PTO Slip Clutch: Field Mowers Brush Cutters  -- Tractor Attachments Implements 3ph Discussion Forum and Review PTO Slip Clutch: Field Mowers Brush Cutters -- Tractor Attachments Implements 3ph Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

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 09-06-2009, 10:04 Post: 165497
UncleJoe



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 PTO Slip Clutch

I am looks for comments on a slip clutch to attach directly to my PTO.

I have a John Deere 770 tractor with several attachments.

The brush cutter and snow blower are the two that I keep breaking the shear pins on due to the large amount of stone around my property.

I did not want to have to attach a slip clutch to each piece of equipment.

Any info brand name, price, pro or con on this type of set up would be great.

UncleJoe






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 09-06-2009, 12:06 Post: 165498
greg_g



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Biggest reason not to put a common slip clutch on the tractor? Safety.Well, the common friction-type anyway. Not too many will actually fit under the shrouds. A spinning and unshrouded slip clutch is very clearly little more than an accident waiting to happen.

Not sure, but there might be a technical aspect as well; something about drive side versus driven side. When you're spinning it on the tractor end, it's going in the opposite direction that it would on the implement end.

That said, I believe there is a ratchet torque limiter that might be closer to what you're looking for. Sorta like a heavy duty version of how a driver/drill clutch works. Like the one below.

//greg//






Link:   torque limiter 

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 09-06-2009, 12:20 Post: 165499
hardwood

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 PTO Slip Clutch

Uncle J.
If you found such a thing it would have to be adjustable from machine to machine. One impliment would require more or less torque to reach the point of the slip clutch needing to slip to protect it.






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 09-06-2009, 20:15 Post: 165506
earthwrks

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Greg that link to the torque limiter appears to be a typical slip clutch. Just springs pressing on a pressure plate with friction material between.

I don't use clutches. In fact I was shearing 1/2" Grade 5 bolts all the time on minor stuff on my 5' brush hog which I use to knock down and mulch entire 3-4" caliper trees--until I used Grade 8. That was 6 years ago and no problems. My finish mower doesn't use a clutch--the drive belts have enough slip.

Now, my 6' power rake (aka Harley rake) does have a clutch only because a. it came that way and b. anything like steel rerod, pipe, conduit, concrete chunks or big roots could and have get wrapped around it. Secondarily, I have a clutch from the engine/trans so techncially it's not a locked-up drive system per se.






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 09-06-2009, 23:25 Post: 165511
greg_g



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Quote:
Originally Posted by earthwrks | view 165506
Greg that link to the torque limiter appears to be a typical slip clutch. Just springs pressing on a pressure plate with friction material between.

You're lookin' at the wrong picture EW. It's the top one labeled 1622250 torque limiter, not the one beneath it. Go back to that link, then click where it says "More Images". The difference will quickly become apparent.

//greg//






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 09-07-2009, 16:41 Post: 165520
earthwrks

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My bad Greg. I have not seen those types, but a google search only turned up Landpride post hole digger using them.

Seeing as it's on an auger leads me to believe that it may not be suitable for high-speed applications which could wear out the dogs inside the housing--there could be back-driving energy from a rotary cutter versus an auger that may see a lockup and be disengaged by the operator.

Also, having a capacity of over 600 lb-ft, I'm wondering if that's too high. But maybe not.






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 09-07-2009, 23:59 Post: 165528
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Quote:
Originally Posted by earthwrks | view 165520
I'm wondering if that's too high. But maybe not.

I'd have to see the Eurocardan documentation specific to that device. But if I'm reading my FD4 chart correctly, that falls between 66 and 67 horsepower. But without seeing the actual LN2 specs, I don't know if that's PTO horsepower - or implement transmission horsepower rating.

//greg//






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 09-11-2009, 10:05 Post: 165577
UncleJoe



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Thanks for the input guys but it looks like I'll stick with the shear pins






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 09-11-2009, 16:31 Post: 165588
kthompson



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 PTO Slip Clutch

Uncle Joe, be happy they are protecting the implement.






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Discussion Boards > Active Subjects > Messages as Posted > Field Mowers Brush Cutters Forum

Thread 165497 Filter by Poster:
earthwrks 2 | greg_g 3 | hardwood 1 | kthompson 1 | UncleJoe 2 |




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