D8K Need Info

[bob]

Pete, it was the slug 21 that fell out of the modulating relief valve, jamming it to the right during assembly.
The modulating relief was in a position that wouldn't let any oil flow through to the torque.
It or the priority valve could cause this problem if assembled incorrectly or where seized up from the tractor sitting for a long time, maybe with oil contaminated with much water or engine coolant.

Eduardo, I recommend you check the pressure at the filter top plug with a 800+ psi gauge while cranking the engine over with the fuel off Do Not Start The Engine.
Do this test before changing anything and then repeat the test after each suspected component is inspected.
If any work has been performed on the tractor look there first.
Come on back with what you find please.
Later Bob

[Eduardo]

Pete, it was the slug 21 that fell out of the modulating relief valve, jamming it to the right during assembly.
The modulating relief was in a position that wouldn't let any oil flow through to the torque.
It or the priority valve could cause this problem if assembled incorrectly or where seized up from the tractor sitting for a long time, maybe with oil contaminated with much water or engine coolant.

Eduardo, I recommend you check the pressure at the filter top plug with a 800+ psi gauge while cranking the engine over with the fuel off Do Not Start The Engine.
Do this test before changing anything and then repeat the test after each suspected component is inspected.
If any work has been performed on the tractor look there first.
Come on back with what you find please.
Later Bob

Bob,

Bob,

Thanks for adviser, I will check the pressure at the filter top plug with a 800 psi gauge while cranking the engine over with the fuel off. I will ensure do not start engine until is working the pressure very well in the transmission.

If pressure is bigger than 400 psi I will check .

Thanks

[Mike Walsh]

Bob. Thanks for the tutorial. There's nothing like experience. Every problem I've ever had has been related to too little pressure and would have bet money the Trans pump would not have caused that failure. I went by the shop and took a look at the book and I still can't figure out why excess pressure from the Trans pump would not dissipate into the system via the soft line that goes to the converter relief valve. I haven't had a pump apart in a very long time and didn't think to look in the book to determine if the output to the converter is separate from the output to the priority valve. Is there just too much oil volume and too little time.

[Old Magnet]

That's just a little bitty vent line coming off the pump.

[Eduardo]

Bob, Old Magnet,

Thanks for your inputs, now the D8K is working very well.


Thanks.

[Old Magnet]

That's good news. What did you find that was causing high pressure?

[Eduardo]

That's good news. What did you find that was causing high pressure?

Old Magnet,

The cause was fatigue of the filter housing.

Thank you.

[Old Magnet]

Hmmmm, I suppose it's possible but I had invisioned something much more dramatic like stuck valve, pressure spike that may have cleared the valve or some kind of external force. Hope it stays healthy for you, thanks for getting back.

[Mike Walsh]

Eduardo. What did the transmission filters look like. Normal, collapsed, swollen. Was the relief valve in the filter housing working properly.