8N PTO troubles

[redspud]

I"ve found a lot of knowledge in these forums and I"m hoping I can get more help with an issue I am having. The machine is a 48 8N and I elected to acquire a conversion PTO shaft to cure the adapter issue and correct some leaking seals. The conversion shaft went in fine, or so I thought. When I tried the shaft after the installation, I found that the PTO output shaft continued to spin, even with the lever in the disengaged position. No matter if the lever is in the engaged or disengaged position, the shaft spins. It stops, as it should, when I depress the clutch. Thinking that I had messed something up and out of any other ideas, I reinstalled the original shaft and it worked fine. Once again I took the old shaft out and put the new one back in. Same thing, it spins all the time. What could possibly be going on here? I aso bought an over-running coupler that will not go far enough onto the shaft to allow the spring pin to go through. Has anyone else experienced either of these problems and what was done to correct them? I made my purchases from Davis Tractor and I wrote to them for help for these issues, but I haven"t heard back from them. Please offer any help, tips or experiences that anyone may have. Thank You, redspud

 

[HCooke]

" it spins all the time."

Try it with an implement such as a mower attached and see what happens. Report back. If it does not spin with an implement all is well. Whatever you do, do not test it with your hand.

 

[mhb@ufe]

It sounds like the shaft is not assembled properly so it is too long inside and too short outside.

Mark

 

[gwstang]

disregard, I missed the part where you put the old one back in and it worked ok.

 

[souNdguy]

mhb got it maybee.

someone here a while back had a similar problem. i believe they stuck another gasket upder the flange as a test.

got any gasket paper or thin cardbaord.

make a test 'shim' gasket with your gasket as a template.

 

[JoePilot]

I can't say much about the spinning, but I too bought an ORC that wouldn't go on far enough. Ended up using a bench grinder to remove some material from the ORC base so it would fit.

As to the spinning, it may be that the response about too much on the inside and not enough on the outside is correct. Make some careful measurements of both shafts. Overall length the same? Length aft of the bearing/seal housing? I can't remember, but it may be bearing or sleeve was installed wrong.

Good luck.

Joe

 

[redspud]

Thanks for all the input. Today I heard back from Davis Tractor Parts and was told that the hole through the shaft to accomodate the spring pin for the ORC should be 5/8" from the end of the shaft to the center of the hole. Well, mine measures 1 1/8", which would explain why I can"t get the pin through. My next step is to remove the original shaft again and measure to compare to the new one. Don"t worry HCooke I will not try to stop the spinning shaft with my hands, I know too many farmers with only one hand or one arm.

Again, thank you for all the ideas and suggestions. If anyone has any other ideas, I would certainly appreciate them.

I will report on my progress, or lack of it, as this project continues.

As I told the folks at Davis, the only thing missing from this circus is the monkeys. This simple job that I should have been able to do before my coffee got cold has turned into a real adventure

I will also hook up a mower to see if the shaft continues to spin with a load.

 

[mhb@ufe]

While sliding the new shaft in you should be able to spin the shaft by hand all the way in. If you feel it engaging the splines with the PTO lever in the off position it is too long.

Mark

 

[gatchelguy]

Flathead Ford tractors have a splined adapter bolted to the rear end of the countershaft. Your new shaft may be too long and is butted up against this bolt. Or maybe the bolt has backed out causing the same effect.