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2. Brake
Trouble and possible cause Possible remedy
A. Ineffective brake
(1) The shifting block broken.
(2) Friction disk is excessively worn-out.
(3) The steel ball is distorted
(4) Excessive pedal free travel.
B. Two wheels can not be braked simultaneously
(1) Right and left pedal travel different.
(2) One pressure disk is excessively worn-out
C. Brake disengaged incompletely and overheated
(1) The return spring weakened
(2) Brake pedals will not return
(3) Short pedal free travel
(1) Replace shifting block
(2) Exchange friction disk
(3) Replace steel ball
(4) Readjust pedal free travel
(1) Readjust pedal travel
(2) Replace pressure disk
(1) Replace spring
(2) Check return spring for damage, shaft
for being gripped and remove them.
(3) Readjust pedal free travel
3. Transmission box
Trouble and possible cause Possible remedy
A. Abnormal sound in transmission box
(1) Transmission box bearing or rolling needle
excessively worn out or damaged.
(2) Abnormal meshing of main drive gears.
(3) Shaft splines and gear splined hole worn out
B. Gear engagement out of order
(1) For excessively worn out or deformed
(2) For shaft locking spring weakened
(3) Tooth profile or spline excessively worn out
C. Transmission box overheated
(1) Short clearance of bearing or gears
(2) Insufficient or excessive lubricating oil
(3) Deteriorated lubricating oil
(1) Check and replace worn out parts.
(2) Examine meshing traces and backlash and
adjust them in accordance with regulations
(3) Replace worn out parts
(1) Replace fork
(2) Replace spring
(3) Replace worn out parts
(1) Readjust the clearance
(2) Add or drain out lubricating oil to specified
level
(3) Replace lubricating oil
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