KING KUTTER STUMP JUMPER

[Travis_R]

Hey,

How do I get the castelated nut on the stump jumper (the big nut w/ cotter pin that holds stump jumper on to gearbox) to stay tight. It keeps backing off the shaft after a little while of using the cutter. I don't want to end up ruining the splines on the gearbox's shaft.

I thought about tack welding the nut to the stump jumper on both sides of the nut. I don't know if that would make it un-balanced or not though and possibly ruin the bearings.

Thanks,
Travis

 

[schmism]

Hey,

How do I get the castelated nut on the stump jumper (the big nut w/ cotter pin that holds stump jumper on to gearbox) to stay tight.

you tighten the nut, then put a cotter pin through the hole between the castle's ? and then it doesnt back off.....

what am i missing? (perhaps a pic is worth a thousand words?)

 

[RoyJackson]

Castellated nuts are to be used with Cotter Keys.
You should see a drilled hole through the male thread. Tighten the nut as much as you can (unless there is a specific torque callout) and align a slot in the nut with the hole in the male thread.
Use a cotter key that fits the hole snugly (it's OK if you have to tap (not hammer) the cotter key through the hole, then bend the ends of the cotter key.

 

[Farmerford]

My Bush Hogs have a hole in the end of the shaft for a cotter key, but I assume yours does not.

Here are some random thoughts.

Drill the shaft for a cotter key.

Welding would probably work until you wanted to take it off, although it might weaken the nut if it is heat treated. Can you get a grinder into the access hole to remove the weld?

Drill the nut for a safety wire.

Can you weld a small loop or washer onto the top of the nut and then safety wire it to the hub or one of the arms holding the stump jumper?

Red (not Blue) LocTite.

Distort one of the "castle turrets" with a hammer just enough to make it an all metal locknut.

Stake the first exposed thread on the shaft with a prick punch just enough to keep the nut from loosening.

Use a Jam nut.

Grind a keyway in the shaft and make a keyed washer to fit on the shaft. Then bend the edge of the washer up against a flat on the nut (like connecting rod bolts).

Drill and tap a hole in the end of the shaft (if it is not heat trated) for a safety bolt to tighten against the nut. Use a left hand thread for the best result.

 

[Soundguy]

I like the jambnut and loctight method listed above.

The tack weld idea will work.. but only needs the smallest tack.

soundguy