I have a 1966 Case 530CK. I had the diesel motor rebuilt because it spun a bearing, and now the power steering doesn"t work. It worked great before the rebuild. Fluid pumps out of the power pump, but I don"t know how much pressure it should have. No leaks, but no power support. Filter was replaced, fresh tractor fluid installed. I"m thinking something happened to the pump while sitting during the rebuild, or an air bubble is still in the system. Any suggestions on troubleshooting greatly appreciated!
- Thread starter gmac1
- Start date
John Saeli
Well-known Member
On the ag tractors w/ hydrostatic steering, the shop manual says to jack the front end up & actually grab the wheels & move them full left to full right, extending & closing the cylinders, making sure the resoivoir is kept full. That might help work air out. Hard to imagine that something could have happened to the pump.
John Saeli
Well-known Member
Says: "Pump relief valve pressure should be 1500 to 1700 PSI @ 1500 RPM. If press. not correct, REPLACE, DO NOT ATTEMPT TO ADJUST RELIEF VALVE". To bleed, the Manual says to jack the front end up, & spin the steering wheel as fast as you can, full left to full right. If that doesn't work, "rapidly deflect the front wheels by hand". Eventually, you will get them primed.
As long as the system is not bled and the pump has no resistance to pump against it will not show any pressure. It will be a mistake to disassemble it if it was working well before disassembly. Pumps just don't sit there and make rated pressure whenever the engine is running in an open center system.
The problem is a air lock in the handpump (steering wheel pump) side of the circuit and the hand pump has to get oil to work. The lines from that go to the steering valve endcaps and put pressure on the ends of the valve spool to shift it from side to side to direct pump flo to the proper lines to force the cylinders to move, that's what is not happening.
Maybe you could fabricate a way to force oil back the lines that go up from the valve to the steerng wheel area. Disconnect both of those lines and slip a rubber hose over one and try filling the hose with oil and turning the wheel to pull it in, height may help you to get oil to that handpump. I have had this happen many time over my career. Dont disassemble a bunch of stuff until you have exhausted all other options, this is a common problem.
mEl
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