Transplant hydraulics from 601 to 821 ???

I am transplanting the hydraulics from a 601
to my 821 (only has PTO). I have the hydraulics lid
on a motor stand and am ready to install
it on my 821.
First, I noticed a ?plug?/valve? near the
bottom of the 601 that is not on my 821.
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Should I try to remove it?
I plan on taking the next steps, let me know if I'm wrong.

1) Gasket on lid is excellent should I just coat
821 housing with Permitex blue?
2) Use OLD O rings??
3)Anything necessary on hydraulics after 30+ years
of in-operation, while on motor puller??
4) Things to do to transplant Piston pump and
manifold? (4 new O rings?).
5) pump is pushing fluid on 601 by hand cranking.
do I just fill manifold with fluid before attaching
pump?.
6) Torque specs on lid and pump bolts?

Did I miss anything??
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I know there is a removable plate under the
hydraulics lines outside underneath the reservoir.
Is this where the relief valve is located?
 
(quoted from post at 12:25:09 11/14/17) yes, I believe it installs from below via that plate.

I just removed that plate we're talking about not 20 minutes ago on my 640. I don't remember seeing much in there. Will check again after dinner
 
Parts book says thats Hydraulic pump relief valve. I would get a new OEM gasket for that. Hylomar makes a good sealant. It dries quickly, use sparingly, put on your finger and smear it
 
(quoted from post at 05:29:58 11/15/17) Parts book says thats Hydraulic pump relief valve. I would get a new OEM gasket for that. Hylomar makes a good sealant. It dries quickly, use sparingly, put on your finger and smear it

I'll see what comes off of the
donor tractor.
 
I see the relief valve is in the 601.
I have removed the bottom plate and I am not
sure if I use a block of wood from above to
push (tap) the protruding valve to fall
out the bottom.
 
(quoted from post at 10:39:54 11/15/17) I see the relief valve is in the 601.
I have removed the bottom plate and I am not
sure if I use a block of wood from above to
push (tap) the protruding valve to fall
out the bottom.

Yes a light tap with a long block of wood from inside the box. It will fall out the bottom. Of course the bottom plate must off. I took mine today and may replace the orings when my gaskets and o-ring kit comes tomorrow
 

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