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Case Tractors Discussion Forum
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Draft O Matic HELP!

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Firemanjohn

06-10-2007 18:27:59




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I have been unable to get my 830 high crop hitch to raise and feel from what everyone told me it is the control valve. In order to take that off to repair I had to take the top cover off of the draft o matic mechanism. It is amazing how much condensation was in there. Once it is apart I have never seen so much linkage to make something go up and down. I even had a piece shaped like a boomerang fall down into the case. I need to play the lottery because it landed on the bull gear and stayed. So my question is how the heck do I get it back together? Even with a diagram, which is not in my parts book, I can not manuever everything into the perfect position to fit back together can I? Someone HELP.

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TexasWren

06-13-2007 19:16:29




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 Re: Draft O Matic HELP! in reply to Firemanjohn, 06-10-2007 18:27:59  
I just did this recently. Parts shouldn't have fallen off into the tranny, unless the linkage retainers were gone. After trying to use the I&T manual, I bit the bullet and got the photocopies of the original CASE shop manuals. Expensive, but it has detailed descriptions and explanations for how the DOM works (the injection, pump however, IS a separate manual, for good reason). Think of the DOM it as an analog multi-input control computer, and you'll see it ain't so complicated after all!

I'm still having problems with mine, though, even after rebuilding the control valve. It's not correcting when the arms sink down, and it's still slow as heck to respond, even with the engine revved up (got plenty of pressure at the remotes, so the pump is still good). I didn't go through that complicated calibration and adjustment procedure, though, so I probably should (sigh).

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Camboted

06-11-2007 04:52:48




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 Re: Draft O Matic HELP! in reply to Firemanjohn, 06-10-2007 18:27:59  
You really need to get a service manual or an IT manual off of ebay or on this site. Trying to talk you through this would be very difficult. Allow me to say this, a lot of the linkage is draft control stuff, and to be honest, since we pull disc plows in Cambodia, we don't even hook it up, but the main thing is to take out all the spools and clean them and install new o-rings. The main one is the easiest to miss. It is on the engine side of the valve and, if I remember correctly, you will need a internal snap ring plier to get it out. 10 to one there is some crud in there. LOL!

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firemanjohn

06-11-2007 06:14:35




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 Re: Draft O Matic HELP! in reply to Camboted, 06-11-2007 04:52:48  
Thank you very much. I just found a basic picture in my IT service manual which might help. Have a parts manual also, quite a racket Case has because the draft o matic system is a different parts manual for another 30 bucks. When you are used to a VAC all this newfangled stuff is confusing.



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