ford 1520 hst hydraulic drive fades bad when hot

[milacamud]

I have a 1520 ford hst. When the hydraulics warm up it loses all power for the drive system in all three ranges.the loader and three point all work fine. The fluid is full . any ideas?? Thanks for the help..

 

[Don H]

When was the last time you changed the hyd. filters? What does the fluid look like?

 

[No Quarter]

I have a 1520 ford hst. When the hydraulics warm up it loses all power for the drive system in all three ranges.the loader and three point all work fine. The fluid is full . any ideas?? Thanks for the help..

milacamud, did you figure out the problem? I don't know if this is the same issue I had, but, when you say HOT does that mean the temperature gauge was hot or the tractor was just warmed up. My gauge was in the red and I lost most power for the drive also. I was low on radiator coolant. Added coolant and I was back to operating again. TJ

 

[Raw Dodge]

Sounds like a hydraulic pump issue,hopefully it isn't,but it seems like it. it's possible the or rings or relief valves are stuck open slightly or leaking,you may want to grab a service manual and hydro flow/ diagnostic chart.