Rowski
Veteran Member
- Joined
- May 18, 2000
- Messages
- 1,481
- Location
- North Central Vermont, Jay Peak Area
- Tractor
- 2004 New Holland TN70DA with 32LC loader, 2000 New Holland 2120 with Curtis cab, 7309 loader
My New Holland 759C backhoe is giving me some trouble. Basically all the funtions work fine. The problem lies when you trying to pick up something heavy and hold it there. You can see it better and more controled when you try to pick up the rear of the tractor, or at least unweight it. The only circut effected is the boom cylinder. The curl and dipper work fine, at least they seem too. When you try to unweight the rear of the tractor and go as far a the relief valve lets you and put the control stick in its neutral position you can see the cylinder "leaking" down. I have checked for external hydraulic leaks and could not find any. So it seems that the possibilities are: the cylinder has an internal leak, the spool valve is leaaking by, or the relief valves are not fully seated (small peice of dirt). Does anybody have any ideas as to what might be going on? Are there any steps that can be taken to further diagnose the problem? The backhoe is only 2 years old. Attached is a diagram that I have with the operators manual. The spool valve that controls the boom is #39 which is on the right side of the diagram.
As a note this problem may have been present ever since day one.
Thanks for your help!
As a note this problem may have been present ever since day one.
Thanks for your help!