caution - Toro

Mow Circuit
Hydraulic flow for the mow circuit is supplied by two sections
of the gear pump. The gear pump section closest
to the piston (traction) pump supplies hydraulic flow to
the wing decks, while the next gear pump section supplies
the center deck.
Each cutting deck is controlled by a hydraulic manifold
equipped with a solenoid control valve (S), bypass cartridge
(LC1), brake cartridge (LC2) and relief cartridge
(RV1). When the the deck solenoid valve (S) is not energized
(PTO switch OFF), hydraulic flow by--passes the
deck motor through the bypass cartridge (LC1). When
the PTO switch is turned ON, the solenoid valve (S) energizes,
causing a shift of the by--pass cartridge (LC1)
and allowing hydraulic flow to the deck motor. Brake cartridge
(LC2) and relief cartridge (RV2) control the stopping
rate of the blade when the solenoid control valve is
de--energized as the PTO switch is turned OFF.
The solenoid valve (S) for each wing deck is de--energized
any time the wing deck is raised.
Return oil from the deck motors is directed to the oil cooler
and oil filter. Deck motor case drain leakage returns
to the hydraulic reservoir.
Maximum mow circuit pressure is limited at each deck
by a relief valve (RV1) in the hydraulic manifold. The
front and left deck relief valves are set at 3000 PSI (207
bar) and the right deck relief valve is set at 2000 PSI (137
bar).
Circuit pressure can be measured at port (G) of the hydraulic
manifold for each cutting deck.
Hydraulic
System
Groundsmaster 4100--D
Page 4 - 19
Hydraulic System