Gearbox assembly: gearbox shafts
Overhauling the gearbox
Check the condition of the gear front coupling dogs. They must not be damaged in any way and must have sharp
edges.
The idle gears must rotate freely on their shafts.
When refitting, make sure the circlips are correctly positioned.
Check the needle roller bearings for wear.
The threading and the splines of the shafts must be in perfect condition.
Check the condition of the gear selection mechanism parts.
Engage the gears and check that the gearbox control does not jam (selector fork-gear groove and fork pin -
desmodromic drum groove) due to incorrect end float. Correct clearances by shimming the gearbox shafts and drum
with suitable shims.
For total end float of gearbox shafts and selector drums, refer to Sect. C 1.1,
Inspecting the gear selector forks
Visually inspect the gear selector forks. Bent forks must be changed as they may lead to difficulties in gear changing
or may suddenly disengage under load.
Use a feeler gauge to check the clearance of each fork in its gear groove.
If it exceeds the service limit, establish whether it is necessary to change the gear or the fork by referring to the
limits specified for each part (Sect. C 1.1,
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