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Typically, the slip clutch is located right in front of the right-angle gearbox, between the gearbox and the PTO shaft. And they DO need maintenance. I take mine apart every spring and run an orbital sander over the metal disks to clean off any rust, and lightly hand-sand the clutch disks to remove glaze. When reassembling, tighten all the spring-loaded nut/bolt assemblies as close to the same amount as you can. Setting final tension is trial-and-error, tighten evenly around the bolt circle until it just stops slipping in fairly heavy soil at full depth. You guess on the oil plugs is correct. If this unit is new to you, pull the cover off, drain the oil and inspect the sprockets, chain and bearings before refilling. Look for any metal particles in the oil, and look for broken, missing or chewed up rollers on the chain, and sharp edges on the sprocket teeth. Don't have a lever on mine, it runs when the PTO runs. Things that 'jump out of gear' normally do so because the gear teeth are worn, the bearings are sloppy, or the linkage is adjusted wrong, not letting it go all the way into gear. It would be better to figure out what's wrong and fix it than to try to force it to stay in gear. You may just need to adjust the preload on the bearings or stick a couple of shims in. It'd be a shame to trash the gearbox with a junkyard fix.
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