10.2
Checking and Adjusting Bearing Pre-Load
1)
Remove the prime mover drive shaft safety guards and disconnect the drive shaft from the pump
input shaft companion flange.
2)
Remove the 1" cap screw from the companion flange using a 1-1/2" wrench. Remove the flange;
clean and inspect it for wear. Replace if needed.
3)
As the bearing races wear over time they will need to be adjusted to control the pre-load on the
bearings to maintain proper operation. To check the pre-load, attach a dial indicator as shown in the
following photo and work the pinion back and forth to establish a range of axial movement. There
should be zero total axial "play" across the entire range of movement. If there is more than 0.005"
movement the pre-load should be adjusted by following steps 4-7.
4)
Remove the eight 1/2" cap screws that hold the pinion bearing retainer to the gear reducer housing
using a 3/4" wrench.
5)
Inspect the bearing seal and replace if necessary.
6)
Adjust shim stock as required to establish 0.003”-0.005” of pre-load on the pinion bearing. If for
example there is 0.010” of axial “play” as measure from step 3, a total of 0.013”-0.015” of shim
stock thickness shall be removed from the shim set.
7)
Reinstall the pinion bearing retainer and torque screws per table in
Appendix C
.
8)
Replace the companion flange. Apply Loctite® Threadlocker Blue and tighten cap screw just until
washer slightly deflects (approx. 100 ft-lbs).
Revision K 03/12/2019
MSI - A Division of Dixie Iron Works, Ltd. All rights reserved.
Page 63