(800) 853-2651
SHOP NOW

H PTO Speed Indicator

D

Doug Kieta

Member
Just finished adding an aftermarket 3-pt to my 51H and mounting a Bush Hog shredder. Now, how to determine PTO RPM. Has anyone figured out a good way to do this so that the shredder runs at its optimum speed. Seems to me that the best I am going to be able to do is learn to listen to the engine as I get the shredding results I want, and then mark the throttle position on the throttle housing.
 
(quoted from post at 17:59:55 05/20/19) Just finished adding an aftermarket 3-pt to my 51H and mounting a Bush Hog shredder. Now, how to determine PTO RPM. Has anyone figured out a good way to do this so that the shredder runs at its optimum speed. Seems to me that the best I am going to be able to do is learn to listen to the engine as I get the shredding results I want, and then mark the throttle position on the throttle housing.
Click to expand...
You can buy a hand held tachometer for under $20 on the internet. What you will probably find is the 540 at the pto is around 90% throttle.
 
Get a hand held tachometer and hold on end of PTO shaft. Pull throttle wide open with no load and set governor if needed so it turns 594 to 600 RPM. If governor is set to original it should turn around 540 when under load and full throttle.
 
Another way is to stick a handheld tach/dwell meter on the engine. Now run the engine and when the tach shows 1,650 RPM the PTO will be turning at 540 RPM (the crankshaft to PTO gear ratio is 3.05:1)

Incidentally my experience with shredders is they work best right around design RPM (540 RPM on the PTO shaft)
 
I have always used the WOT option as below. WOT stands for wide open throttle. The 540 speed is what tractor manufacturers used to describe the greatest HP and torque "with the throttle wide open". Machines were not made to check the rpm, nor will they care at all. Do not run one at twice speed, but 5% to 10% over is no issue. Trouble comes from 1000 rpm shafts on 540 machines, or a transmission driven unit and a speed overdrive transmission like a M@W 9 speed on a Farmall or Sherman on a Ford. Jim
 
You're over thinking it. Just pull it wide open.Dont worry. Hs have been run wide open on the PTO since 1939 with no disasterous results.
 
Most have suggested running at WOT which is fine but betting you won't like it. That tractor and shredder will be screaming. I find that my M at 3/4 throttle will do a fine job. I don't see any reason to push these old tractors if they'll do a good job at lower RPM's.
 
You could use one of these, it's a revolution counter. If the governor is adjusted right anything from 3/4 to WOT would be fine.
cvphoto23900.jpg
 
Running a PTO attachment under speed is much harder on them than 10% over. The tractor engine might be OK, but the implement will not be at its designed speed at 3/4 throttle. The result is insufficient inertia in flywheels and components that normally provide the force/energy to get the job done. Screaming at 1600 rpm is not dangerous, it is normal. If your equipment has bad bearings, or the tractor is running poorly, they need to be repaired. I have seen a farmer consistently shear pins in a baler drive when they Idled down for heavy windrows. WOT and stopping ahead of the heavy windrow to downshift was his fix. Jim
 
You must log in or register to reply here.

Similar threads

M
International 340 Utility PTO Issue
Replies
10
Views
347
militiaman11
M
H
245 PTO speed
Replies
3
Views
380
495man
495man
D
1950 Farmall H Hydraulics
2
Replies
25
Views
2K
Dave41A
D
D
460 pto ?'s
Replies
11
Views
2K
dwragon
D
V
new owner of a 620, will try to update this as we go.
2 3 4
Replies
61
Views
3K
valiant8086
V
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.

Copyright © 1997-2024 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

Back
Top