Star EV BN72-11-AC-D, Owner'S And Service Manual

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4. Possible reason and troubleshooting for malfunctions of mechanic system.
System Malfunction Possible Reason
Troubleshooting
Steering
system
Steering heavy
Clearance of tension rod ball is too big Change
Steering knuckle and master pin is not lubri-
cated
Add lube
Steering shaft or its plastic cover is worn out Change
Unstable wheels
Rack of redirector is worn out Change redirector
Screw plug of redirector is too tight Adjust
Toe-in is adjusted improperly Adjust
Bearing of front wheel is worn out Change
Tie rod ball and joint is worn out Change tie rod
Redirector is loose Tighten
Driving
system
Deflected running
The pressure of the two front tires is different Inflate
Toe-in is too big or too small Adjust
Tightness of the left and right drum bearing of
front wheels is different
Adjust
Brake of one wheel is too tight Adjust or change
Spring shock absorber is abnormal Change
Front suspension is loose Change
Abnormal tire fray
Tire pressure is abnormal Inflate
Toe-in is improper Adjust
Drum bearing loose Change
U type bolt of leaf spring is loose Tighten
Rim is distorted or frame is distorted Tighten
Brake force of each wheel is different Adjust
Overexerting accelerate or braking frequently Alter operation
Brake system
Brake fail
Master cylinder and/or wheel cylinder is dam-
aged or leaking oil
Check, eliminate,
change
Brake fluid is insufficient or empty Add fluid
Air enters into oil pipe Let air out
Free travel of brake pedal is too long or the
clearance of arrester is too big
Adjust
Brake drum is worn out or distorted Change
Master cylinder leaks oil internally Change
Braking deviation
The clearance of left brake drum shoe and right
brake drum shoe is different
Adjust
Oil is on one arrester’s brake shoe Dispose/change
Tire pressures are different Repair/change
One wheel cylinder’s piston is blocked Adjust
Wheels are aligned improperly Adjust
Brake drum becomes out of round Change