Simple way if you can't find a manual - typically, if the shaft sits for long periods it will likely rust together, making adjustment difficult because the clutch won't slip.
1. There are several bolts that adjust spring tension on these clutches - once you find them, you can loosen ALL of them by maybe 2-3 turns - make sure they ALL get loosened by the same amount.
2. Start the PTO, try to till a bit. The clutch should break loose and slip. Only do this for 5-10 SECONDS. This will "clean the gunk out", so to speak. Be careful touching the clutch with bare hands, it will probably be pretty warm.
3. Put all of your tensioning bolts 2/3 of the way back to their original tension (if you loosened them 3 turns, put them 2 turns back toward their original tightness) - do this in a PATTERN, like you would do when tightening the lug nuts on a car wheel.
4. If the clutch is still warm, let it cool.
5. Go back and try to till an area briefly - no more than 30-60 SECONDS. Listen for "bad" noises -
6. Turn off the tractor and CAREFULLY feel the clutch - if it is noticeably WARMER, it's been slipping.
7. If so, tighten all the tension bolts the REST of the way, let things cool, and repeat 5 and 6.
8. If the clutch was set correctly before you started, it should end up right back where it belongs (only less rusty)
Temperature is the simplest test to see if the clutch is slipping - doesn't matter if the tiller is chain or gear drive, slipping will take out the clutch eventually. It should ONLY slip if the tiller hits an "immovable" object.
HTH... Steve
