Disassembly of the gearbox shafts is necessary to replace shaft parts.
Removing the gearbox is discussed in the article - “Removing the gearbox”
Disassembling the gearbox is discussed in the article - “Gearbox Repair”
Disassembling the gearbox input shaft
Use pliers to open the locking ring
And remove it.
Remove the spring washer.
We rest the end of the outer ring of the bearing on the jaws of the vice.
Use a hammer with a plastic striker to strike the end of the input shaft
and press the bearing.
Use pliers to open the installation ring
and remove it.
Having moved the synchronizer locking ring, use pliers to release the locking ring
and remove it.
Remove the blocking ring...
and synchronizer spring.
The blocking rings of the synchronizers of other gears are removed in the same way
Assemble in reverse order
Disassembling the secondary shaft of the gearbox
Remove the bushing and 1st gear gear assembly with the blocking ring from the rear side of the shaft.
Remove the bushing from the gear.
Remove the synchronizer clutch for engaging 1st and 2nd gears.
Remove the synchronizer hub.
Remove the second gear gear assembly with the blocking ring
Remove the third and fourth gear synchronizer clutch from the front end of the secondary shaft
Holding the secondary shaft in a vice with soft metal jaws, remove the locking ring with pliers
Remove the spring washer (it is installed with the convex side towards the front end of the shaft).
Remove the synchronizer hub for the third and fourth gears
Remove the third gear gear assembly with the synchronizer blocking ring.
Assemble in reverse order