Lift/Lower Circuit: Lower - Toro Groundsmaster 360 Service Manual

Lift/Lower Circuit: Lower

Cutting Deck Float
Hydraulic System: Hydraulic Flow Diagrams
A single-section gear pump is directly coupled to the transmission which is driven
by the engine. This gear pump supplies hydraulic flow for both the steering and
lift/lower circuits. The gear pump flow is routed to the steering control valve
first so that the steering circuit has priority. The pump takes its suction from
the hydraulic tank.
When the deck lift switch is in its neutral state, flow from the gear pump bypasses
the lift cylinder and is routed through the deck lift manifold directly to the oil
cooler and then to the transmission. The transmission case drain allows the
hydraulic fluid to return to the hydraulic tank.
Note: Ensure that the key switch is in the R
to be lowered. When the front of the deck lift switch is pressed, the deck will
lower fully and enter the float position. The switch has momentary contacts in
the lower position so that the switch returns to the center position after being
pressed to lower the cutting deck.
When the deck lift switch is pressed to the L
in the deck lift manifold is energized to cause the valve to shift. The energized
solenoid valve S1 allows a path for fluid flow from the barrel end of the lift
cylinder. The weight of the cutting deck causes the lift cylinder to retract, allowing
the cutting deck to lower to the ground. An orifice fitting in the deck lift manifold
controls the speed of the lift cylinder while lowering the cutting deck.
The circuit operation for lowering the cutting deck is similar to raising it. However,
the hydraulic flow is used to retract the lift cylinder and this action allows the
cutting deck to lower.
The cutting deck float allows the fully lowered cutting deck to follow ground
surface contours. On the Groundsmaster 360 machines, the deck lift manifold
solenoid valve S1 stays energized for the deck float when the deck is fully
lowered. This energized solenoid provides an oil passage to and from the lift
cylinder to allow cylinder and cutting deck movement while mowing.
UN
OWER
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position to allow the cutting deck
position, the solenoid valve S1
Groundsmaster 360
16225SL Rev C