King Long XMQ6900 Series, Operating Manual

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Common trouble and elimination
6-6
Fault
symptom
Possible cause Eliminating method
6) Fatigue of the front leaf spring,
looseness of the "U" -bolt or
damage of the central bolt 6) Replace the faulted parts
Failure of
steering
wheel return
to center
1. The steering system
1) Difficulty in the gear
engagement
2) Malfunction of power steering
system
3) Improper contact with the
power piston
4) Fatigue of the return spring
5) Malfunction of slide valve
2. The front axle
1) Excessive caster angle of the
king pin
1
） Adjust the gear engagement
2 ） Overhaul and eliminate trouble
3
）
Adjust or replace the power piston
4
）
Replace the spring
5
）
Check diameter of the slide valve
and the housing and replace them
if necessary
1) Check and adjust the front wheel
alignment
Misalignment
of the steering
wheel
1. The alignment of front wheel
incorrect
2. There has fatigue and damage
in the front plate spring
3. Bending of the front axle
4. Unsmooth of the braking
5. Looseness of the front hub
bearing nut
6. Inequality of the tire pressure
7. Tires with different dimension
applied
1. Check and adjust the front wheel
alignment
2. Replace the faulted spring
3.
Adjust or replace the front axle
4. Please refer to the chapter
"braking"
5. Tighten to specified torque
6.
Inflate to the given pressure
7. Replace the tire by the correct
type
Disproportion
or untimely
tire wear
1. The front axle
1) Incorrectness of the wheel
alignment
2) Abrasion or wreckage of the
hub bearing and looseness of
the bearing nut
3) Over looseness or tightness of
the ball stud, the king pin and
the bushing
2. Tire
1) Tire pressure incorrect
2) Misalignment between the tire
and the wheel
1
） Check and adjust the front wheel
alignment
2 ） Replace the bearing or tighten nut
to specified torque.
3
） Make an adjustment and replace
the faulted parts as needed
1
） Supply to the given air pressure
2 ） Replace the tire or the wheel