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Slip Clutch PLUS Overrunning Clutch?
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Topic: Slip Clutch PLUS Overrunning Clutch?
    Posted: 14 Jun 2023 at 8:08pm
It seems to me that a CA needs BOTH a slip clutch and an overrunning clutch.  I didn't find any combos.  Is there such a combo?  I want to absolutely protect from damage and from pushes from a brush hog or similar high mass rotating device.  Doesn't having those two in series cause difficulties connecting or is there that much slack in the typical PTO drive shaft?

I guess the term overrunning is imprecisely used.  By it I mean uni-directional torque application with 'freewheeling' in the opposite direction.  Some use the term overrunning to mean a friction (slip) clutch.

This claims to be a combo but isn't really clear.


Sorry for all the newby questions :(


Edited by dfwallis - 14 Jun 2023 at 8:27pm
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 8:35pm
Most better cutters have a slip clutch on them. The over run can be be on cutter or tractor either way. Most go on tractor.                MACK
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 8:47pm
Originally posted by MACK MACK wrote:

Most better cutters have a slip clutch on them. The over run can be be on cutter or tractor either way. Most go on tractor.                MACK

Several things I've looked at just say shear bolt :(
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Allis dave View Drop Down
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Joined: 10 May 2012
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Points: 3015 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Allis dave Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 8:58pm
I shear bolt could be ok too. Use a soft grade2
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KJCHRIS View Drop Down
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Joined: 21 Dec 2015
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Points: 950 		Post Options Post Options   Thanks (1) Thanks(1)   Quote KJCHRIS Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 9:32pm
If your cutter doesn't have a slip clutch now it likely has a shear bolt. It can be on either end of shaft; tractor end coupler has 2 - 1/4" or 5/16" bolts, on the gearbox end it's likely a 3/8" bolt thru shaft coupler & shaft and no keyway slot in coupler.
 My 7' JD rotary cutter uses grade 5- 3/8" bolt style according to manual, I've broken maybe 5 or 6 in 20+ years. 

 Most farm & home type stores can get you an inexpensive low HP over running clutch. 

  The units you posted "are" a combination unit, but they're quite expensive. The over running clutch is in the center, slip clutch is the outer parts. 
 We had similar ones for front mounted 8' & 9' snowblowers in a snow removal fleet. 
AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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Joined: 29 Jan 2013
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Points: 3830 		Post Options Post Options   Thanks (1) Thanks(1)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 10:49pm
you want part number sma 971-68386 over running clucth for your brush hog slips on your pto and your brush hog pto shaft slips on it  you may have to shorten brush hog pto shaft 4 inches , 2inches each side you dont want it to bottom out  
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Gary Burnett View Drop Down
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Joined: 11 Sep 2009
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Points: 3044 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Gary Burnett Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 2023 at 11:14pm
AC brush hog has both
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 7:52am
Originally posted by KJCHRIS KJCHRIS wrote:

  The units you posted "are" a combination unit, but they're quite expensive. The over running clutch is in the center, slip clutch is the outer parts. 
 We had similar ones for front mounted 8' & 9' snowblowers in a snow removal fleet. 

Cost isn't a concern (within limits).  I am interested in one with adjustable torque/slip though.  A 26hp tractor needs a different setting than a 60hp tractor.
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Joined: 12 Sep 2009
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Points: 8540 		Post Options Post Options   Thanks (1) Thanks(1)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 10:21am
Whatever you do try to keep slip clutch out of weather. The discs tend to "rust" to the plates and no longer slip. Wrap it with some kind of weather resistant material if parked outside between use. Most manuals will say to loosen and spin to free up before use then retighten. Who does that??
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Points: 2929 		Post Options Post Options   Thanks (1) Thanks(1)   Quote ACinSC Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 11:01am
My manual says that Steve . Like you said I've never done it . When ours was new Dad was wearing his earmuff/radio and didn't hear it slipping . After a while he noticed the paint on the guard was turning black . Happy to say the dealer gave me a new slip clutch . 
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dfwallis View Drop Down
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Points: 708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 1:22pm
Originally posted by dfwallis dfwallis wrote:

It seems to me that a CA needs BOTH a slip clutch and an overrunning clutch.  I didn't find any combos.  Is there such a combo?  I want to absolutely protect from damage and from pushes from a brush hog or similar high mass rotating device.  Doesn't having those two in series cause difficulties connecting or is there that much slack in the typical PTO drive shaft?

I guess the term overrunning is imprecisely used.  By it I mean uni-directional torque application with 'freewheeling' in the opposite direction.  Some use the term overrunning to mean a friction (slip) clutch.

This claims to be a combo but isn't really clear.


Sorry for all the newby questions :(


I went ahead and ordered the low end one:  https://www.bare-co.com/files-pto2002-pto64

For 40hp and under...from yesterday's tractors.  Quite pricey even for that one :(
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Joined: 12 Sep 2009
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Points: 7459 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DSeries4 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 2:45pm
I do not think there is such a combo having both in one unit.  A slip clutch and/or shear pin is meant to protect the mower and PTO driveline, and is part of the mower.  The over running clutch disconnects the mower's inertia from pushing the tractor, and I will say it makes a huge difference.  With your foot on the clutch, the tractor stops right away and you can shift gears without grinding.  I have been using one for over 15 years - works great!
'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 708 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 5:20pm
Originally posted by DSeries4 DSeries4 wrote:

I do not think there is such a combo having both in one unit.  A slip clutch and/or shear pin is meant to protect the mower and PTO driveline, and is part of the mower.  The over running clutch disconnects the mower's inertia from pushing the tractor, and I will say it makes a huge difference.  With your foot on the clutch, the tractor stops right away and you can shift gears without grinding.  I have been using one for over 15 years - works great!

There is.  I bought it, see above.  By Bareco of NZ/AU.
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MACK View Drop Down
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Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2023 at 9:28pm
AC cutters had a over run clutch on the slip clutch.                MACK
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