LT40 Super HD pumps.

[Dave Shepard]

One of my HD solenoids has died, but the hydraulics are still working with the one pump. The problem is, I don't seem to be getting the same power, albeit at a slower speed, as I was before. If I dead head one of the functions, the diagnistic gauge in the hydraulic box reads about 2100 psi. That should be enough to raise a big log with the loader arms, but I was having trouble with one that it should have lifted easily. I've heard of issues with fluid leaking out when one pump is dead, but that isn't happening in this case. Both pumps are filled to spec. I was going to steal the solenoid by the battery, but decided I could wait until WM could ship a new one.

[Magicman]

The operating pump should be overfilling the non-operating pump.  The loader should still lift the same weight, but slower.

It sounds like your operating pump may need attention.  ??

[Dave Shepard]

That's what I thought should be happening. The one working pump is making pressure, so I don't understand what is going on. When it first Halpern's, I took the cover iffy the hydraulic box to make sure it wasn't leaking fluid and to try and diagnose why the other pump want running. I didn't have my multi meter, and it want leaking, so I kept sawing, as I had people there to help. After I put the cover back on, both pumps were running and everything was fine until the next time I shut the mill off. I may steal that solenoid after all, just to see if everting starts working properly again.

[Magicman]

When you order solenoids get 2.  That is an "always" spare item for me.

[Kbeitz]

If the solenoids sticking you might be able to get it going again by tapping it when its engerized.
Might buy you some time.

[Dave Shepard]

MM, yes, that was my thought as well. I've already replaced the one next to the fuse box, which I don't think your revision mill has.

I haven't tried tapping while energized. I'll try that.

[Magicman]

I've already replaced the one next to the fuse box, which I don't think your revision mill has.

Oh yes, and I have also upgraded the fuses to the newer version.


 

[Dave Shepard]

For some reason, I thought you didn't have that one. Maybe it's the hydraulic mills with the small control box that didn't have them. '96 to early '97 ish and older?

[Magicman]

The major revisions were sometime in '97.