1105 PTO problem

Noblefarm43

New User
My family has had an 1155 for more than 30 years and it's always been a good tractor. Last fall I found an 1105 that was in decent shape for the price. Shortly after I got it I realized it was going to need a clutch job. No big deal, buy the parts put them in, new disc, TO bearing, reman pressure plate, put it back together and now the problem. As soon as the tractor starts the pto turns whether there is a load on it or not. This isn't the Massey pto issue where it turns with no load once the oil pressure builds up. And moving the lever on the side of the transmission does not disengage the pto. When the tractor is off the pto shaft can not be spun by hand like it can on the 1155. The tractor is currently split apart again and when you spin the pto the shaft that goes into the flywheel turns, if you hold that shaft then you can not turn the pto regardless of where the pto disengage lever on the side of the tractor is. I'm guessing something got compressed or shifted, either the clutch pack or the two shafts inside that sliding coupler? I'm going to take the top cover off under the cab floor boards off next and see what I can see but any advice would be greatly appreciated.
 
So I got the top cover off and the picture shows what I saw inside. The left side is towards the front of the tractor and shows the clutch pack and the right side is the sliding coupler. After reading the service manual several times I believe the middle shaft is the intermediate pto shaft. If my understanding of the manual is correct, this is only suppose to stick out of the clutch pack a little bit and be held in place with a snap ring. Not the several inches mine is sticking through. My only guess is something went wrong when doing the clutch job. Now I have to see if the shaft can be slid back in without pulling the pto assembly out of the back of the tractor.
 
Here is the photo
a231367.jpg
 
That does not look like you are at the pto clutch. It looks like you took the cover off of the transmission. The pto clutch is under the charge pump which is under the cover right infront of the lift cover. When you take the cover off the pump comes with it. The pto clutch is right there. The pto shafts cannot be seen. You need to pull the rear cover off to get to the shaft with the snap ring.
 
This is under the charge pump, the big piece on the right is the sliding coupler, and the left is the PTO clutch pack. The seat is still in the tractor so it's hard to look straight down at this point so I was holding my phone inside the housing with a light pointing in it.

Reading the manual, there is suppose to be a .010 to .026 inch gap between the middle and rear PTO shafts. My guess at this point is that the snap right that is suppose to lock the middle shaft into the PTO clutch has broken and the two shafts are currently touching. My next step is probably going to be to take the seat out so I can look straight down into the housing and see if I can tell exactly how the shafts have moved.
 
That shim pack is needed to keep the PTO clutch drum assembly from sliding reward, so the rear oil seal ring stays in the bore. Had a 1105 years ago that burned the plates. Got it fixed but forgot to check the shaft shim back end play. Checked the PTO on the dyno, and it slipped at 80 HP. Put the pressure gauge on the PTO circuit, pressure started out OK but then dropped 100 PSI when the load was on. Pulled the charge cover again and found there were not enough shims on the rear shaft, and the clutch pack was moving reward under load, allowing the rear seal ring to come out of the bore far enough for the pressure loss. Pulled the rear gearbox again, added the shims needed, and no more trouble. It was never shimmed right since new.
 
So here is an update on the PTO situation. The intermediate shaft that drives the clutch pack and the rear shaft that drives the PTO unit have fused together. They are welded, joined, mated in metalurgical matrimony, chose your description. When you try and pull the back shaft out the middle one slides with it until the middle one hits the sliding coupler.

I've tried putting a cold chisel down in and pounding on it but there isn't much room to swing a hammer down under the cab. The only idea I have now is to try and start cutting them apart with a small hack saw and once I have a groove started hopefully I could get in there with a long blade on a sawzall.

I have absolutely no idea how this could have happened, the PTO worked fine during the winter but since doing the clutch job and servicing the tractor we really managed to screw something up.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top