TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

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

Tractor Talk Discussion Forum

Tractor H,P./ torque

Welcome Guest, Log in or Register

Author

SDE

11-17-2007 18:35:58

Report to Moderator

My brother's tiller is rated for up to 45 hp. My 400 will exceed that by a few. The rated torque in the owners manual is 472 lbs. Does anyone know how to figure out the torque delivered at the PTO. I do not want to shear a shaft again.

It is a 6 foot New Holland 105A. At 540 PTO RPMs the tines are turning 210 RPMs.

I intend to keep the tractor at a lower engine speed to not overpower the little bugger.

Also, I reversed the right wheel, so that the tiller will cover the tire track. Will this cause a significant amount of traction loss when I plow snow this winter? I do have two weights on each wheel.

Thank you SDE

[Log in to Reply] [No Email]

Jerry/MT

11-18-2007 17:20:25

Report to Moderator

Re: Tractor H,P./ torque in reply to SDE, 11-17-2007 18:35:58

At constant horsepower, the product of torque x rpm = a constant i.e Tengine x Nengine = Tpto x Npto. this is an ideal relation shipt that assume no loss through the gears. So if the engine torque is 472lb-ft at 2000 rpm and the pto is running at 540 rpm when the engine is running at 2000 rpm then the pto torque is: T2 = T1 x Ne/Npto

472lb-ft x 2000/540 = 1748 lb-ft

If the gear train has an efficency of say 90 % than Tpto actual =efficiency x Tpto i =0.9 x 1748 = 1573 lb-ft.

[Log in to Reply] [No Email]

Midwest redneck

11-18-2007 05:54:29

Report to Moderator

Re: Tractor H,P./ torque in reply to SDE, 11-17-2007 18:35:58

Bob is right, also the torque at the rear wheels is multipled through gear reduction. So if you have 400ft lbs and the torque is multipled by 20 times the torque is 8000ft lbs, speed is reduced though.

[Log in to Reply] [No Email]

RAB

11-18-2007 00:12:08

Report to Moderator

Re: Tractor H,P./ torque in reply to SDE, 11-17-2007 18:35:58

Bob is right but you may well be over-torquing at lower speeds. The safety bolt should shear, of course, as well as the slip clutch option. Operate it at the manufacturer's recommended speed. Those ratings will be appliccable at those particular values. The shaft will be rated at that particular speed as well.
RAB

[Log in to Reply] [No Email]

Bob

11-17-2007 23:34:20

Report to Moderator

Re: Tractor H,P./ torque in reply to SDE, 11-17-2007 18:35:58

Doesn't the silly tiller have a safety slip clutch?

torque = HP X 5252 / RPM

For instance,

50HP x 5252 / 540 = 486.3 ft/lbs
45HP X 5252 / 540 = 437.7 ft/lbs

[Log in to Reply] [No Email]

SDE

11-18-2007 11:38:46

Report to Moderator

Re: Tractor H,P./ torque in reply to Bob, 11-17-2007 23:34:20

Yes it does, but it allowed us to shear a $650 shaft. I will make sure it is going to slip before I use it again.

It is recommended that at the beginning of each tillage season that the tension is reduced and the clutch allowed to slip for 1 to 2 seconds and then reset the spring tension to the proper setting. We learned the hard way.
SDE

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

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