Super A touch control pressure test

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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Gerry Powell
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Super A touch control pressure test

Postby Gerry Powell » Sun Oct 30, 2011 8:11 pm

My touch control unit will not lift as much as it used to and I wanted to make the pressure test in the IH manual. It says to install the pressure gauge in place of the rear pipe plug (1/4 inch) in the manifold rear flange. But I looked at the manifold and don't see a pipe plug, can someone tell me where it is?
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Re: Super A touch control pressure test

Postby Boss Hog » Sun Oct 30, 2011 8:28 pm

You will have to take the plug out, it is where the manifold is bolted to the T/C block
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Re: Super A touch control pressure test

Postby Bigdog » Sun Oct 30, 2011 8:53 pm

It's the plug in line with the smaller diameter line in this picture from TM Tractor's site:

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Re: Super A touch control pressure test

Postby Gerry Powell » Sun Oct 30, 2011 10:05 pm

On the SA, I guess it is the one inline with the small tube also, which is toward the rear like the manual says. These have allen head plugs, I was looking for a regular pipe plug.
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Re: Super A touch control pressure test

Postby John *.?-!.* cub owner » Mon Oct 31, 2011 8:34 am

Also expect them to be VERY tight.
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Re: Super A touch control pressure test

Postby Rudi » Mon Oct 31, 2011 10:41 am

Gerry:

Image to what John said...

You will probably need the proper hex head socket to take it out. Allen keys just don't cut it :roll: :(
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Gerry Powell
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Re: Super A touch control pressure test

Postby Gerry Powell » Mon Oct 31, 2011 11:22 am

I did the test procedure and it passed so I guess it's working as intended, maybe I'm just trying to lift to much. Right, the plug was tough to get out, I finally put some heat on it with a small torch and some PB. I used a hydraulic gauge and it max pressure was 1100 psi on both cylinders. I used two SA wheel weights lifted from the rear rockshaft.
The only thing I would like to fix is a slow leak from near the leather boots. I have seen a post before but can't find it now about doing this without removing the unit from the tractor. Has anyone done this?
Rudi, thanks for the manual and thanks to everyone for the help.
Gerry

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Re: Super A touch control pressure test

Postby Boss Hog » Mon Oct 31, 2011 11:33 am

It will have to be removed to put the seals in as the valves slide out the head side
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Re: Super A touch control pressure test

Postby Gerry Powell » Tue Nov 01, 2011 4:06 pm

Well, I took it apart today for a rebuild and had a few problems. The worst is a broken control valve pin (looks like it has been broken for a long time) 41A in the parts diagram, 354 358 R1 which is discontinued according to my local IH. I ordered the rebuild kit but still need the pin. Does anyone have an extra?
Gerry
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Re: Super A touch control pressure test

Postby John *.?-!.* cub owner » Tue Nov 01, 2011 4:32 pm

Assuming that is similar to the one in cubs, it is an off the shelf and should be available at most hardware and auto parts stores. Or use a grade 8 bolt and lock nut.
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Gerry Powell
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Re: Super A touch control pressure test

Postby Gerry Powell » Tue Nov 01, 2011 6:13 pm

That is my fallback plan but I'd like to find an original. For the SA, it's special in that it has a reduced diameter in the middle for a setscrew to hold in (along with a cotter pin) and it is very hard steel, not mild steel. A grade 8 might have to work if I can't find the real pin.
Gerry

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Re: Super A touch control pressure test

Postby John *.?-!.* cub owner » Tue Nov 01, 2011 7:36 pm

with that groove, an aftermarket pin would not work, they are surface hardened, so that leaves the grade 8 bolt.
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Gerry Powell
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Re: Super A touch control pressure test

Postby Gerry Powell » Sat Nov 05, 2011 6:04 pm

I'm putting my SA touch control back together and was wondering if anyone knows the torque spec for the piston connecting rod. For the SA, is there a list of torque specs, I haven't been able to find anything. I saw in the Cub BOK rebuild, the torque was 75 ft-lbs, maybe the same for the SA.
Gerry


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