D2 5u Hyd. pump

Single or dual valve 44? Diverted valve in proper orientation? Adequate amount of hydraulic fluid in reservoir? Any stops or locks on the ram for the plow?

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Does the pump build up pressure? Try to lift the plow at all? How do you have the ports of the left side hydraulic pipes blocked? Does the cylinder work if you use some other source to actuate it?

If it’s building up pressure but just can’t quite lift it, I would check pressure, but more than likely you just need a bigger cylinder or another cylinder beside the existing one might work and be cheaper.

I’m thinking another cylinder and two pins about a foot long and you could probably double your lifting power. Of course a single larger diameter cylinder would be a cleaner installation.

I think the #44 relief is set at 1250 psi but I could be wrong. I don’t have a book anymore. Of course if your pump won’t build 1250 you only get what it’ll build! As I remember the system operates at 1000 psi. I doubt the standard tractor systems back in the day when that plow was new were a whole lot higher but your cylinder may not be original either. Seems more likely it would have been a single acting cylinder on there.

Pull the pin on one end of cylinder,see if it moves without a load.

Pull the pin on one end of cylinder,see if it moves without a load.

Without a diverter valve I don't think it will work unless you either chain the blade up and disconnect the hydraulic cylinder or take the blade off. In my opinion the cylinder with the largest bore will take all of the oil until it is fully extended and then the smaller one should extend.
Chuck C

The blade hoses are disconnected, I have used a plow with the same size cylinder behind my D2 and 4 with no problems, I have 3/4" lines from the diverter valve to the rear of the seat and then 1/2" hoses from there to the cylinder.