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Farmall & IHC Tractors Discussion Forum
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Touch Control Pistons

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Skycarp

02-07-2007 17:35:28




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I have my SC touch control on the bench preping it for paint. I was not able to move the lift arms even an inch by hand or with a rubber mallet in order to remove the pin on the left side lift arm to remove the leveling link. I finally took the lift arm off the rock shaft in order to remove the link. Later, I was blowing the old paint and rust off with an air gun and shot a jet of air into the oil return opening. The pistons extended fully under the air flow, and now they are locked in that position.

Why was I not able to move the pistons by hand?
Did I force the pistons past a safe point with the air jet?
Am I going to have to open up the cylinders now?

I hadn't intended on overhauling the touch control, just clean it up and paint it.

Thanks,

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Jim Becker

02-08-2007 12:17:21




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 Re: Touch Control Pistons in reply to Skycarp, 02-07-2007 17:35:28  
There are check valves inside the unit to keep force on the arms from moving the pistons. With no load on the arms, fairly modest pressure going the intended direction on the check valves will be able to move the pistons.



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john cub owner

02-07-2007 20:23:46




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 Re: Touch Control Pistons in reply to Skycarp, 02-07-2007 17:35:28  
move the hand control lever to the down position and apply air again. If that doesn't do ti, reassemble to tractor and follow the instructions for bleeding. There is a manual on line at Link



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JayWalt

02-07-2007 19:18:52




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 Re: Touch Control Pistons in reply to Skycarp, 02-07-2007 17:35:28  
this valves are made to control 1000psi, so i dont thin even a 135psi jet of air is going to hurt them..



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CNKS

02-07-2007 18:32:49




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 Re: Touch Control Pistons in reply to Skycarp, 02-07-2007 17:35:28  
You are pulling against negative pressure caused by the pistons. They are hard to remove anyway. Unless you have damaged something, (I don't know what), you should at least be able to move them, they will resist, trying to pull themselves back in, will feel "spongy".



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