H&S GM 170 Operator's Manual And Parts List page 32

MAIN DRIVE SHAFT BEARINGS
Main drive shaft bearings are greased by 2 of the remote zerks in grease bank under the step by the mill
cover. For bearing replacement, follow steps 1-5 from the previous Belt Replacement section in this
chapter. Then:
1. Disengage PTO, shut-off tractor and remove key.
2 Remove the hydraulic pump belt shield.
3. Release the spring tension on the hydraulic pump drive belt.
4. Remove the hydraulic drive pulley on the end of the main shaft.
5. Remove the drive chain to the transfer shaft.
6. Remove the PTO.
7. Remove the flywheel and flywheel clutch.
8. Remove the back left flywheel shield.
9. Remove remote grease lines from bearing blocks.
10. Remove main driveshaft cover with shaft and bearings.
11. Remove shaft and bearings from cover.
12. Loosen set screws and remove bearings.
13. Install new bearings and tighten set screws.
14. Reinstall components in reverse order.
15. The bolt securing the PTO to the shaft should be tightened to seat
the bearings. Then back the bolt out and tighten to 6-10 inch lbs.
of torque. Secure the bolt with wire to PTO yoke.
ENGAGING PIN
The pin used to engage and disengage the mill/blower drive sheave should
be checked periodically for excessive wear or improper seating. Excessive
wear on the pin or the hole in the hub that the pin engages, could result in
the pin accidentally disengaging in the middle of mill and blower operation.
Both components should be replaced if worn.
IMPORTANT: Do not start the PTO until the pin is positively engaged.
Using the PTO to engage the pin will cause premature pin failure.
SERVICE
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