Wish I knew. I got rid of my 4040 for that same reason. I'd had the 2 speed in the quad range replaced a few years earlier,so I don't think there was a connection. I was chopping,pulled out on a headland,pulled the lever back and it wouldn't stop. I chopped for a few days that was with the lever disengaged and it never even slipped. I talked to the service manager at the dealer,he didn't know. Thought it might be the valve on the side. Said usually when the little arm in the valve breaks (must happen quite often) it won't engage,but thought it must have gotten crosssed up and was keeping it engaged. I bought the parts,went home and pulled it out and that wasn't it. The tractor had a lot of hours on it,it had cost me a fortune to have it split and have the new two speed put in and I wasn't going to do it again,so I traded it off.
If anybody knows what the cause is,I'd sure like to know.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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