Provided that some one has not taken the aux valves off and lost the plug with o-ring on it , your problem is in the flow divider valve. You said it works when you dead head one of the other valves so that shows that flow divider is leaking past to aux valves. The spool wears the most but bore wears also. I was able to get a new spool just a few years ago, however, lot of parts men don't know how to look up the number as it was originally not a service item but was after they got a few years old. An accurate flow rater down to 3 gal per minute would show your problem in a quick test. I know, not everyone has one, I don't either anymore but I always seem to devise some other type of test to with a hose , a restrictor valve with a gauge on it and a bucket.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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