201-00-3 Suspension System
Diagnosis and Test (Continued)
1. Oil leakage. A layer of oil film is allowed to be
(exuded) attached on front and rear shock
absorbing devices, which is normal. Oil
penetration refers to a situation that a layer of
thick oil film accumulates outside the shock
absorbing housing, and generally is easy to be
noted owing to a mass of absorbed dust. The
phenomenon of oil penetration during shock
absorption is a manifestation of the normal
function of the automobile, thus the shock
absorber is not required to be replaced. Leaking
phenomenon refers to a situation that the
suspension of the whole shock absorbing device
is covered with the leaked oil, and simultaneously
the oil fluid can drop off onto the ground from the
suspension.
If case of such circumstances:
– Check that the observed oil film is just from the
shock absorbing device.
– If worn or damaged, the shock absorbing device
should be replaced.
2. Decline of the vehicle body: The problem of
automobile decline is solved commonly through
replacing front and rear damping springs, because
the designed shock absorbing device belongs to a
hydraulic type damping device. Unlike a
suspension spring, the designed shock absorbing
device can not be used for loading and bearing
weight. Therefore, the problem of automobile
decline cannot be solved through the method of
replacing the suspension device.
3. Note: When a suspension device is damaged, pair
replacement is not needed.
Replace a pair of new shock absorber. In the past, we
would recommend that if a shock absorber is damaged,
a pair of shock absorber can be replaced. Now that
new technology and enhancing management are
adopted during manufacture and the sealing
technology is improved, the working reliability of the
shock absorber is remarkably improved.
Automobile Inspection
1. Inspect air pressure of all tyres.
2. Inspect tyres to confirm positioning of the ball
head of the tie rod, dynamic balancing of the tyre
and whether tyres are cracked or abnormally
bulged.
3. Inspect optional suspension equipment of the
automobile, such as suspension of the heavy-duty
towing trailer. The suspension is firmer than the
standard suspension in the running process.
4. Inspect whether the automobile is overloaded or
not. Inspect whether the luggage carrier contains
heavy object.
5. After the above procedures are finished, perform
road test to confirm the failure mentioned by
clients.
Inspection through Automobile Hoisting
1. Noise: Loosening of the suspension or accessories
of the suspension assembly would cause noise.
Inspect and tighten the suspension assembly and the
accessories thereof. If the lining sleeve of the lower
bracket is damaged, replace it. Inspect whether front
and rear suspension assemblies are externally
damaged or not.
2. Bottom / rebound: Inspect the travel for the
rubber shock absorbing sleeve. If damaged or lost,
install a new shock absorbing sleeve. Inspect
whether the shock absorbing sleeve is overloaded
or not. If the shock absorbing sleeve is overloaded,
replace it.
3. If abrasion of the shock absorber is found, only
the damaged shock absorber is to be replaced.
Working Rack Test
The inner part of the shock absorber is fully filled with
compressed gas, and the shock absorber should be
completely stretched when there is not limit. If the
shock absorber is found not to be completely stretched,
this means that it has been damaged. Replace a new
shock absorber. Inspect the total length of the shock
absorbing device, if the shock absorbing device does
not meet the requirements of the total length, which
means that a certain part among parts does not meet
the requirements, replace the shock absorbing device.
When the suspension device is at the vertical position,
compress the suspension assembly and allow it to
stretch three times, through which the intake gas
through the pressure chamber in the treatment process
is cleared.
Benni Mini
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