Older H's PTO

ryanwheelock · Oct 12, 2009

Anyone ran into the problem with the PTOs on 1939-1940 H's, (I think 40 was the last year before they changed em). You can tell the older style from the newer H style. The older one is all flush model with only the shaft sticking out and the lever to turn it on. The newer H PTO has a squarish housing sticking out a couple of inches and then the shaft sticks out past that. Also the older style has a small diameter shaft. I've had the older PTO wear out on my 1940 H and I've tried welding and brazing the dogs, (teeth) a few times, (went to college for welding so think I did it right) and it still will slip with a load on the PTO. So I went and bought a used PTO shaft with good dogs and it still will slip with a load on PTO. Was wondering if anyone has came across the before and if the spot were the dogs meet up in the rear end is bad how hard is it to change??
In the process of gettin camera so can post a future pics.

rustyfarmall · Oct 12, 2009

There are several shims where the PTO bolts to the differential housing at the rear of the tractor. These shims are used to get the proper engagement of the pto shaft into the dog that drives it internally. You may need to remove some of those shims.

D Slater · Oct 12, 2009

Probably the slots in the counter shaft are worn to a taper.

RustyR · Oct 12, 2009

I had the same problem with my 40 H, I dedided to convert the system to the newer style drive which is much stronger as I still use the tractor. Changing the countershaft is the hard part, you will do major surgury on it before you find it in the bottom of the trans. I bought the rear section complete of a 48 & had everything I needed to do it. Works great now.

ryanwheelock · Oct 12, 2009

There is no shims

ryanwheelock · Oct 12, 2009

what parts did you change altogether? I didnt know they could inter change. Was planing on re building motor this winter and might tear into the rear end to fix pto. Just was wondering excatly what parts you got from the 48 and put in yours to fix the problem.
Thanks
Ryan

Owen Aaland · Oct 12, 2009

You need to replace the counter shaft and the PTO assembly. The later style uses a spline coupler rather than a dog coupler.

The dog clutch style was used fro S/N 501 - 45613. From S/N 45614 - 117999 the spline coupler was used but the output shaft was short like the one you have on your tractor. From S/N 117800 the longer style shaft assembly was used along with a longer swinging drawbar to maintain the correct end of shaft to center of hole dimension.

HSE · Oct 12, 2009

Thanks....I always wondered what the serial number breaks where for PTO's.

Older H's PTO

ryanwheelock

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rustyfarmall

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D Slater

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RustyR

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ryanwheelock

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ryanwheelock

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Owen Aaland

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HSE

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