2006 M6040 PTO Gasket keeps backing out

[Bucktrot]

The gasket that seals off my tractor's hydraulic/transmission fluid where my PTO is located (gasket is round metal & plastic) and goes over the PTO and has to be delicately tapped into place tightly) keeps coming out!!! The gasket seats properly and keeps the fluid from coming out, but with use, it comes or backs out. Even with JB Weld on outside of baseplate and outer part of gasket, the gasket backs out and I loose approx 8 gals of hydraulic fluid. My PTO shaft is not loose, It doesn't wobble (at least not to the necked eye and if it does have a wobble, it's VERY little... if any at all).

My tractor has over 2000 hrs of hard hunting club hrs (not the same as a vacation type farm tractor) and I've used my tractor and Woods Rotary Cutter to do some nasty bushhogging. Could the baseplate where the gasket is placed be worn? The design of this gasket is to be placed over the PTO shaft and held in place by friction only it appears. Is there some kind of locking mechanism that should lock it in?!?!? It's a tight seal. HOWEVER, after bushhogging, the gasket still comes or backs out even when held in place with JB Weld. And no, my hydraulic fluid isn't too filled (above capacity) and causing pressure to build. But a good guess.

It's just now starting doing this. Now, it's got some hard hrs on it using the PTO and hvy duty Woods Brushhog 720 (it's been a great rotary cutter, BTW!).

Anyway, I am at a loss in figuring out what to do about my PTO gasket backing out! Thanks!!!

 

[North Idaho Wolfman]

First, please quit calling it a gasket, it a SEAL.

If the vent is plugged it wouldn't matter what the oil level is, low or high it can and will build pressure.

The seal might need a retaining compound (like thread locker) on the drive face, Loctite 620
If mating the surface is not oil free it will not hold.

Also if it has a bad bearing or other parts that are letting the shaft run out, it will just keep popping the seal.

 

[JimmyJazz]

First, please quit calling it a gasket, it a SEAL.

If the vent is plugged it wouldn't matter what the oil level is, low or high it can and will build pressure.

The seal might need a retaining compound (like thread locker) on the drive face, Loctite 620
If mating the surface is not oil free it will not hold.

Also if it has a bad bearing or other parts that are letting the shaft run out, it will just keep popping the seal.

A rather mean spirited response to a fellow brother in Orange.

 

[jaxs]

Pressure build up as Wolf mentioned would be the first thing to check. Another suspect is pto shaft between tractor and cutter binding instead of smoothly collapsing and extending as cutter oscillates up and down going over humps and bumps. As you can imagine that would yank tractor shaft effectively "tapping" seal in opposite direction of installation. If shaft slides smooth, separate shaft then jerk front half while attached to tractor same as you would slam a slide hammer seal remover.

 

[North Idaho Wolfman]

A rather mean spirited response to a fellow brother in Orange.

It's not meant to be mean.
If you don't call parts by the right name, it really confuses the snot out everyone trying to help.

 

[Bucktrot]

First, please quit calling it a gasket, it a SEAL.

If the vent is plugged it wouldn't matter what the oil level is, low or high it can and will build pressure.

The seal might need a retaining compound (like thread locker) on the drive face, Loctite 620
If mating the surface is not oil free it will not hold.

Also if it has a bad bearing or other parts that are letting the shaft run out, it will just keep popping the seal.

Vent? Where would the vent be?? Maybe it’s clogged?

 

[Bucktrot]

It's not meant to be mean.
If you don't call parts by the right name, it really confuses the snot out everyone trying to help.

I didn’t mind. It needs to be called what it is! Oh well… my fault!!

 

[North Idaho Wolfman]

They did a good job of hiding the vent.
It's under the seat base.

There is a second line that goes to the back hole of two vent holes in the case, it goes back to the three point lift cylinders.

 

[Bucktrot]

I went back and edited and changed the word gasket to seal, but for some reason, obviously, it did not take.

Just thinking…. If Pressure is building up enough to push out the PTO seal, while my tractor is running and has been running enough to increase pressure, shouldn’t I feel some type of pressure release when I remove my dipstick? It would make sense that I would get sprayed by mist or I would at least hear the pressure equalizing upon removing my dipstick. I would think it would take a lot of pressure to push out a PTO seal that is held in place with a comparable amount of JB Weld.

 

[Bucktrot]

A rather mean spirited response to a fellow brother in Orange.

Now let me school you a little bit on physics. It does matter the level of the hydraulic fluid in a contained space. Air, compresses; liquids do not. If the contained space of the casing or where the hydraulic fluid is, is completely filled with hydraulic fluid, then there would be zero room for the hydraulic fluid to expand, and there would be immediate pressure within the casing. When you have air present, there will be a given amount of flexibility for air compression. Where there is no air and only liquid, the pressure will manifest itself immediately.

 

[jaxs]

A rather mean spirited response to a fellow brother in Orange.

Now let me school you a little bit on physics. It does matter the level of the hydraulic fluid in a contained space. Air, compresses; liquids do not. If the contained space of the casing or where the hydraulic fluid is, is completely filled with hydraulic fluid, then there would be zero room for the hydraulic fluid to expand, and there would be immediate pressure within the casing. When you have air present, there will be a given amount of flexibility for air compression. Where there is no air and only liquid, the pressure will manifest itself immediately.

I joined this conversation and shared past experience that might explain reason seal won't stay in place but I'm always open to learning to. People don't all march to the same drummer so IMO it's important to understand and allow for various mindsets and reasoning while exchanging ideas. I have a fair handle on mindsets behind the mean spirited back and forth but I can't understand where the inference came from that Jimmyjazz needs to be schooled on physics. I don't intend to argue one way or the other but I really would like insight to what suggested Jimmyjazz doesn't understand why overfilling can effect pressure inside reservoir. Once again, I respect other's right to make their own conclusions and if they tell me how they come to those conclusions I often change my approach as a result.