6600 PTO shaft does not turn

nashranch

Well-known Member
I noticed yesterday that my PTO shaft does not turn at all. I havent got the tractor running yet. I tried with lever engaged and disengaged. This doesn't seem right but not sure. This tractor had been sitting out in the open quite a few years
 
I believe that the 6600 has the same system as the 5000 series. They are an independent PTO, with a hydraulic clutch pack, and a spring
activated brake to keep them from turning when the PTO is shut off.
 
Uhhh...if the engine is not running, then yes, the PTO shaft will not turn regardless of the position of the lever.

Now then, if what you really mean is that you can't turn the shaft by hand, then it's likely very normal with a 540 shaft. Any unusual rust build up on the PTO housing will drag the brake band and would likely
make it very difficult to turn. You should be able to turn it with a pipe wrench. That said, I wouldn't worry about it.
 
(quoted from post at 08:13:47 05/06/20) Uhhh...if the engine is not running, then yes, the PTO shaft will not turn regardless of the position of the lever.

Now then, if what you really mean is that you can't turn the shaft by hand, then it's likely very normal with a 540 shaft. Any unusual rust build up on the PTO housing will drag the brake band and would likely
make it very difficult to turn. You should be able to turn it with a pipe wrench. That said, I wouldn't worry about it.

Bern. It don't even turn with a 15" crescent wrench on it. I tried turning both directions with it engaged or disengaged. The rear end oil looks good and clean but i haven't checked to see if there is water that has settled to the bottom yet. There was about a 1/2 gallon in the engine pan
 
With the engine not running it makes no difference whether the handle is in the engaged or disengaged position. All that handle does is control a hydraulic valve that causes hydraulic fluid to be redirected to control both the clutch pack and the brake. With no hydraulic flow (because the engine is not running) the PTO defaults to "disengaged" which means that the clutch pack should be disengaged and the brake should be engaged, both by spring pressure. When the engine is running and the handle is in the engaged position the hydraulic pressure overcomes both springs and disengages the brake and engages the clutch pack. I don't know whether it should be able to be turned with a large enough wrench when the tractor is not running as Bern says, but I have no reason to disbelieve him, but you would be overcoming the brake by doing so and any rust build up as he pointed out already. I wouldn't try myself just because I wouldn't want to wear the brake band as they weren't all that robust to begin with.
 
Sean,

In a 6600, the PTO brake is hydraulically applied and spring released, meaning a person should be able to turn the shaft with the engine off.
A 540 shaft is tough to turn with a bare hand even under ideal circumstances because of the gear reduction ratio, however it should easily
turn with a short pipe wrench.

A 5000 on the other hand is opposite. The brake is spring applied, and a person should NOT be able to turn the shaft by hand with the engine
off.
 
You either have some serious rust going on inside of there, or some prior mechanical damage, like an exploded clutch pack, if you can't turn
it with a wrench.
 
(quoted from post at 15:54:56 05/06/20) Sean,

In a 6600, the PTO brake is hydraulically applied and spring released, meaning a person should be able to turn the shaft with the engine off.
A 540 shaft is tough to turn with a bare hand even under ideal circumstances because of the gear reduction ratio, however it should easily
turn with a short pipe wrench.

A 5000 on the other hand is opposite. The brake is spring applied, and a person should NOT be able to turn the shaft by hand with the engine
off.

My bad. I assumed they were like the 5000 & 3 cylinder 4000.
 
(quoted from post at 12:56:32 05/06/20) You either have some serious rust going on inside of there, or some prior mechanical damage, like an exploded clutch pack, if you can't turn
it with a wrench.

Oh great.. Probably why the tractor was parked years ago. Of course the PO didn't mention that. Glad i got it so cheap.
 

They changed the 5000 from spring applied pawl brake to hydraulic applied band brake in 72 or 73, control valve has a 72 part number, 6600 used the same band brake setup. when the engine is running the pto is engaged or stopped by the brake, when the engine isn't running you can turn the pto to line up a implement shaft, I can turn mine by hand but it's not easy.
4000 series keep the pawl brake to the end of 4630 production, but it was also hydraulically applied beginning with the 4600 model and could be turned by hand with the engine stopped.
 

