Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
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Hydraulic Flow Circuits<br />
Traction Circuit<br />
The traction circuit piston pump is a variable displacement<br />
pump that is directly coupled to the engine flywheel.<br />
Pushing the top of the traction pedal rotates the<br />
pump swash plate to create a flow of oil for forward machine<br />
movement. Pushing the bottom of the traction<br />
pedal rotates the pump swash plate to cause oil flow for<br />
reverse machine movement. This oil is directed to the<br />
rear wheel motors. Operating pressure on the high pressure<br />
side of the closed traction circuit loop is determined<br />
by the amount of load developed at the fixed displacement<br />
wheel motors. As the load increases, circuit pressure<br />
can increase to relief valve settings: 4000 PSI in<br />
either forward or reverse. If pressure exceeds the relief<br />
setting, oil flows through the relief valve to the low pressure<br />
side of the closed loop circuit.<br />
Traction circuit pressure (forward or reverse) can be<br />
measured by installing a tee fitting and gauge into the<br />
traction system hydraulic lines.<br />
The piston (traction) pump and wheel motors use a<br />
small amount of hydraulic oil for internal lubrication. Oil<br />
is designed to leak across pump and motor parts into the<br />
case drain. This leakage results in the loss of hydraulic<br />
oil from the closed loop traction circuit that must be replaced.<br />
The piston (traction) pump incorporates a charge pump<br />
that provides make–up oil for the traction circuit. This<br />
gerotor gear pump is driven by the piston pump drive<br />
shaft. It provides a constant supply of charge oil to the<br />
traction circuit to make up for oil that is lost due to internal<br />
leakage in the piston pump and wheel motors.<br />
Charge pump flow is directed through the oil filter and to<br />
the low pressure side of the closed loop traction circuit.<br />
Pressure in the charge circuit is limited by a relief valve<br />
located in the charge plate adapter on the rear of the piston<br />
pump. Charge pump pressure can be measured at<br />
the auxiliary test port on the side of the piston pump.<br />
Hydraulic<br />
System<br />
<strong>Multi</strong> <strong>Pro</strong> <strong>5700</strong>–D Page 4 – 9 Hydraulic System