Page 913 - Workshop Manual - Aumark (BJ1051)

31A-67
Transmission (646b/651b)- upper cover assy

Overhaul

1. Disassemble the fork shaft assy
(a). Remove each shifting of gear shift fork and the
steel thread locking wire and catch bolt on the
gear shift block.

(b). Knock out each shifting of transmission fork
shaft and take out the each shifting of shift fork,
self-locking steel ball, lock ball spring and gear
shift block.
Hint:
The lock balls will fly off easily while removing the
gear shift fork; cover the spring eye of the lock ball
with rags to prevent the balls from flying off.
Notice:
• When the lock ball spring of the fork shaft is
compressed to 26.1mm, the pressure of the
spring shall be 80.71 N; if not, replace with a
new one.
• All the fork shafts shall be removed in any
order so as to ensure that the interlock pin is
at neutral position while removing the lock
ball spring.
2. Remove the pressure pin
(a). Loosen the plug screw.

31A

(b). Take out the pressure spring of the pressure pin
and take out the pressure pin.
Hint:
Make marks respectively on the springs of the left and
right pressure pin springs in order to identify conveniently
during the installation.
Notice:
• When the right pressure spring in the
illustration is compressed to 34.5 mm, the
pressure shall be 43.35 N; if not, replace with
a new one.
• When the left pressure spring in the
illustration is compressed to 39.5 mm, the
pressure shall be 36.29 N; if not, replace with
a new one.

Page 913