Thanks for all the info fellas

Yep there was water in the tranny and the rear axle.

What's my next step in fixing the stuck PTO shaft??
 
(quoted from post at 21:00:06 05/06/20) I think if I were you I'd focus on getting it running first.
yep I plan on doing that Bern as soon as I get parts. In the meantime I'm just checking out other posts of the tractor. I just had the tractor split to do the clutch, throw out bearing and pilot bearing. I was able to turn the pto shaft along with the tranny spline so it was all good there. The 3 point arms did raise up good when I was cranking engine over with starter.
 
Unfortunately there's not much to see from the cover in the back. Best way to access the PTO clutch is by removing the 3-point lift cover.
This assumes that the tractor does not have Load Monitor, which most 6600s did not.
 

Thanks Bern.. I will be doing that one of these days. That is a big monster unit.. biggest one I've ever removed. Looking forward to see what's inside.. anybody have any pics??
 
mvphoto54404.jpg
 
Yep, that's it. I'd be willing to bet that dozens of those tubes have been busted off over the years.

Also, don't forget the 1/2" bolt directly underneath the RH lift arm. More than one center housing has been busted because that one gets
overlooked. It's likely buried under years worth of crud.
 
(quoted from post at 22:28:58 05/07/20) Yep, that's it. I'd be willing to bet that dozens of those tubes have been busted off over the years.

Also, don't forget the 1/2" bolt directly underneath the RH lift arm. More than one center housing has been busted because that one gets
overlooked. It's likely buried under years worth of crud.

de ja vue...
 
(quoted from post at 20:28:58 05/07/20) Yep, that's it. I'd be willing to bet that dozens of those tubes have been busted off over the years.

Also, don't forget the 1/2" bolt directly underneath the RH lift arm. More than one center housing has been busted because that one gets
overlooked. It's likely buried under years worth of crud.

You're right Bern... encrusted in crud

mvphoto54486.jpg
 
Remove all of the perimeter bolts on the cover and lift straight off. Suggest making a bracket with two holes in it and mounting it where the
seat bolts on for a lifting point.

Don't try and lift that cover off by hand unless you want to end up in the hospital.
 

Good plan Bern. I'll either use my come a long to the rafters or my 2 ton cherry picker. I also have this IH with loader or my little Kubota Bx-24 with a loader.
 

So I got my partial order from YT yesterday... no head gasket kit so I can't put engine back together. Also the pre cleaner bowl i ordered is way to small for my pre cleaner setup. The one I ordered is only 7 1/4 diameter. Mine is 9 1/2 at the bottom and 10 1/2" at the top.. where can I get the right one??

mvphoto54539.jpg


mvphoto54540.jpg
 
(quoted from post at 19:28:24 05/08/20) Remove all of the perimeter bolts on the cover and lift straight off. Suggest making a bracket with two holes in it and mounting it where the
seat bolts on for a lifting point.

Don't try and lift that cover off by hand unless you want to end up in the hospital.

Bracket made Bern and lifted off the 3 point housing smoothly. Found slightly rusted PTO brake band, was easy to free up. Will clean rust a bit more and clean sludge from bottom of sump. Should be good to go


mvphoto54566.jpg


mvphoto54567.jpg
 
That's just the little bit of sludge that was left in the bottom of the sump. I have washed out the sump with a pressure sprayer full of diesel, then sucked it out with and old shop vac. My method works quite well. The PTO clutch turns real freely, was just surface rust on the housing. Think I'll make a new gasket and slap it back together




mvphoto54569.jpg


mvphoto54570.jpg
 
Suit yourself. If it were me, I'd pull the whole thing out and inspect the clutch plates, etc. for wear. I could have the whole assembly out on the bench and disassembled in 5 minutes.
 

Ok you talked me into it.. I bet that shaft pulls out the back they that access plate. It does look pretty simple
 
(quoted from post at 17:40:01 05/09/20)
Ok you talked me into it.. I bet that shaft pulls out the back they that access plate. It does look pretty simple
They look good Bern

mvphoto54572.jpg
 

Head gasket set you need is HS4940
The air cleaner bowl is Ford part # 277377R1 used on 7000/7600 models.
YT lists having that bowl for IH 1206, should be the same one
 

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