Primary shaft is produced, as like whole with gear. Front support the shaft is situated on the flywheel and doesn`t perceived axle efforts. Rear support (in the gear case) fixes the shaft from axial displacement. The front support is established on radial bearings (a,b).
Schemes of the front support the primary shaft of the gearbox
Sliding and needle bearings are used on the cars for front support (c). Front bearing is effectively ‘sealed for life’.
In this case, it is advisable to equip the bearing with protective washers or seals that retain lubrication and protect the clutch discs from oiling (c). Sometimes the grease is supplied to the front bearing through the grease nipple 1, which is screwed into the flywheel, through channels 2 in the flywheel (b).
The rear support of primary shaft have the radial bearings, which are fixed in the case of gearbox by the lock ring (a). When the gearbox is separate from engine the primary shaft is established on the two bearings situated in the side cap of gearbox case. See the picture 2.
Schemes of the rear support the primary shaft of the gearbox
Rear bearing of primary shaft has a protective washer (c,d). This washer save the bearing from the metal particles that can be appear from gear wear.