Mini-Ex Some controls/tracks/blade not working

[sikmusicfreak8]

So I bought a Gehl 602 (Mustang 6002) excavator at auction with known hydraulic problems. I was under the impression that all hydraulics weren't working, and assumed I needed to replace the pump. That was not the case.

So upon firing the machine, I can:
-Boom up
-Curl bucket in/out
-House rotates left/right

I cannot:
-Track machine forward/backward
-Blade up/down
-Boom down
-Extend/crowd the stick

Not sure if AUX circuit it functioning, dont have anything to test that yet.

I am kinda hoping I have an issue with some solenoid, or something with the pilot valve/circuit. Doesn't sounds like a pump to me, as I do have some controls working.

Am I barking up the right tree? I appreciate any insight, just looking for a direction to follow.

Thanks!

 

[bindian]

Get a hydraulic system diagram and see what the common points are in the controls that are not working. Make sure this common point is not connected to what is working. If you have two of them, swap them to see if the problem moves with the swap. That is what I would change first. It is not a pump UNLESS your have a two part pump or two pumps. Then it might be a pump or the back half of your two part pump.

To check a pump, swap lines between something working and not working to see if the problem stays or migrates. Or start going crazy installing pressure guages. But then you need the factory pressure specs.

When all else fails, call a factory mechanic and see if you can pick his brain. Get on Heavy Equipment Forum. More ex wrench turners there.
hugs, Brandi

 

[sikmusicfreak8]

I'm going to check all solenoids first, then go from there. It is a dual pump, with a 3rd pilot pump on the back.

 

[bindian]

Jason,
Sometimes the shafts between the pumps go out. Good luck.
hugs, Brandi

 

[Bilcon]

Very similar issues except opposite of yours, entire left side of machine works. Right side down. Did u figure it out?