Primary shaft of the gearbox assembly: 1 – primary shaft nut; 2 – 4th gear pinion; 3 – 3rd gear pinion; 4 – reverse gear pinion; 5 – inner ring of the front bearing; 6 – primary shaft; 7 – 1st gear pinion; 8 – 2nd gear pinion; 9 – rear bearing of the primary shaft
You will need:
- key "for 32"
- bearing pressing mandrel
- two screwdrivers
- beard
- hammer
Thoroughly clean, rinse and dry the input shaft.
The primary shaft is a block of drive gears, one part of which is made on the shaft, and the second is pressed onto it with great tension. Therefore, the design of the primary shaft is non-separable and only the bearings can be replaced on the shaft.
The defect detection of the primary shaft, its gears and bearings is similar to the defect detection of the secondary shaft (see subsection 11.1.3.).
1. Loosen the primary shaft nut (see subsection 11.1.3., operations 1–6).
2. Place the shaft in a vice with soft metal pads and press the rear bearing using two screwdrivers.
3. Using a suitable mandrel, press the rear bearing onto the shaft until it stops, applying force only to the inner race of the bearing.
4. Turn the shaft over and press the inner race of the front bearing.
5. Using a suitable mandrel, press the inner race of the front bearing onto the shaft until it stops.