1. Squeeze the retaining ring of the input shaft with a puller...
2.... and remove it from the groove of the gear block.
3. Turn out the centering plug of a primary shaft.
4. Press the rear bearing of the input shaft from the neck of the gear block...
5.... and remove the bearing from the shaft.
Note: The circlip and 5th gear that hold the input shaft rear bearing to the shaft were removed during the transmission disassembly.
6. Unclench the retaining ring of the block of drive gears of III and IV gears...
7.... and remove the ring.
8. Remove the input shaft itself from the gear block.
9. If necessary, press the block of gears of III and IV gears from the journals of the block of gears of I and II gears, as well as reverse gears...
10.... and separate the gear blocks.
11. Inspect the input shaft and gear assembly. On the working surfaces of the gear teeth there should be no chips, signs of wear and chipping, on the ends of the gear splines - chips, chipping and jamming. The bearing, lubricated with gear oil, should rotate easily, without noise, knocking or jamming. On the surfaces of the rolling elements there should be no traces of fatigue damage. The bearing cage must not be damaged. When replacing the input shaft, check for ease of movement in the hub of the clutch disc.
12. Assemble the input shaft in the reverse order of disassembly. Press the rear bearing onto the shaft, applying force only to the inner ring, otherwise the bearing will be damaged.