Hydraulic Drive Problem

[wgraves]

Hi Everyone,

I am having a hydraulic drive problem on my 1991 Toyota 2SDK7 skid steer and I'm hoping there are some hydraulic experts on here that can help.

The skid steer is steered using the levers. Everything works fine when the unit is cold, but once it warms up, whenever you put it under even moderate load, the right lever just "gives out" and there is no drive on the right side. If you go back to neutral and start again you're good until you put moderate load on it again.

I was originally thinking pressure relief valves. There are four. I swapped them around assuming the issue would more to the left side if that was the case. Nope, still on the right side. I have changed all oils and filters as well.

Any ideas?

Thanks,

Wes

 

[Firefighter]

it would appear to be a drive motor fault or possibly a hydro pump that has scarring internally causing a lose of
oil pressure when hot. i dont know the type of motor they have. but its possible its bypassing seals internally also
also saying no drive meaning both directions or just forward?

 

[wgraves]

it would appear to be a drive motor fault or possibly a hydro pump that has scarring internally causing a lose of
oil pressure when hot. i dont know the type of motor they have. but its possible its bypassing seals internally also
also saying no drive meaning both directions or just forward?

Just forward. Reverse works fine.