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After using my rear blade for this Winter cleanup (hope it’s over) I found I spent a lot of time on and off the tractor changing the angle to stop making numerous circles around my egg shaped driveway. I pull it from the sides and use my blower to blow it out of the drive. Really works great as I can be in high gear plowing and Low to blow it off.

I don’t really want to add the expense of remote rear hyd for the tractor and again the added expense for a hyd cylinder for the blade. I was looking at electric actuators that are 12Volt DC and can push/pull up to 100-500 lbs. (various models and strokes are available) As the blade angle change wouldn’t be even close to that. Has anyone done this??

I use one for my blower chute (up and down control) now and it works great, a bit slow, but who cares (.5 inches a sec.) Works to throw the snow low to the ground to stop the wind blowing it back in my face when it can’t make its mind up which direction it wants to blow. (You know the drill)
 

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Although I've never seen it done I assume it would be possible. You would need a very heavy duty actuator with at least 12-14 inches of travel. I'm basing this on the travel on my blade's cylinder. The actual travel will depend on the design of your blade's turn table.
 

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...I was looking at electric actuators that are 12Volt DC and can push/pull up to 100-500 lbs. (various models and strokes are available) As the blade angle change wouldn’t be even close to that.
You are correct in that just changing the angle a the blade does not take much force, but the actuator needs to be be able to hold that blade while using it. I'm no good at math, but imagine how much force the cylinder/actuator sees when the tip of the blade is pushed-especially an mobile object like a rock or curb.
 
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