Lift Circuit: Lower - Toro Groundsmaster 360 Service Manual

Lift Circuit: Lower (Fig. 16)
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. Gear pump flow is routed to the steer-
ing control valve first so 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 oil to return to the hydraulic tank.
NOTE: The engine must be running to allow the cutting
deck to be lowered. When the front of the deck lift switch
is depressed, the deck will lower fully and enter the float
position. The switch on 4WD machines has momentary
contacts in the lower position so the switch returns to the
center position after being pressed to lower the cutting
deck. The switch on 2WD machines remains in position
when pressed to lower.
Groundsmaster 360
When the deck lift switch is pressed to the LOWER posi-
tion, solenoid valve A in the deck lift manifold is ener-
gized to cause the valve to shift. Energized solenoid
valve A allows a path for oil 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 at the barrel end of
the lift cylinder controls the retracting speed of the lift cyl-
inder while lowering the cutting deck.
Cutting Deck Float
Cutting deck float allows the fully lowered cutting deck
to follow ground surface contours. On Groundsmaster
360 machines, deck lift manifold solenoid valve A stays
energized for 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.
Page 4 - - 21 Hydraulic System