[AT] PTO pump on ebay

[John Grant]

John, If anything John Deere engineers were smart and kept things simple. 
The air came from the outside of course thru the piston inside the pump 
body. There is a leather cup that goes around the piston and is sorta upside 
down so that as the piston is on the compression stroke air is forced by the 
check valve and out the hose. On the up stroke or intake the ball check 
valve closes to retain what was pumped and the cylinder fills with "new" air 
for the next compression. Two checks of sorts, the ball check and the 
leather cup retaining plate.
As far a the pump on e-Bay, I think it's ok as the ball check is inside the 
"pipe" fitting which really is the ball check body and a spud for the hose 
to hook to.
 Glad you got what you need. Regards,  JG
----- Original Message ----- 
From: "John Wilkens" <jwilkens at eoni.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Tuesday, January 02, 2007 9:26 PM
Subject: Re: [AT] PTO pump on ebay


> John, this string is typical of how difficult it is sometimes to describe 
> a mechanical thing in written descriptions without the air of photos or 
> drawings--or face to face converstaions so everyone gets the same picture! 
> I tried but failed big time...again!  Anyway, I think the problem, is 
> solved since I just purchased two complete "vintage" spark plug hole tire 
> inflaters with hoses, gauges adapters and the valves for $9.99 (I was the 
> only bidder).  These both have the 1 or 2-way valve that will fit the 
> spark plug hole that I was looking for.  I might need to make an adapter. 
> In my case these valves (one) can screw into the head of the pump to 
> replace the valve that is missing.  They will screw into the head of the 
> pump and stick up a couple inches.  That's what I remember seeing years 
> ago on a pto pump....but it was not a JD pump.  The ebay JD pto pump looks 
> like it just has a short pipe screwed into the top of the JD pump 
> head/cylinder with a hose clamped to it.  I've never seen one of these JD 
> pumps so maybe there is a 1-way valve screwed down into the cylinder that 
> you can't see in the ebay photo.  I suspect the valve is missing and 
> someone just screwed the pipe in the pump to try to get it to work?. 
> Here's the part that I still cannot figure:  assuming there is a 
> spring-loaded ball valve in the top of the valve to prevent pressurized 
> air in the hose from returning to the pump on the down stroke, where does 
> the recharge air come from that needs to flow into the pump on the down 
> stroke?  And if there is another air passage between the "spring loaded 
> ball valve" to allow recharge air in the pump how is THAT air passage 
> closed off so air compressed on the up stroke doesn't just run out? 
> Seems like there would have to be two spring loaded ball valves.  OK, I'm 
> through!    John W.
>
> At 03:11 PM 01/02/2007, you wrote:
>>John Wilkens. John, using the John Deere tire pump presently on e-Bay 
>>#110074738700, as an example. The valve keeping the air pumped in the 
>>object pumped up, tire, basket ball, etc, in in the end where the hose is 
>>hooked to. The "valve" in enclosed in the pipe plug valve assy which is 
>>inserted (screwed) into the pump body. When you say what you need is at 
>>the top of the pump, I don't understand what you are looking for. Most PTO 
>>pumps work off the same basic style. The only object that might be missing 
>>from this JD pump would be a cast iron Guard covering the end of the air 
>>piston and crank so that fingers and other body parts needed at one time 
>>or other don't accidentally get involved in the tire pump operation. 
>>(Ouch).
>>I'm still not clear on what you need other than this valve set up. 
>>Regards,  John Grant
>>----- Original Message ----- From: "John Wilkens" <jwilkens at eoni.com>
>>To: "Antique tractor email discussion group" 
>><at at lists.antique-tractor.com>
>>Sent: Tuesday, January 02, 2007 5:00 PM
>>Subject: Re: [AT] PTO pump on ebay
>>
>>
>>>Thanks Gene and DAve.  Looks to me like the valve I need is missing from 
>>>the top of the pump.  Maybe the JD versions had some other arrangement. 
>>>John W.
>>>
>>>
>>>At 07:51 AM 01/02/2007, you wrote:
>>>>    There is a John Deere PTO air pump on ebay right now. Present bid is 
>>>> $20.00
>>>>
>>>>    Item number  110074738700
>>>>
>>>>                        Gene
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>>>
>>>
>>>                    In the wide-open spaces of NE Oregon
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>>>
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>
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