jonsstihl
Veteran Member
I need a crash course on cushion valves.
I have a pronovost pxpl 80 snow blower with a blade on the back.
at idle it takes 8 seconds to lower the blade on the extension stroke of the cylinder. It takes 6 seconds to lift the blade on the retract stroke.
the problem I have is when I go to PTO rpm it takes 3 seconds to extend the cylinder and 8 seconds to retract. It should be taking about 2 seconds to retract the cylinder.
it is almost as if the cushion valve in the circuit is turning my spool valve into a regeneration valve.
I have an exploded view of the cushion valve in my owners manual but none of the parts are labeled
I did a few tests with my pressure gauge hooked into the remotes. I only get 1500 psi of pressure in one direction and when I switch the pressure gauge to the other side I get full system pressure approx 2500 psi until the blade hits the stops then it is like something shifts in the valve and then I only get 1500 psi on the same side that I got 2500 psi before hitting the stops.
I think the valve is not adjusted to the same setting on each side but I'm not even sure how to adjust the valve.
thanks
I have a pronovost pxpl 80 snow blower with a blade on the back.
at idle it takes 8 seconds to lower the blade on the extension stroke of the cylinder. It takes 6 seconds to lift the blade on the retract stroke.
the problem I have is when I go to PTO rpm it takes 3 seconds to extend the cylinder and 8 seconds to retract. It should be taking about 2 seconds to retract the cylinder.
it is almost as if the cushion valve in the circuit is turning my spool valve into a regeneration valve.
I have an exploded view of the cushion valve in my owners manual but none of the parts are labeled
I did a few tests with my pressure gauge hooked into the remotes. I only get 1500 psi of pressure in one direction and when I switch the pressure gauge to the other side I get full system pressure approx 2500 psi until the blade hits the stops then it is like something shifts in the valve and then I only get 1500 psi on the same side that I got 2500 psi before hitting the stops.
I think the valve is not adjusted to the same setting on each side but I'm not even sure how to adjust the valve.
thanks