How tight for slip clutch bolts

craigco · Jun 25, 2019

How tight do you tighten slip clutch
bolts? Replaced friction disc in a
Hesston 4550 baler. Nuts were tightened
done 4 threads on the bolts. It was
assembled wrong when I got it. Should I
start at the same or looser? Thanks

SVcummins · Jun 25, 2019

There?s a measurement in the manual for free length of the spring when properly adjusted another way is to run them tight then operate the baler awhile and adjust them so the slip clutch is just warm after an hour of running

Dean · Jun 25, 2019

It's a trial and error process.

It needs to be tight enough to carry the load of your baler in almost all circumstances yet not so tight that it does not protect your tractor and/or baler. Moreover, it needs to slip once in awhile to prevent corrosion lock.

I would probably start as it was originally assembled. Mark the unit with chalk of yellow tire crayon to see if it slips. Loosen each bolt small equal amounts until it slips then tighten just enough to stop slippage in normal operation.

Dean

jeffcat · Jun 25, 2019

Here is the way to adjust a Gravely slip clutch. Use a feeler gauge. Others you jam the auger and use a torque wrench for a precise slip. Lastly you tighten all of the nuts and then back them off one full turn. As others have said, hit or miss. See if you can down load the machine's manual off the net.

Russ from MN · Jun 25, 2019

On our brush cutter I mark it with a felt pen and if it slips just a little when starting that's where I leave it. There are specific measurements in the owners manual. Once I had it a little too loose and looked back as I was going through some bigger brush and it was smoking. I tightened it a little and it was fine, I haven't replaced the disc yet, seems fine.

Oliver 500 Wa · Jun 25, 2019

When I worked at a shop that made parts for Freeman balers we built the slip clutches. The bolts were tightened down until the clutch would not slip at a specific torque. I do not recall the value they used, but each clutch was assembled and the bolts tightened to compress the springs to a specified length. The the assembly was put on a "dummy shaft" and then we used a big torque wrench to test and make the final adjustments.

Part Time Pete · Jun 25, 2019

If I remember correctly,my NH 316 calls for 600 ft lbs. I block the plunger and put a six foot bar on it - I go by feel, but I try to put 100lbs. of force on the end of the bar.
When I first got it, it was set way too tight and wouldn't slip at all. That puts a tremendous amount of shock on the drive line
Pete

Texasmark1 · Jun 27, 2019

If I don't have a reference point, I back off till it slips rotating without any grass to ensure I have everything shined up....not rusted in place...disc to plate. Then tighten a few threads at a time till I can mow hard and it have just quit slipping.....and add a couple more threads.

How tight for slip clutch bolts

craigco

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SVcummins

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Dean

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jeffcat

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Russ from MN

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Oliver 500 Wa

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Part Time Pete

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Texasmark1

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