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How do I fix the plow pump it wont turn off?

Mm2 pump turns on when move blade with controller, then will not turn off? tries disconnecting all plow solenoids and main solenoid and controller, only stops when disconnect power plug.

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  • Cars & Trucks Master
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I do not know that unit but it sounds like either a leak internal to the hydrulics or a bad pressure switch.

Posted on Dec 14, 2014

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I'm having the same problem.... Did you find the cause?

Posted on Jan 20, 2015

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There is a hydraulic block/valve. Replace it.

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Hydraulic fluid doesn't really freeze. When it does, we wouldn't be around to see it. You need to go threw electrical. Go to there web site and see if you can get a diagram for it. Old systems are fairly easy to go threw. Newer ones have PC boards. Older ones, the stick/switches go bad first. But it always wise to loosen, then tighten the nuts that hold wires first. Corrosion sets in because it isn't used for so long.

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Did you try angling in both directions? If the blade is angled all the way to one side (most likely to the LEFT), it could be that the valves are stuck directing fluid in that specific direction. Check that you are getting power to your "B" solenoid when you are trying to lift the blade, and power to the "C" solenoid when you are trying to angle in one direction but not the other.

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When i try to lift or angle my plow all i get is a clicking sound when i push the lift button and when i let up on the button the moter on the hydrolic unit will click but will not move the plow. minute...


Not familiar with model, but valves click at the same time motor is suppose to run. Check power and ground to motor (or try running it with jumper cables, but don't be where plow can angle and squish you. If good power but won't spin, clean brushes/commutator/check bearings in motor.

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My fisher plow wont move


Sounds like pump is not working, check all fuild lines. Unless the plow is all electric, then the ground

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I just bought a 1986 chevy 1/2 ton with a fisher plow. I hooked up the plow and it won't go up or down, or left or right. The controls work, if I move the pistons on the valve body it still does'nt work....


un bolt the motor from the base, the pickup is just tin, they rot off and fall into the base. you may have valves stuck too, but if nothings moving and pumps running, it should labor BADLY

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