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slip clutch adjustment?

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Author  [Modern View]

04-16-2012 19:08:49

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does anybody know how to adjust a slip clutch. I think my slip clutch might be stuck and I would like to rebuild. the tiller works great, but would hate for the clutch to be stuck and damage the tiller. any help would be great . the slip clutch would be used on a 6 foot tiller, my tractor is 40 horsepower 30 p t o . thanks, not a bad buy for $350.

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Sean in PA

04-17-2012 11:55:28

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 Re: slip clutch adjustment? in reply to Fordfarmer, 04-16-2012 19:08:49  
Quoting Removed, click Modern View to see

I am learning a lot from this thread. I have been loosening the springs on the slip clutch on my Woods rotary mower once a year to make sure that it still slips, and I have been returning them to their original setting just by the number of turns on the nut. I didn't know that the length was the key thing to watch for.
I just have a couple of questions. Are all springs on all slip clutches created equal? I mean is your chart a universal chart that's applicable to all slip clutches or is your chart for a specific brand or model? If it is a universal chart, do you think that you could scan it and post it?

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04-17-2012 12:12:37

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 Re: slip clutch adjustment? in reply to Sean in PA, 04-17-2012 11:55:28  

Compression height/HP varies by manufacturer.


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04-17-2012 10:40:09

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 Re: slip clutch adjustment? in reply to rgvnaa, 04-16-2012 19:08:49  
A six foot tiller is a lot of tiller for 30 pto hp unless you have really soft soil!

The slip clutch is adjusted by tightening the spring loaded bolts to a certain spring length. I store mine under cover with the spring bolts loose and install it and adjust the springs before I start mowing. That keeps it from rusting shut. My springs must be compressed to 1-1/16" to protect the 60HP gearbox on my mower. Loosen all the spring bolts and you can see the clutch plate(s). Or remove them and take the clutch apart.
If you don"t know what the setting should be, you can try a trial and error approach. Tighten them down til they just start to not slip. Count the turns so they are tightened uniformally. Then take two turns and try to till. If it slips too much, take two more turns. Keep doing this until it doesn"t slip. The back off till it just slips occasionally. Tighten it back up again another two turns.THEN MEASURE THE COMPRESSED SPRING LENGTH AND WRITE IT DOWN.Loosen the springs when you"re done to leave the clutch free and store the clutch where it won"t get rained on and rusty. When you want to use it, compress the springs to the correct length. I have a table somewhere that gives approximate settings versus HP and i"ll see if i can find it. If I do, I"ll post it.

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04-17-2012 10:47:13

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 Re: slip clutch adjustment? in reply to Jerry/MT, 04-17-2012 10:40:09  
The chart i have says for 30HP @540 rpm the spring length should be 28 mm or 1.102 inches ~ 1-1/8". That will give you a starting point.

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04-16-2012 20:37:05

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 Re: slip clutch adjustment? in reply to rgvnaa, 04-16-2012 19:08:49  
As Keith, below, says, it is imperative that you slip all slip clutches at least once each year to prevent loss of protection due to corrosion.

I count turns when loosening the spring nuts and retighten the same number of turns.

Most clutch manufacturers provide manuals with spring height/HP data to use when adjusting your clutch to your tractor.


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04-16-2012 20:08:57

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 Re: slip clutch adjustment? in reply to rgvnaa, 04-16-2012 19:08:49  
Quoting Removed, click Modern View to see i don't know about the slip clutch, but i wouldn't run it with that pto shaft. a friend of mine almost lost his b$lls with a shaft just like that. chuck

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Keith Williams

04-16-2012 19:45:33

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 Re: slip clutch adjustment? in reply to rgvnaa, 04-16-2012 19:08:49  
Most clutch makers tell you to slip the clutch at the start of the season to make sure it is not stuck. To do that just release the pressure on all the springs and spin the pto with the tiller in the ground.
I would measure the spring compression before I started and retighten them the same after ya spin it. If you have a manual, it would tell you the amount of compression for the springs.

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