Recent D17 IV hydraulic discussion

Bob Bancroft · Apr 9, 2017

A recent question on a D17 IV hydraulic valve operation got several responses, each quite different.

I based my response on the recollection of operating a semi-mounted plow on a 185. The rear end of the plow would always take priority over the front.

I just bought a 175, and making the assumption that it operates the same as a D17 IV, I just experimented with it. If either remote is held against the relief valve, the three point is dead. Either remote running an orbit motor kills the three point.

There is no priority valve, nor any kind of apportionment so far as I can see. The farthest left valve operated in the stack gets all the flow, until it is cancelled. Then, apparently all return flow is directed to the sump, rather than being available to power any valve "beyond".

DrAllis · Apr 9, 2017

I get myself confused from the older systems to the newer systems sometimes. On any of the systems you're referring to (D-17IV-170-175-180-185-190-200-210-220-7000) the oil flow comes in the left side of the valve stack (and exits the right side), making the left set of outlets first in line for oil. Next would be the right set of outlets, and then finally the 3 point hitch. When plowing with a semi-mounted plow, I always activated the hitch first and then the tail wheel, never both levers at the same time. Hitch lift time was probably 2 seconds at full throttle, and when the hitch was clear up, the last bottom wasn't in the ground very much anyway. If you had two remote cylinders connected (and fully retracted) to the tractor and the 3pt hitch down, the following should happen: with all three levers pulled rearward into the raise position (with the engine OFF) upon engine start-up the left cylinder should fully stroke and cancel the lever, then the right cylinder should fully stroke and cancel the lever and then the hitch should raise and then cancel the lever. This assumes all lever cancel screws are adjusted correctly.

Allis Dave · Apr 10, 2017

When plowing with a semi-mount plow, Grandpa always made us operate it as Doc said. When starting, you dropped the 3pt first then the tail wheel. Before turning, you'd pick up the 3pt then the back wheel. This made your ends straight, especially with a bigger 5-6 bottom. Grandpa was kinder when Grandkids came along, but my Grandma and uncle said you'd be in trouble if your ends weren't straight.

Bob Bancroft · Apr 10, 2017

We did the same thing. But there were times when you would notice the front of the plow stopping just before it was all the way up, as the rear raised, then the front would catch up.

Recent D17 IV hydraulic discussion

Bob Bancroft

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DrAllis

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Allis Dave

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Bob Bancroft

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