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70 power steering trouble

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Author  [Modern View]

09-24-2012 17:48:16

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Does anyone know if parts are available for the steering gear? Something keeps stopping the wheel from turning, like it"s catching on something. It has the old style with the helix screw. Someone has really messed up the slot in the screw so I can"t really adjust it. Someone also shimmed up the relief valve on the pump trying to get it to work better. I set the relief valve and the flow control valve to specs, so that"s all set.When the wheel turns freely the steering works good, but something in the gear keeps stopping the wheel from turning.

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09-25-2012 15:38:54

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
Thank you for your help Bob. That sounds like what is going on.

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09-25-2012 11:28:09

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
Here is what Frank told me to do and it worked:

Nope. Stop right now and I can save you some work. I will lay odds that it is a step in the face of the cam on the end of the actuator sleeve. Look back in the archives for some of my previous repsonses on that, and you'll likely find some of the illustrations I ginned up in MS Paint.
If you remove the actuator sleeve, you'll find two short, 1/4" dowel pins. They ride on a form cam face and on a parallel form on the end of the actuator sleeve. When you turn the wheel and meet a resistance, the spring loaded pins ride up, or down depending on a LH or RH turn, and displace the actuator sleeve in a fore or aft direction. When this movement takes place, the lever hooked to the actuator sleeve pushes or pulls a spool valve which directs fluid to one side or the other of the rotary cylinder of the lower pedestal, and this assists your turn. Now over time, the pins get worn with flats, the cam faces get worn with flats right in the center of travel (straight ahead), so in combination, when you go to turn, the pins will not easily slide up the cam face, instead hanging up on the step until you give it a harder nudge, then it jumps right now, you get instant assist, but you feel it in the wheel as a "crunch" or jerk. Stoning the cam faces back to smooth and parallel and replacing the pins generally cures everything, provided you don't have any other leaking going on. Let me know when you mean to go through it. Be happy to tag along via e-mail.

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09-25-2012 11:13:52

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
You might search the archives for the answer to this. I had the same thing on my 620 power steering after rebuild. F.I.T knew the answer. I can't remember exactly, but there is a pin that probably needs ground down, or something like that. I gave the message to the guy who rebuilt mine, he followed Franks advice, and it has worked perfect ever since. Look in the archives, it had pictures and the works. Thanks again Frank in Tallahasee

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Larry in WNY

09-25-2012 09:18:31

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
Steering gear can be removed and rotated 180 degrees to use the other side which should have no wear if never moved before.


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Doug in IL

09-25-2012 08:57:45

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
I have one doing the exact same thing. Let us know what you find wrong with it.

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09-25-2012 06:29:20

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 Re: 70 power steering trouble in reply to 55deere70, 09-24-2012 17:48:16  
I have seen the wiper pin in the steering cyl broke off and laying down in the bottom .

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