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NW Washington | Well here is Wally's saved advise about Magnums and JD vacuum planters for second time this year.
This was copied from NewAgTalk some years ago and was written by Wally, a CIH service manager from Texas.
"Contrary to popular opinion, all of the Magnums are capable of running JD vacuum planters and/or multiple orbital motors. BUT, the early 7100's were very prone to hydraulic overheating in my experience. There are several design-related reasons: insufficient size of the hydraulic oil cooler, insufficient flow through the hydraulic cooling circuit, hydraulic reservoir capacity not large enough for the amount of total hydraulic flow. Lack of maintenance (Keeping the radiator and cooler cores clean and open) and failure of the viscous fan drive clutch causes hydraulic overheating. But the MAIN reason is that people don't adjust the flow control valves correctly. That valve block on the input hose coupler of a JD vac planter is also a 5-GPM flow limiter, so the instant the operator tries to tell the tractor to push 5.001 GPM through the JD valve block; your Magnum PFC system goes to high-pressure standby attempting to do what YOU told it to do. Constant operation at high-standby pressure in high ambient temperatures = hydraulic overheating. You JD vac boys need to open that 5-GPM needle valve wide open and lock it open; then carefully and slowly adjust the vacuum pressure with the remote flow control valve on the TRACTOR---not the JD valve, and no orifices on your other orbital motors, either. If your flow control valves are binding; then get them fixed; the hydraulic system can't work properly without them. Adjust the flow control/vacuum pressure in tiny, tiny steps and not by jerking a quarter-turn at a time. Quit turning them up when you get the exact pressure you want, or at the instant when the vacuum maxxes out. If you will just be smarter than the iron, then the oldest 7100 Magnum that was ever made will do just fine running orbital motors."
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7140 Magnum and 1770 vac: Will it or won't it?
