehicle runs straight

※Malfunction symptom

It is difficult to keep the vehicle running straight.

※Malfunction reason

The steering control valve torque rod is damaged or too gentle to overcome the transmission

resistance of the steering gear, which does not enable the valve bush return in time.

The movement of the valve bush and valve core is clogged due to the unclean oil.

The steering core of the steering control valve is deviated from the center position.

The relief piston of the steering pump pressure regulator is clamped which makes the flux of

the pump and the pressure difference between the left and right power cylinders too large.

Clearance of the steering transmission mechanism connectors are too large, the connectors
are loose or overworn.

※Diagnosis and Troubleshooting

First, check if the connectors of the steering transmission mechanism are loose, the

clearances of the components are too large, the transmission is slack, in order to eliminate
the trouble in the steering transmission mechanism.

Check if the oil is polluted. If the vehicle is new or repaired or the maintenance and
oil-change regulars are not carried out, the oil may be polluted. The polluted oil should be
replaced.

Check the steering control valve. Turn the steering wheel without starting the engine to
judge that whether the control valve can open and close smoothly. If there is abnormal,
disassemble and check it.

Finally, check if the pressure regulator of the steering pump works normally and the relief
piston is clogged. If necessary, measure the output pressure of the steering pump and then
judge it.

Steering noise

※Malfunction symptoms

There is abnormal noise when the vehicle turns.

※Malfunction reason

The noise in the steering system when the vehicle turns is normal; the noise in the early

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2~3min, which appears in the steering pump is normal when the engine is started in cold
weather (20

or even colder)

℃

. But when the noise is abnormal and the turning performance

is affected, the noise can be considered as malfunction. The reasons are shown below：

The looseness of the steering transmission mechanism causes the abnormal turning noise.

The power steering pump is damaged or overworn or air is mixed into the liquid which
causes the loud noise.

The power steering pump driving belt pulley is loose or the belt sliding which causes the
loud noise.

The performance of the steering control valve is poor.

The oil tube connector is loose or the oil tube is broken.

The oil-filter strainer is blocked or there are too much sediments in the hydraulic circuit.

※Diagnosis and Troubleshooting

If there is sound of “click” when the vehicle turns, maybe the steering column connector, tie

rod or ball joint loose. These components should be checked. If necessary, tighten them or
replace the damaged one; if the vibration of the steering column shaft is obvious, replace
the steering column assy; if the steering gear is installed too loose, tighten it; lubricate the
connecting sections where are necessary. In addition, if the steering pump driving belt is
loose it will also make a sound of “click”. Therefore, the steering pump belt wheel should
be checked if it is loose. If necessary, screw tightly or replace it to clear up the noise
failure.

If there is sound of “quack-quack” when the vehicle turns, especially when the steering
wheel is turned from one limit position to another which may be caused by the sliding of
the power steering pump. Check the tension and the wear status of the driving belt, then
tighten or replace it depending on practical situation.

If there is sound of “cluck” from the steering pump when the vehicle turns, the reason
maybe the air bubbles in the oil which cause the pneumatic noise as the oil flows. First,
check the oil level. If it is too low, fill the oil reservoir with oil to the proper position to
check and eliminate the leakage failure. Then, check if the hose is broken, or the clamp is
loose which the air would enter the system. Replace the broken hose or the clamp, if
necessary. After confirming that the air entered the liquid of the power steering system,
discharge the air from the power steering system to eliminate the pneumatic noise. If there
is sound of “hiss” or scream from the steering pump, and there is no air leakage in the
hydraulic system, the tension of the driving belt is normal, it shows there is block in the oil
pipeline or the oil pump is overworn and damaged. Repair or replace it.

There is sound of “hiss” when the steering wheel is in limit position or turning slow in spot.
If the noise is extremely abnormal, the performance of the steering control valve may be
incompetent. The control valve should be replaced and compared to eliminate the failure.

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PRECAUTION OF STEERING SYSTEM MAINTENANCE

Caution: The steering gear is an important danger-proof component which can affect

the driving security. If failure appears during use, the vehicle should be sent to
the service station designated by Chery; the company is not responsible for the
accidents due to self-disassembling, self-maintenance and improper operation.

The peak rate of flow in the system could not exceed 10L/min, maximal working oil
pressure could not exceed 8Mpa at any time.

After the new steering gear has run for about 2500km, it is required to change the hydraulic
oil and clean the strainer in the oil reservoir. Thereforth, change the oil and do the clean of
every year or 50000km.

Check the tire regularly and keep the tire pressure meets the specification.

If the improper clearance ，block or yawing appears, find out and analyze where the failure

locates in the steering transmission system, power steering system or steering link system
and then resolve it.

Check regularly if the components of the steering system bear the improper impact. Replace

the damaged ones in time.

Do not weld the components of the steering gear and system rod in any means.

Be sure not to touch, knock or wear the tube during use. Each segment should be smooth,
and no knots.

Check the hydraulic oil every month to determine whether it is decreasing, deteriorating or
polluted. The oil should be changed at once when the problem is detected. The No. of the
new added hydraulic oil should be as same as the origin. Mixture is forbidden.

Adding oil of the steering system

Hydraulic oil for the steering system

Working oil: ATF DEXRONⅡ

Substitute oil: No.8 hydraulic transmission oil.

Caution: One steering gear can be refueled with only one kind of oil mentioned above.

It will lead to oil seal damage and leakage if unauthorized oil is used.
Consequently, the steering power will fail.

Adding oil of the steering system

Fill the steering oil reservoir with the specified hydraulic oil. Keep the engine idling, turn

the steering wheel to the left and right limit position (Do not keep the steering wheel stay at
the limit position more than 5 seconds), and continue to refuel the oil reservoir with the
hydraulic oil until the oil level do not decline and no air bubbles appear. The oil level
should reach the half height of the filter core.

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After refueling, check if there is leakage in every component.

Precaution: Keep the impurities away from the system when refueling.

Caution: Dead steering (i.e. turning the steering wheel to the limit position) is forbidden

during use. Even if necessary, do not keep the steering wheel stay at the limit
position more than 10 seconds. If the minimum turning radius tests in the
general assy test drive ground to detect the interference, it is also forbidden to
do so. When the steering wheel is turned to the limit position and the louder
noise comes from the power steering pump, you can turn the steering wheel
back a little until the noise disappears. It is forbidden to run the power steering
pump without oil. If the steering is suddenly heavy during use, park the vehicle
to check and repair.

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Content .. 74 75 76 77 ..