User Guide

5-21C
Shift mechanism
Shift forks 1
Check plate A for wear. The forks are 4.8mm - 4.9 mm (0.1889 in -
0.1929 in) thick in a new condition. The wear limit is at 4.6 mm (0.1811 in).
Shift roller 2
Check the shift grooves B for wear.
Check the fit of the shift roller in the grooved ball bearing
3.
Grooved ball bearing
3
Check it for smooth movability.
Shift rolls
4
Check the shift rolls for pressure marks and cracks.
Shift rails
5
Check the shift rails for eccentricity on a planar surface. Check the shift
rails for score and seizing marks. The smooth movability of the shift forks
on the shift rails must be ensured.
Sliding plate
6
Check it for wear at the points of engagement C.
Check the return surface
D on the sliding plate for wear (replace it in case
of severe notching).
Check the guide bolts
E for tight fit and wear.
Shift mechanism
Preassemble the shift shaft and check the clearance
F between the
sliding plate
6 and the shift element. The clearance must be 0.40 -
0.80 mm (0.0157 - 0.0315 in).
F
7
11
6
8
9
10
Preassembling the shift shaft
– Secure the short end of the shift shaft in a vise (use
protection jaws).
– Mount the sliding plate
6 with the guide bolt facing
downward and engage the guide bolt at the shift
element.
– Mount the pressure spring
7.
– Slide on the spring guide
8, slide the return spring 9
with its dropped end facing upward over the spring
guide and lift the dropped end over the
counterbearing bolt
bl (see photo).
– Mount the stop disc
bk.