Toro Reelmaster 5100-D, Руководство по обслуживанию

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Hydraulic Flow Diagrams
Traction Forward
The hydrostatic transmission is driven by a drive shaft
off the front of the engine crankshaft. Pushing the top of
the traction pedal, rotates the variable displacement
pump swash plate to create a flow of oil. This oil is
directed to the fixed displacement motor which turns the
differential input shaft to drive the front wheels. Operat­
ing pressure on the high pressure side of the closed loop
is determined by the amount of load developed at the
fixed displacement motor. As the load increases, pres­
sure can increase to a maximum of 2750 PSI (3200 PSI
if equipped with 4WD). Main system pressure is limited
by a high pressure relief valve on each side of the closed
loop circuit. System pressure can be measured at test
ports on the transmission. If pressure exceeds the relief
setting, oil flows through the relief valve to the low
pressure side of the closed loop circuit. An integral charge pump provides a constant supply of
charge oil to the variable displacement pump and closed
loop circuit for lubrication and to make up for oil that is
lost due to internal leakage in the pump and motor.
Charge pump flow is directed through the oil cooler, then
through the filter to the low pressure side of the closed
loop circuit. A cooler bypass valve and filter bypass
valve allow charge oil flow to the closed loop if the cooler
or filter becomes plugged. Charge pressure is limited to
150 PSI by a relief valve. Charge pressure can be
monitored at the charge pump test port.
Oi l
Screen
Filter
l
Pump
Hi
lief
Reli
Pump
ir
High Pressure
Charge Pressure
Reservoir
Oil Flow
l Coo er
Hydrostatic Transmission
Input Shaft Output Shaft
Variab e Disp.
Cooler
Bypass
Filter Bypass
gh Press.
Re
High
Pres s.
Relief
Charge
ef
Charge Check
Charge
Check
Charge
Fixed Disp.
Motor
Reservo
Figure 9
Reelmaster
®
5100-D Page 4 - 7 Hydraulic Flow Diagrams