Darn, thought it might be that simple. You have it hooked exactly right from your description. I think what you have going is a leaky, missing or broken signal check valve between the first valve and the other valves. To test for this, you can remove the signal line from number one valve, start engine low idle, activate one of other valves and if oil comes shooting out it is signal valve problem. Also, before unhooking anything, see if the other valves work with motor valve in neutral, and again if they will latch when motor valve is running your planter. A valve receiving no oil will stay latched but one trying to work will kick back off.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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