M7040 shuttle problem

[Mark Robke]

Exactly, you read what is going on with a correctly operating valve, so any deviation will point to the problem, be it the proportionally reducing valve, the shuttle valve, the inching valve and so on.
It's a testable process of elimination.
Do all the pressure tests in all possible test scenarios and it will point to the problem or problems if there are multiple issue.
Testing these kinds of issues is a simple matter of you will see this pressure or the lack of pressure (bad behavior) and it will be caused by this fault (bad part).

Thanks for your insight- I was mostly going by page 3-S13 (pressure readings) - thinking, 'does bad pressure readings indicate a problem in the valve, or elsewhere'? According to your logic then, bad readings would indicate the shuttle valve is bad. I don't believe it is rebuildable, and was not intended to be disassembled. My hunch all along is that something is sticking only when it gets hot-so we shall see I hope! Good pressure readings would indicate my problem is elsewhere, not the valve. Thanks for all your time. When I have time, after hay is done, I will dive deeper into this, and I will let you all know what I find. Mark.

 

[JasonW]

Any update on this?
I’ll ad more information. Yesterday I had a log caught and crushed the front side of the skid plate and fuel tank from underneath on my M6040. You can remove the fuel tank WITHOUT removing the tire OR fender.

Took longer to drain the tank than to actually remove it. Good news I was able to pop the tank back in shape and finessed the skid plate to resemble the original shape.

 

[Mark Robke]

It is actually at the local Kubota dealer. They did the pressure tests (I do not have a gauge or fittings) and made a case with Kubota. The next step was to split the tractor, and they found the clutch pack o rings looking flat and one sketchy spot on one. The parts are ordered. I wondered if the o rings would have allowed slippage though. It never slipped at all. The clutch discs measured new specs. Mark.

 

[Fedup]

I can't help wondering what the pressure readings might have been that indicated they needed to make a case with Kubota. The tractor is (probably) fifteen years old, so Kubota's not likely to be too deeply interested in decisions on repairs. Or maybe they simply went up the chain because they didn't know what to do next?

Let us know how it works out when you get the tractor back.