Toro ProLine H800 Service Manual page 84

Forward Direction (continued)
Hydraulic System: Hydraulic Flow Diagrams
The forward traction pressure is limited to 280 bar (4,061 psi). The fluid flowing
from the motor returns to the variable displacement pump and is continuously
pumped through the closed loop circuit as long as the traction pedal is pressed.
The piston pump is equipped with a case drain to allow normal internal leakage
to be removed.
The hydraulic pump also includes a gerotor charge pump. The charge pump
provides a constant supply of pressurized fluid to the closed loop traction circuit
for lubrication and to make up for fluid that is lost due to internal leakage in the
system. The charge pump is fed through a filter from the hydraulic tank. The
charge pump flow is directed to the low pressure side of the closed loop traction
circuit. The charge pressure is limited to 7 bar (101 psi) by a dedicated pressure
relief valve in the hydraulic pump.
Page 5–16 ProLine H800
19241SL Rev A