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Ford Tractors Discussion Forum
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Re: 641 Power Steering Conundrum - 2nd Verse

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UseFixUse

09-17-2013 06:43:41
98.191.132.188



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Thanks for the picture Kurt-NEPA. Here is a picture of my 641 PS pump. The outside looks like your pic of an Eaton pump. When I opened mine up, the inside matched the guts of a roller vane pump on page 35 of the I&T Shop Service Manual.
Did the Eaton and the Roller Vane pump have similar exterior?
Also, as far as pressure testing, I will probably order a pressure gauge (0-2,000psi) and try to cobble together plumbing to test the PS pump output. I hear ford brake line may help. Thanks for your input.

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UseFixUse

09-25-2013 19:23:52
68.102.59.210



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 Re: 641 Power Steering Conundrum - 2nd Verse in reply to UseFixUse, 09-17-2013 06:43:41  
Gentlemen, my new gauge arrived so I plumbed it into the pressure side of the power steering pump. I found zero psi with a faint flicker on the first rev of the pump. I figured bad pressure relief valve or bad pump. I pulled and dissembled the pump, clamped the shaft in a rubber jawed vice and hand-torqued the roller carrier and found that I could turn it on the shaft. It turns out the drive-key had worn and allowed the shaft to spin free. It had also hollowed out one side of the keyway in the roller-carrier. I ordered a roller-carrier and drive-key. I'll report on what I hope will be the final verse of my first adventure into power steering repair. Thanks again for all the advice and observations.

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UseFixUse

09-26-2013 07:15:37
98.191.132.188



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 Re: 641 Power Steering Conundrum - 2nd Verse in reply to UseFixUse, 09-25-2013 19:23:52  
Thank you for the site referral. I just went there and found a world of information. These great clubs and people willing to share time and information helps me worry a little less about breaking something on the old machinery.



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UseFixUse

10-10-2013 08:15:19
98.191.132.188



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 Re: 641 Power Steering Conundrum - 2nd Verse in reply to UseFixUse, 09-26-2013 07:15:37  
I finally had time to get back to my baby in the shop. The roller-carrier and drive-key had been delivered so I carefully washed the innards of the Eaton PS pump in solvent, then dipped them in 134 oil before assembling them. The only assembly advice I can offer anyone doing this is to be very careful when inserting the lubricated drive shaft through the seal. The sharp change in diameter on the shaft wants to catch the inside of the seal. Try inserting the shaft from the other side.
I reinstalled the pump, filled it with 134 oil and started the engine. Power steering never felt so good! It works better than ever before!
On a side note, for anyone interested, as suggested in an earlier post to me, I don't think it makes any difference which side is up on the spool in the control valve, at least on my 1961 Model 641.
Thanks very much for all the advice. It made my first PS adventure less frustrating and more fun.

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UseFixUse

09-21-2013 08:40:32
98.191.132.188



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 Re: 641 Power Steering Conundrum - 2nd Verse in reply to UseFixUse, 09-17-2013 06:43:41  
Thanks a lot, Kurt-NEPA, for your input and the link to the Eaton pumps rebuilding site. Lots of good info on that site. I have ordered a 0-2000 psi gauge and will then build some plumbing around it so I can start ruling out components starting with the PS pump.
Just to be sure, the photo is of an Eaton pump, right?

Thanks again.

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