[AT] OT(?) Cub Cadet 1812 Hydro question

[Stephen Offiler]

Exactly!!

Steve O.

On Tue, Jun 2, 2009 at 11:15 AM, Mike Meulenberg <msm10301 at juno.com> wrote:
> I know how it is, when the grass is growing, there isn't a whole lot of time for monkeying around.
>
> ---------- Original Message ----------
> From: Stephen Offiler <soffiler at gmail.com>
> To: Antique tractor email discussion group <at at lists.antique-tractor.com>
> Subject: Re: [AT] OT(?) Cub Cadet 1812 Hydro question
> Date: Tue, 2 Jun 2009 07:22:10 -0400
>
> Interesting idea.  At this point Carter & Gruenewald has my money and
> the new valve will be on my doorstep momentarily.  Had a nice chat
> with Ken Updike to boot.  The old valve can become a science
> experiment.
>
> Steve O.
>
> On Mon, Jun 1, 2009 at 11:41 PM, Mike Meulenberg <msm10301 at juno.com> wrote:
>> What about using a high quality metal epoxy to reconnect the valves once you machine them apart? I see now that they make an epoxy that will hold copper water pipe fittings in place with out sweating. What would you have to lose other than the $5-6 for the epoxy. Mike M
>>
>> ---------- Original Message ----------
>> From: "Steve W." <falcon at telenet.net>
>> To: Antique tractor email discussion group <at at lists.antique-tractor.com>
>> Subject: Re: [AT] OT(?) Cub Cadet 1812 Hydro question
>> Date: Mon, 01 Jun 2009 13:53:03 -0400
>>
>> Stephen Offiler wrote:
>>> Hi SteveW:
>>>
>>> Thanks for the inputs; I appreciate it.  Everybody is telling me they
>>> are PRV's.  It's the shop manual that is calling them "check valves";
>>> wouldn't they know?  They appear to function as I'd expect a
>>> check-valve... the spring pressure on the ball is pretty light, so
>>> it'll flow pretty easily with a small pressure differential in one
>>> direction, and close up tight going back the other way.  I'd expect a
>>> PRV to have a much heavier spring, and to hold closed until the
>>> setpoint is reached.  My problem valve, PRV or not, is located in a
>>> port on the pump that leads directly to a line to a distribution
>>> block, and thus appears that they must normally flow in order to
>>> pressurize that block.  I guess my point is that, while hydraulics are
>>> NOT one of my specialties, these things do appear to me to be
>>> check-valves.  I think perhaps the saving grace in the distinction
>>> between the two types of valves is that this spring is pretty light,
>>> so I probably have a shot at getting it back together, whereas a heavy
>>> spring would be a bigger struggle.    And to think...  at first I was
>>> so pleased to learn how easy it was to access the area, and the
>>> specific component, that was the root cause of my mystery leak...
>>>
>>> Best regards,
>>> SteveO.
>>
>> If they are the ones on top of the hydro they are PRVs for the charge
>> pump. They are not very strong but they retain some pressure in the pump
>> to keep it operating without cavitation. They do act as a check valve in
>> that they don't allow the hydro fluid to return through them.
>>
>> If you have a lathe and a TIG they can be rebuilt. You need to cut some
>> of the crimp off then remove the shell. To reinstall the shell you can
>> do a couple things. One is to TIG a short collar onto the shell and
>> crimp the shell back on. I have also cut the bottom of the valve enough
>> that the original shell could just be roll crimped back on.
>>
>> --
>> Steve Williams
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