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ii. Trouble shooting of transmission box
Phenomenon
Cause
Solution
Gear engagement in fast,
slow and neutral positions
are not reliable
Back-end bolt of main shaft is loose and
the round nut is loose
Detach the main shaft’s back-end bolt,
protecting bush, retighten the round nut
and then refit the protecting bush and
bolt, and retighten them
Block’s wear is too heavy
Replace block
Driving bevel gear is loose
Tighten round nut
Wear of upper hole of shift block is too
heavy
Replace shift cam and shift block
Positioning spring inside main shaft fails Replace spring
Main shaft bounces forward and backward
due to loosening of gland bolt of the rear
part of transmission box,
Retighten gland bolt
U
n
co
m
p
le
te
d
g
ea
r
en
g
ag
em
en
t
Interference during gear shifting caused
by deformation of shift lever
Straighten shift lever or replace it
Wear of fork
Readjust reverse cable or replace fork
Reverse cable fails
Readjust cable or replace it
Reverse shaft is loose
Tighten back-end bolt of reverse shaft
U
n
co
m
p
le
te
d
g
ea
r r
ev
er
si
n
g
Fork shaft is seized
Clean the junction face of fork shaft
and pusher to let fork shaft be able to
rotate easily
Reverse shaft is loose, which causes
seizure of gear
Retighten back-end bolt of reverse shaft
Uncompleted movement of
reverse gear
Spring of reverse shaft fails
Replace spring