The P Series Pumps can be combined with wheel motors and other remotely located units. These pumps provide an infinitely variable speed range between zero and full displacement in both forward and reverse modes of operation.
The P Series Pumps are of the axial piston design, utilizing spherical nosed pistons. A compression spring, located inside each piston, holds the nose of the piston against a thrust bearing race.
The variable displacement pump features a cradle swashplate with a direct-proportional displacement control. Movement of the directional control shaft produces a proportional swashplate movement and a change in pump flow and/or direction.
Reversing the direction of the angle of the swashplate reverses the flow of oil from the pump and thus reverses the direction of motor output rotation.
A fixed displacement gerotor charge pump is provided in P Series Pumps. Oil from an external reservoir and filter is pumped into the closed loop by a charge pump. Fluid not required to replenish the closed loop flows either into the pump housing through a cooling orifice, or back to the charge pump inlet through the charge pressure relief valve. Check or shock valves are included in the pump end cap to control the makeup oil flow for the system.