Hydraulic system problem-(long post)

Posted by poorerbut on June 23, 2003 at 07:25:56 from (207.0.239.124):

I'm working on the hydraulics on my Love rowcrop and I've hit a snag. I can't find any hydraulic system diagrams to work with and I can't find another tractor with this type of system. It looks to be a closed-type system, with a Pesco belt-driven pump. There is a 2 qt reservoir that feeds the sytem-thru a 3 position spool valve [push-neutral-open]. The cylinder is a 3 inch bore-4 inch stroke (new). The feed line goes from the spool to the cylinder and the second hose from the cylinder(top) back to the reservoir.
I can push the cylinder out with the pump, but it doesn't want to empty.
I'd appreciate any help with this. I can't figure out if I have a vaccuum problem or air blockage.
If I knew the THEORY of the system, it would help,
but I don't have a clue where to look. I tried the sites for aircraft landing gears (where this pump was used) but no help there.
Thanks for any help.
pb

Follow Ups:

• Re: Hydraulic system problem-(long post) Thanks fellas... 10:30:18 06/24/03 (0)
• Re: Hydraulic system problem-(long post) T_Bone 12:18:35 06/23/03 (0)
• Re: Hydraulic system problem-(long post) evielboweviel 10:32:42 06/23/03 (0)
• Re: Hydraulic system problem-(long post) davidval 09:02:01 06/23/03 (0)

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