Service - 172 RT80Q Operator’s Manual
500 Hour
Trencher
Adjust Headshaft Bearing
Adjust headshaft bearing every 500 hours.
To adjust:
1. Remove cover. Remove bolts attaching
trenching attachment motor to gearbox.
2. Remove bolt and washers in left end of
headshaft.
3. Support gearbox with hoist and slide it off
headshaft.
4. Install spacer (p/n 184-044) in place of
gearbox while checking bearings.
5. Replace bolt on end of headshaft.
6. Remove chain from headshaft sprocket.
7. Turn chain sprocket until headshaft sprocket turns. When properly adjusted, it will take two hands and
some effort. If it turns easily, remove a shim.
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