D6R modulating valves repeatedly sticking

[Nige]

Opening up the filter now

This video shows you how. If you don’t squeeze the filter media in a vice you’ll never see the particles in the bottom of the pleats. Yes I know that it is an engine filter but the procedure is the same.

 

[Nige]

I really only need it to do a couple hundred hours so it can cover some payments and hopefully make enough that I can rebuild without sending myself into more debt.

To quote Clint Eastwood - “Do you feel lucky punk?”

I do sympathise with your situation and wish I could tell you to “just go ahead and run it, it’ll be fine”, but with the quantity of metal in those photos something inside that tranny is just about on the point of suffering a mechanical hernia and if it does then you’ll be going in there with a shovel to extract the broken parts and probably the only thing worth saving will be the case.

 

[ZacharyMartin]

To quote Clint Eastwood - “Do you feel lucky punk?”

I do sympathise with your situation and wish I could tell you to “just go ahead and run it, it’ll be fine”, but with the quantity of metal in those photos something inside that tranny is just about on the point of suffering a mechanical hernia and if it does then you’ll be going in there with a shovel to extract the broken parts and probably the only thing worth saving will be the case.

Im honestly surprised at the lack of material in the filter media, but if I were to assume the material was from a previous failure that had been fixed and someone didn’t do their due diligence with fluid contamination and changing the filter that the transmission could be okay even after having that ****** fluid pumped through it? The largest chunks were on my finger in the photos and the one with small material is after running my finger through half a dozen or the low spots on the media

 

[ZacharyMartin]

Im honestly surprised at the lack of material in the filter media, but if I were to assume the material was from a previous failure that had been fixed and someone didn’t do their due diligence with fluid contamination and changing the filter that the transmission could be okay even after having that ****** fluid pumped through it? The largest chunks were on my finger in the photos and the one with small material is after running my finger through half a dozen or the low spots on the media

It definitely emphasized how bad the fluid was and I’m assuming it’s all so dark due to friction material?

 

[Nige]

It definitely emphasized how bad the fluid was and I’m assuming it’s all so dark due to friction material?

Not necessarily. Usually oil goes dark because it burns as a result of clutch slippage, which you obviously have or had because it’s in the title of the thread regarding the modulating valve problems.

Maybe you could get away with this after all if (fingers crossed) someone didn’t do their due diligence in regards to cleaning after a previous failure.

Ho do you feel about pulling out the transmission pump for a look inside it and also the transmission cooler.? Those are the two components that usually nobody wants to pull after a transmission failure yet they can adversely affect the operation of the rebuilt tranny if they are not up to snuff. Usually you find the cooler full of clutch material “sludge”.

 

[ZacharyMartin]

Not necessarily. Usually oil goes dark because it burns as a result of clutch slippage, which you obviously have or had because it’s in the title of the thread regarding the modulating valve problems.

Maybe you could get away with this after all if (fingers crossed) someone didn’t do their due diligence in regards to cleaning after a previous failure.

Ho do you feel about pulling out the transmission pump for a look inside it and also the transmission cooler.? Those are the two components that usually nobody wants to pull after a transmission failure yet they can adversely affect the operation of the rebuilt tranny if they are not up to snuff. Usually you find the cooler full of clutch material “sludge”.

As far as I’m concerned my labour is free, and a new transmission sure isn’t. Knowing the previous owner I’m 90% sure they wouldn’t have put in the effort to remove, flush or even check the cooler or pump. Still curious what I’ll find in the screens. Pulled apart another section of media directly under the damaged part of the filter with similar results

 

[Nige]

Still curious what I’ll find in the screens.

I suggest that should be your next step before doing anything else.

 

[ZacharyMartin]

I suggest that should be your next step before doing anything else.

Yeah seems like a good idea, I believe the powertrain cooler is on the passenger side of the engine, is the pump for the transmission mounted on the torque converter housing?

 

[Nige]

is the pump for the transmission mounted on the torque converter housing?

It is.

 

[ZacharyMartin]

It is.

Is there any benefit to removing the cooler? I’ve been searching through the cat diagrams and it looks like the oil flows around the tubes the coolant flows through, should I just pull the lines and rig a way to pump through the cooler to flush everything out? Or can it be torn apart to where I can actually clean the inside of it? Thanks

 

[Nige]

Unfortunately you can’t clean the passages around the tube bundle inside the cooler without removing the cooler core from the machine. You’ll see what I mean when you actually get it out.

 

[ZacharyMartin]

Unfortunately you can’t clean the passages around the tube bundle inside the cooler without removing the cooler core from the machine. You’ll see what I mean when you actually get it out.

Well I put about 2.5 hrs on the dozer with the new transmission filter in, didn't have any Modulating valves get stuck which was a nice change. But I did have a new issue which might explain some things. I ran it for a little over an hour and noticed a funny sound happening as a I braked and put it in reverse after pushing up a very steep hill, I got out to just put eyes on everything and it was making an odd clunking noise over and over as if something was trying to engage while it was sitting parked. There was steam or smoke coming off the frame around the final drives and it was so hot around them I couldn't put my hand on it. I'm assuming that would be the steering clutches behind the final drives. I did notice it didn't quite steer as well as it did when I had starting but I really don't have much seat time and the steering joystick has a quite a bit of slop so I'm sure it isn't getting maximum input. Are there clutches that steer it that also get fluid from the transmission? I'm assuming if there is they were slipping causing a fuckload of heat and could be whats filling the transmission fluid with friction material.

 

[Nige]

Your tractor is differential steer. There are no steering clutches.

 

[ZacharyMartin]

I also found out that apparently after the torque converter failure the powertrain cooler was replaced, and the pump was removed and cleaned. I'm currently posting the videos with the sound to youtube so you can hear it.

 

[ZacharyMartin]

Your tractor is differential steer. There are no steering clutches.

what would cause heat buildup like that? I was working it pretty hard but I'm assuming it was way more heat that normal.

 

[Nige]

Key word “apparently”. If you weren’t there when it was done take any information with a pinch of salt and confirm for yourself. YMMV.

 

[Nige]

what would cause heat buildup like that?

Brakes not fully releasing possibly.? They are spring applied and released by oil pressure, the oil in question being supplied from the transmission pump. Note my earlier recommendation about confirming work that was “apparently” done by others.

What did the transmission temperature gauge show.? Does it even work.?

 

[ZacharyMartin]

Key word “apparently”. If you weren’t there when it was done take any information with a pinch of salt and confirm for yourself. YMMV.

Yeah I've got the gaskets ordered to remove the cooler and verify, I got a little worried thinking the steering had clutches and I was gonna contaminate the fluid with it, could it be that the brakes are dragging ever so slightly and causing a heat buildup? There must be ports to check the pressure when it's released?

 

[Nige]

There must be ports to check the pressure when it's released?

There are. It’ll take me a couple of days to come up with the info because I’m away from base at the moment.

Maybe time to invest in a service manual.?

 

[ZacharyMartin]

Brakes not fully releasing possibly.? They are spring applied and released by oil pressure, the oil in question being supplied from the transmission pump. Note my earlier recommendation about confirming work that was “apparently” done by others.

What did the transmission temperature gauge show.? Does it even work.?

Temperature was good, I got it pretty warm under a real hard load trying to break through a bunch of frost but If I'm correct the top right gauge is the torque converter temperature, which was warm but cooled off and stayed cool the rest of the time. Everything else was working and good.