Input Shaft: Service and Repair

TO REMOVE
1. Remove the oil catcher from the bearing housing and press out the input shaft. Save the front bearing, spacer and shims. Use dolly 83 90 098.





2. Take care not to damage the connecting pipe while pressing.





3. Press the rear roller bearing off the input shaft. Use fixture 87 90 636 and ring 87 90 933.





Legend
1. Connecting pipe for lubrication
2. Input shaft
3. Roller bearing
4. Bearing race
5. Bearing housing
6. Shims
7. Spacer
8. Roller bearing
9. Bearing race
10. Chain sprocket
11. Nut
12. Rear oil catcher
13. Front oil catcher
14. Bolts

4. Use a drift to remove the bearing races from the housing. Use a suitable ring-shaped support.





TO ASSEMBLE
1. Use drift 78 41 075 and a ring-shaped support to press the rear bearing onto the shaft. Remove the shims during pressing.





2. Press the bearing races into the bearing housing. Use tools 83 90 312, 83 90 189 and a ring-shaped support. When pressing in the inner bearing race, turn the tool so that the smaller radius is used. The bearing race will otherwise not bottom.





3. Fit the input shaft, shims, spacer and bearing into the bearing housing. Select shims and spacer of known size so that axial play will deliberately be obtained. Place the shims between the rear bearing and the spacer.





4. Oil the bearings and press them together with a force of 3 tons until they meet the spacer. Rotate the bearing housing while pressing against both the upper and lower bearings, 40 times in each direction, so that the rollers will be firmly in contact. Use drift 78 41 075 and a ring-shaped support to avoid damage to the connecting pipe.





5. Maintain the press force of 3 tons. Fit the dial indicator to a bearing housing bolt hole. First apply load to the bearing housing towards the upper bearing and then towards the lower bearing, and read the axial play.
Compensate for the axial play by fitting shims which are available in thicknesses of 0.10, 0.15, 0.25 and 0.50 mm (0.004, 0.006, 0.009 and 0.019 in).
If correctly shimmed, the bearings should have no rolling resistance and no play. If zero play cannot be obtained with the available shim thicknesses, change the spacer. Spacers are available in thicknesses of 8.08, 8.09, 8.10 and 8.11 mm (0.3181, 0.3185, 0.3188 and 0.3192 in).
6. Press the front bearing off the input shaft and fit the calculated combination of shims. Place the shims between the rear bearing and the spacer. Then fit the front bearing on the input shaft in the bearing housing and press the bearings together with a force of 3 tons. Rotate the bearing housing as described in item 4. above. Check the bearings for rolling resistance and play.





7. Fit the oil catcher into the bearing housing.