[AJD] Remote hydraulic cylinder relief Valve ????

[Dean VP]

Bus Driver:

Thanks for the info. I sure don't recall having these valves on any
equipment on the farm in the 40's or 50's. I spent a long time in bed last
night w/o being able to get to sleep and a thought drifted through my foggy
mind. Could these valves be used to release the pressure on the quick
disconnect couplers so that they are easier to connect together?  I have
occasionally had trouble getting them connected due to pressure on the check
valves. 

Dean A. Van Peursem
Snohomish, WA 98290

I'm a walking storeroom of facts..... I've just lost the key to the
storeroom door 


www.deerelegacy.com

http://members.cox.net/classicweb/email.htm



-----Original Message-----
From: antique-johndeere-bounces at lists.antique-tractor.com
[mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
Bus Driver
Sent: Sunday, December 19, 2004 4:15 AM
To: Antique John Deere mailing list
Subject: Re: [AJD] Remote hydraulic cylinder relief Valve ????

Remote cylinders controlled by a valve that seals well, or by the
quick-disconnect couplings,  can experience an incredible range of pressures
with varying temperatures. Perhaps the implement will be stored in "The Big
Shed" (outdoors) until it is used next season. While in direct Sun,
sustained presssures in excess of 10K PSI have been measured in  closed
hydraulic systems. Perhaps JD had some other purpose in mind for the relief
valve, but this might be be one of the reasons for the valve.
----- Original Message ----- 
From: "Dean VP" <deanvp at att.net>
To: "AT JD" <antique-johndeere at lists.antique-tractor.com>
Sent: Sunday, December 19, 2004 2:47 AM
Subject: [AJD] Remote hydraulic cylinder relief Valve ????


> Could someone please explain to me what the function of the AF3002R or
> AF3798R Relief Valve is on a Remote Cylinder for a 520 through 730?  Are
> they required?  Are the two part numbers interchangeable w/o performance
> difference? What would the symptoms be if they were not used? Would these
> also be required when using a Roll-Over Plow such as an 820A?
>
> These may be a solution to a problem I'm having. TIA!
>
> Dean A. Van Peursem
> Snohomish, WA 98290
>
> I'm a walking storeroom of facts..... I've just lost the key to the
> storeroom door
>
>
> www.deerelegacy.com
>
> http://members.cox.net/classicweb/email.htm
>
>
>
>
>
> _______________________________________________
> Antique-johndeere mailing list
> http://www.antique-tractor.com/mailman/listinfo/antique-johndeere

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