[AT] hydraulics problem

[charlie hill]

Looks similar to old Ford car and truck power steering valve.

Charlie
----- Original Message ----- 
From: "Lew Best" <bee_keeper at earthlink.net>
To: "'Antique tractor email discussion group'" 
<at at lists.antique-tractor.com>
Sent: Friday, February 10, 2006 1:02 AM
Subject: RE: [AT] hydraulics problem


> Thanks Cecil
>
> Guess I wasn't clear enough; this is a rotary valve in the steering
> shaft.  When putting pressure on the wheel to say the right it sends
> pressure to the cylinder to "help" push the wheels one way.  Once you
> release the steering wheel (or stop because you've reached the point you
> want to turn it to) the valve drops back to neutral.  For a pic you can
> go to http://img.photobucket.com/albums/v707/lewbest/steervalve01.jpg.
> The top & bottom hoses go to the cylinder; right goes to pump pressure &
> left to pump suction.  The gearbox on the steering still functions;
> hydraulic power just "helps" move the steering knuckles.
>
> Lew
>
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Cecil Bearden
> Sent: Thursday, February 09, 2006 10:51 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] hydraulics problem
>
> Lew
> you mentioned that the roll pins had been replaced.    Check to see that
> the
> control valve can move in and out.  My old Massey had a slot that the
> roll
> pin in the control valve shaft slid in and out to regulate the fluid.  I
>
> reamed it out to pin it solid. and had no more Power steering...
>
> Cecil in OK
> ----- Original Message ----- 
> From: "Lew Best" <bee_keeper at earthlink.net>
> To: <at at lists.antique-tractor.com>
> Sent: Thursday, February 09, 2006 6:25 PM
> Subject: [AT] hydraulics problem
>
>
>>
>> Hey guys
>>
>> Got a problem; (so what else is new)?
>>
>> On an old John Deere 420 power steering it's doing something crazy!
>> Solved a few problems yesterday; got it to turning pretty good one way
>> but not near as good the other.  Had a bad leak on one of the rotten
> old
>> hoses coming from the control valve to the cylinder so replaced the
> hose
>> today thinking that would fix it.  Well, that made things worse!
> Seems
>> that when it had pressure on the good hose that the leak let the
> return
>> fluid from the cylinder out so it worked.  Now (with no leak for the
>> return flow) no turn either way.  Someone had obviously had problems
>> with this steering before (had sheared keys & roll pins, etc.) so now
>> I'm kinda grasping at straws.  What is obviously supposed to happen is
>> when you turn there should be pressure to one end of the cylinder
> making
>> it push & the fluid from the other end be allowed to go back to the
>> suction side of the pump.  Is there a check valve inside of the
> control
>> that could be stuck? I've removed the hoses one at a time (right, left
> &
>> return) & all seem to squirt fluid "when they should."
>>
>> BTW I wanted to replace one of the shafts in the valve (pretty well
>> mutilated) but the shaft is no longer available thru JD.  Asked about
> a
>> complete valve & same response.  Hate to tear into it not knowing if
> any
>> parts available (seals, etc.) but guess I'll have too.  No good the
> way
>> it is!  Anyone got one (or know of a source) without having to give an
>> arm & a leg for it?
>>
>> Any ideas appreciated!!!!!!!
>>
>> Lew
>>
>>
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>> _______________________________________________
>> AT mailing list
>> Remembering Our Friend Cecil Monson 11-4-2005
>> http://www.antique-tractor.com/mailman/listinfo/at
>
> _______________________________________________
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> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
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> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
>
>
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