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

[Bus Driver]

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
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>
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