We recently purchased a 1988 GMC Pickup with a Fisher Speedcast Plow on it. When the truck is started and on high idle the plow lifts and turns reasonably well. When the truck cuts down to low idle the piston will start to raise until it meets the resistance of the plow and stops. It does the same thing if the plow is sitting on the ground and you try to turn it side to side. When you rev up the motor, then it will raise up and turn. This doesn't seem to work well when trying to plow and raise the plow at the same time. Do you have any input on what may be wrong? Pump? Controls?
Thanks, Ron
Thanks, Ron