PTO won't engage, rebuilding info needed

OK, Let's see if I can make this simple. I have a 47 farmall H 24XXX serial. I started the PTO in the past to see if it spun and I assumed that because it did that there was no problem with it. Well, I attached a brush hog to it and it would just go "bang bang bang bang" and you could see the activating lever pulsate with the noise. It attempted to spin, but it barely rotated. Obviously the shaft wasn't engaging the transmission properly. I removed the shaft, and I have a few guesses as to what the problem is, but again it would be only a guess. I took the brush hog off, and it banged a time or two then engaged fine. Put it back on, same result. In other words, it won't engage under load. I am thinking that this giant spring on it doesn't have any mustard left and won't push the rod into the back of the trans when lever is activated. I have attached pictures. Any help appreciated.

Also, any suggestions as far as what other parts I should replace since I got the thing yanked outta the tractor. I want to replace the odd dimensioned PTO shaft with the standard modern 6 spline one so I don't have to use that stupid adapter. Do they make one? How bout part sources for the H? Yesterdays tractors doesn't seem to have much of any PTO parts.

Thanks,

Dan in Pennsylvania

http://dangaus.com/farmallh/shaft1.jpg
http://dangaus.com/farmallh/shaft2.jpg
http://dangaus.com/farmallh/shaft3.jpg
http://dangaus.com/farmallh/shaft4.jpg
http://dangaus.com/farmallh/shaft5.jpg
http://dangaus.com/farmallh/shaft6.jpg

shaft2.jpg

If that is an H between 1942 and 53/4
It has a standard spline on the shaft! Though I do not know what spline you have on the Implement, I know that only the very earliest had a different spline.
The engagement dogs look pretty good to me, If the dogs in the trans are toast it would jump out of gear.
I do not know, and am not insulting you!!!, but this is not a clutch type PTO. The tractor needs to be stopped, the clutch pedal needs to be held down until it stops turning, then the lever is pulled up to engage the dogs. As the tractor is then put in gear, and the clutch let out, the "mower" or what ever starts to turn with the tractors motion. It will not work any other way!!
The safest way to use a non-;ive PTO is with a over-running clutch (one way adapter in the PTO shaft. (it is placed where your adapter is now)
This device (from a farm or tractor store) prevents the mower from driving the tractor through the gears in the trans. (allows the tractor to stop while the inertia of the mower continues to spin the blades) Many a new operator, and old as well, have been pushed into fences and barns from the mower flywheel effect.
Good luck, and do use a over-running clutch. JimN

Have you looked at the mower drive-shaft to see if there might be something --a slip-clutch or u-joint that is worn, that is causing the noise? I hope that it isn't a worn gear in the mower gear-box that is causing the problem. Like Jim says, the dogs look good on the PTO shaft driveshaft. Only other thing might be trouble ahead of the pictured driveshaft [wear in the mating dogs].

By dogs you mean the two lugs on the shaft? You can't see it in the pictures, but there's a chunk taken out of one of them. Also, the spring that is part of it is pretty looose. I can compress it with my hand. Would that cause my symptoms?

No one has had this experience before? I"m having problems finding parts too.....this rots!

Everything in the pics looks good. If there are chunks out of the mating dogs, that is probably what is causing the problem. Probably hard to get pics of the dogs up in the tractor--are the chunks out of the dogs on the "driving" side I would guess? If so, it's not going to be easy.

The spring is pretty wimpy and has always been that way, they do not fail often. If the dogs on the trans are worn it will jump out of PTO. The solution is to replace the drive dogs (trans top and teardown of trans components (I think) JimN

You have the original style PTO. It was replaced for a short time with a second design and then quickly changed again to the standard 1 3/8 shaft will a spline type engagement on the transmission countershaft. The spring is there so you can engage the PTO even if the dogs are not lined up. As you start to release the clutch the spring will push the dogs into the slot on the countershaft.

You can weld up the dogs to get a good square surface again and it may work for you for a while. My dad used to do that once or twice a year since that was the tractor he liked to use to run the corn picker.

For a more permanent repair you are going to have to remove the transmission countershaft and repair the worn end. Unless you really want to keep it original you are much better off replacing the countershaft with the later style and using the newer PTO shaft. If you do change to the 1 3/8 shaft you should also change the swinging draw bar since it was made longer to keep the correct distance for the longer shaft.

It's true, part 18A, on the parts diagram, TRANSMISSION COUNTERSHAFT ADAPTER WITH BUSHING, 43328D (D) part #59372DX is shot!

The dogs on the shaft have chunks out of it, but the adapter looks like it went thru a grinder. Would I be better off upgrading to a newer shaft assembly? I have been unsuccessful in trying to find a replacement for it. The part is "retired" and is only available used.