The hydrostatic pump is composed of two hydrostatic piston pumps connected together. The pumps provide bidirectional flow to two separate hydrostatic drive motors.
The pump flow and direction are controlled by two hand levers, one for each pump.
The hydrostatic pump contains replenishing valves. The function of these valves is to give replacement fluid to the low pressure side of the hydrostatic circuit. Replacement fluid is needed because of normal internal leakage and the controlled flow to the oil cooler for cooling. Another function of the replenishing valve is to keep high pressure fluid out of the low pressure side of the hydrostatic circuit.
The hydrostatic pump contains the charge pressure relief. The charge pressure relief is adjustable with shims.
The hydrostatic pump is located in the center of the mainframe mounted to the engine flywheel housing.