Posted by Stones Throw Farm on January 17, 2008 at 05:45:58 from (205.188.116.73):
Hi All,
Quick recap. (from a inquiry a week or two ago) I have a Super A with a Pesco pump. The pump and hydraulics were operating fine. I found the pump seal to be leaking and replaced the seal. Other than the leaky seal the pump looks great. I reinstalled the pump and since doing so have not been able to operate the hydraulics. I really appreciate all the suggestions on pump priming and yet still don"t seem to be having much luck. I"ve had the pump apart again and rebuilt to check for "goofiness" and have gone through the same processes to no avail. If I crack the manifold lines it appears there is fluid getting to the pump.
I either have no hydraulics what so ever. Or on two occasions if the tractor has sat for a night or so since adding fluid-etc. I can come out in the morning and will have VERY SLOW movement of the hydraulic arms. If I put any resistance on them theres no pressure. Each time I"ve done this I"ve then decided to open the filler plug to try bleeding air as recommended and as soon as I"ve done so I have no hydraulic movement and don"t seem to get it back.(even after putting the plug back in)
I"ve read up on the hydraulic trouble shooting. I don"t have a Schrader Gage to confirm pressures but it wouldn"t seem to matter. The two areas that address "will not lift load" or "slow movement" both point to either; bad pump, regulator/safety valves stuck, weak/broken safety valves, excessive safety valve clearance, orifice plug opening to large.
As I mentioned before other than the leaky seal everything worked fine before. I"m assuming / hoping that a simultaneous "new problem" didn"t spontaneously arise ie. regulator/safety valve/orifice stuff...but don"t have or know of any way to confirm this?!
If the pump is not getting primed still I"m pretty stumped.
If the pump is now not functioning than I"m left with buying a new one, but am concerned that I could be replacing a functional pump and will still have no hydraulics.
Just trolling for thoughts! The tractor doesn"t have much to say when we"re in the garage together.
Any other trouble shooting, valve checking, pump checking, ideas.....
Has anyone ever had safety valve/etc issues? Any thoughts on opening up the Hydraulic Cyclinder and Valves Unit?? It seems like quite a job potentially...
We"ll keep plugging! I really appreciate everyones ideas...
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