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Wallis, TX | I don’t think there is any priority on the back scv on a 40 series. If there is one I’ve never seen it. The only priority is the one on the right side for steering and brakes.
As to your op, what size motor does the planter have? Where do you have your return? Do you have s case drain? If so is it dumping a lot of oil back to the trans case?
The reason I ask is the system relies on “used” oil returning to the scv. If it gets dumped into the trans the trans pump can’t make up enough oil to keep the front pump charged and you get surging. The same thing happens if you have a leak somewhere else in your hydraulic system. Most likely this would be in your 3 point/rockshaft area.
Another thing, is the surging fast like a vibration? If so you could have a bad check valve in the pump.
Edited by twraska 5/22/2018 08:28
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40 series Deere hydraulics
