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1951 8N PTO shaft?

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Keith Calhoun

03-05-2001 12:57:30

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I am trying to remove the PTO shaft from my 8N. I removed the four bearing retainer bolts from the rear and it only slides out about a inch and a half and then hangs up on something. With the lift cover removed, it looks to me like it might be hanging up on the cams at the pump... hard to tell though. I don't know if it is a bur or a slight twist that is not allowing it to pass through the pump. Any suggestions for removing the PTO are greatly appreciated. Thanks, Keith

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Don CO

03-05-2001 18:21:47

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Re: 1951 8N PTO shaft? in reply to Keith Calhoun, 03-05-2001 12:57:30

Hold on!! Don't cut nothin' yet. Had this same problem with mine last year & called the local expert mechanic. He got it off in about 5 minutes. Lemme call him & see what magic he used. Back later.

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Don CO

03-05-2001 19:15:17

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Re: Re: 1951 8N PTO shaft? in reply to Don CO, 03-05-2001 18:21:47

OOPS. Put my foot in it that time. He replaced the seal by driving the new one in & pulled the old one out with a needle-nose. Sorry :-(

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ZANE

03-05-2001 17:49:47

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Re: 1951 8N PTO shaft? in reply to Keith Calhoun, 03-05-2001 12:57:30

The PTO shaft is probably twisted and the only way to get it out is to cut the shaft off in front of and behind the pump and then drop the pump our and grind the end of the shaft stub in the pump and it will come out.

A nasty no good dirty rotten shameful job, but it has to be done!!

I use a cutting torch. I don't have a blade in my saws all that would cut that hard shaft.

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Dell (WA)

03-05-2001 15:48:24

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Re: 1951 8N PTO shaft? in reply to Keith Calhoun, 03-05-2001 12:57:30

Keith..... ..someone a while back reported "success" in removing his "twisted" PTO shaft with a "saws-all" and metal cutting blade. Figgered that was better and safer than waving a cutting torch around. I think he dropped his hydraulic pump to get to it. Said it didn't take too long to do it.

One of the reasons to use an "Over Running Coupler" (ORC) when brushoggin'..... .....Dell, the self-appointed ORC safety preacher

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Brent

03-06-2001 05:41:12

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Re: Re: 1951 8N PTO shaft? in reply to Dell (WA), 03-05-2001 15:48:24

Dell, how does using an ORC prevent twisting of the PTO? Does the ORC also shear when something hard is hit? I don't think mine will. My ORC lets the blades spin when the motor stops, but it does not let the motor spin when the blades stop. I presume the latter is what leads to bent PTO's. An ORC with a shear pin might be a good thing though, but I don't know of any.
Brent

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Dell (WA)

03-06-2001 10:39:52

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Re: Re: Re: 1951 8N PTO shaft? in reply to Brent, 03-06-2001 05:41:12

Brent..... .the ORC is a ratchetting device that allows engery to transfer from the tractors PTO shaft because the brushog blades consume energy by cutting. When you clutch, you nolonger are providing energy thru the tranny and PTO so all that rotary inertial energy (even tho it is being consummed by the blades) is now at a faster RPM than the PTO. The 1-way ratchet starts bypassing all that brushog rpms and therefore does not transfer any of that brushog energy back into the PTO shaft and into the tranny which would otherwize drive back out thru the rearwheels.

This is a completely different effect than a sheerpin..... ...Dell

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Brent

03-06-2001 10:44:23

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Re: Re: Re: Re: 1951 8N PTO shaft? in reply to Dell (WA), 03-06-2001 10:39:52

Dell, this I understand, but don't most twisted PTO shafts happen because the engine is pushing hard when the blade suddenly stops on a stump or similar? I've not bent a shaft (yet), so maybe I've got this wrong. But unless it's otherwise, an ORC won't help prevent a twisted PTO shaft. Brent

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Nick Fischer

03-06-2001 17:15:49

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Re: Re: Re: Re: Re: 1951 8N PTO shaft? in reply to Brent, 03-06-2001 10:44:23

At least on our bushog, their is a clutch on the pto shaft from the bushog that slips when u hit something. This is to protect the tractor.

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Brent

03-06-2001 05:40:40

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Re: Re: 1951 8N PTO shaft? in reply to Dell (WA), 03-05-2001 15:48:24

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dave#1

03-05-2001 16:01:30

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Re: Re: 1951 8N PTO shaft? in reply to Dell (WA), 03-05-2001 15:48:24

I kind'a remember that discussion, but I don't think it was the pump he removed (Being ya got's to remove the pto shaft in order to drop the pump)

I'll check the archives and see if I can find it.

later,dave

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Tyler (MD)

03-05-2001 13:19:17

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Re: 1951 8N PTO shaft? in reply to Keith Calhoun, 03-05-2001 12:57:30

Here's some info:

Click here

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