TexasGus
New member
Hi.. I'm a mechanic, not a tractor mechanic so bear with me. I've been working on an old JD400 with a backhoe on it.. we've repaired leaks (fuel and hydraulics) and even put a new hydraulic pump on it (had no power).. everything was straight up and I encountered no problems.. lots of power, smooth performance.
Except after maybe 100? hours of running with the new pump the controls have gotten very heavy or stiff and when you try to move the bucket or the hoe it swings or raises wildly.. it's dangerous! so it's parked until I can figure it out.
I have the manual and I'm not a dummy (really!) but I'm stumped on how to diagnose this or what component or components may be the cause.
Any help much appreciated.
Thanks!
Except after maybe 100? hours of running with the new pump the controls have gotten very heavy or stiff and when you try to move the bucket or the hoe it swings or raises wildly.. it's dangerous! so it's parked until I can figure it out.
I have the manual and I'm not a dummy (really!) but I'm stumped on how to diagnose this or what component or components may be the cause.
Any help much appreciated.
Thanks!
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