Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

need help on overrunning clutch!

Welcome Guest, Log in or Register
Author 
ironpony

01-31-2008 04:41:43




Report to Moderator

Can someone give me a lesson on how the pto overrunning clutches work? I want to hook up two pto's two one main shaft and want to protect either tractor if either one would stop?

Thanks

ironpony




[Log in to Reply]   [No Email]
KIP in MX

01-31-2008 16:57:24




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
Whatever you want to call it, it needs to be a sprag type clutch. We have two engines feeding one main driveshaft thru a combining gearbox to the transmissions on some of our helicopters and each engine has itīs own sprag inside the c-box. If either engine shuts down, the clutch allows the engine shaft to stop, while other engine still powers the main driveshaft. Now if either of your engines would be overloaded by running the PTO by itīs self, you have another problem to overcome. Isnīt an over running PTO clutch basically the same thing as a sprag?

[Log in to Reply]  [No Email]
Janicholson

01-31-2008 19:02:01




Report to Moderator
 Re: need help on overrunning clutch! in reply to KIP in MX, 01-31-2008 16:57:24  
YES JimN



[Log in to Reply]  [No Email]
Mike M

01-31-2008 06:55:14




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
Sounds more like you want a slip clutch on each shaft.



[Log in to Reply]  [No Email]
Jeff-oh

01-31-2008 06:28:20




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
oldmax hit it square. I do not think the OCR is the right thing you are thinking of.

If two OCR'd PTOs fed into one drive shaft then only one PTO would be doing the work, the other (slower running PTO) would be over-run and thus not providing any power...

You will never be able to get the both turning at the same speed.



[Log in to Reply]  [No Email]
Janicholson

01-31-2008 07:18:21




Report to Moderator
 Re: need help on overrunning clutch! in reply to Jeff-oh, 01-31-2008 06:28:20  
With respect,I disagree, though at an idle, your construct is good, if the tractor PTOs were within a few RPM of each other this difference would disappear the moment a load was placed on the shaft. Both clutches would be driving and both engines powering with proportional throttle opening according to their governors. It might not be perfectly ballanced, but it would drive well from both. JimN

[Log in to Reply]  [No Email]
oldmax

01-31-2008 06:20:55




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
Sorry I didn't give you answer you wanted just the difference . The overide clutch is built like the starter clutch on a B/S small engine with a pull starter . But has rollers in the place of balls . will let tractor drive implement but not let implement drive tractor. Just like when you pull starter on small engine you can start with pull but engine will not turn starter .



[Log in to Reply]  [No Email]
oldmax

01-31-2008 06:10:41




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
A overide clutch & a slip clutch are two different "dogs" . An overide clutch keeps an attachment from powering the tractor, such as a brush hog "Used on 8N & tractors without Live power" . Being that the PTO is hooked to trans gears directly with no clutch between PTO & wheels .

A slip clutch is just that , Will slip before damaging something else .



[Log in to Reply]  [No Email]
John N Mi

01-31-2008 05:53:33




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
I also am interested in this subject as the three point rotary tiller that I just bought has one. My booklet says that the clutch can slip if the tiller is jammed. What is not clear is wether the clutch goes next to the tractor or next to the tiller. I think next to the tiller. Is this right?
John



[Log in to Reply]  [No Email]
NEsota

01-31-2008 05:43:57




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  
With an over riding clutch on your PTO output shaft, the input shaft to the implement will be engaged (locked to the PTO) unless the second shaft is trying to turn faster than the PTO shaft. If the second shaft is turning faster than the PTO then the dogs in the clutch are disconnected. If the implement is, like a bush hog and has a flywheel effect, then you need the clutch but if it is one like a sickle mower that has little flywheel effect, then you do not need it. The clutch is a safety device, if it is needed do not leave home without it.

[Log in to Reply]  [No Email]
Billpa

01-31-2008 05:27:40




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 04:41:43  

could you shed more light on the subject ,more info is needed.



[Log in to Reply]  [No Email]
ironpony

01-31-2008 08:00:22




Report to Moderator
 Re: need help on overrunning clutch! in reply to Billpa, 01-31-2008 05:27:40  
hi this is for my saw mill. my power unit lacks enough horsepower to saw the bigger logs. the power unit is hooked to the main shaft by roller chain and i can back one of my tractors up to the end of the shaft and hook up to provide the needed horsepower and that's were I was going to put the orc. the powerunit would do most the work and the tractor pick up the slack . hope this helps.



[Log in to Reply]  [No Email]
badpenny

01-31-2008 09:08:10




Report to Moderator
 Re: need help on overrunning clutch! in reply to ironpony, 01-31-2008 08:00:22  
Maybe removing some teeth from the blade would help, fewer teeth = less power to turn



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy