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Case Tractors Discussion Forum
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1966 530CK Power Steering problem

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gmac1

04-01-2012 17:43:25




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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!

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gmac1

04-05-2012 17:42:44




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-01-2012 17:43:25  
Thanks for the great advice. I'll try getting oil into the manual pump as you suggest.



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gmac1

04-02-2012 19:24:44




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-01-2012 17:43:25  
I must have a pump issue. No way we had that kind of pressure when we disconnected the outflow. Maybe a reassembly issue, or a blown seal. I'll pull the pump and see if anything jumps out.

Thanks for the help!



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mEl

04-03-2012 04:32:08




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-02-2012 19:24:44  
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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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gmac1

04-14-2012 05:45:06




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 Re: 1966 530CK Power Steering problem in reply to mEl, 04-03-2012 04:32:08  
mE1 - We got some oil into the lines feeding the hand pump, and that seems to have done the trick. Just one thing - it steers very easy below 1000rpms. Above that it gets hard again. Is that normal? Thanks for your help



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gmac1

04-02-2012 15:59:54




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-01-2012 17:43:25  
Thanks, John. We did try that - a front loader makes it easy to lift the wheels. We did maybe 10 turns each way. Maybe we need to do it more. Does your manual give specs for the output of the pump?



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John Saeli

04-02-2012 18:11:14




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-02-2012 15:59:54  
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.



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John Saeli

04-02-2012 14:57:41




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 Re: 1966 530CK Power Steering problem in reply to gmac1, 04-01-2012 17:43:25  
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.



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