A slow moving plow usally is frozen water in the pump, best way to handle that in a pinch is to get a drop light and a blanket put the light aginst the pump cover with blanket and let it warm up, after some time give it a try and if all works as should just go do your plowing just keep the blade moving left to right while up that should keep the water from refreezing,,,,,,,,,,, afetr the storm change fluid adding an ounce of dry gas if its a Meyer, if a fisher just take the motor off and wipe out any water.....