Mow - Toro Groundsmaster 4000-D Service Manual

Mow

Hydraulic flow for the mow circuit is supplied by two sec-
tions of the gear pump. The gear pump section closest
to the piston (traction) pump supplies hydraulic flow to
the side cutting decks, while the next gear pump section
supplies the front cutting deck.
Each cutting deck is controlled by a hydraulic manifold
equipped with a solenoid control valve (S), bypass car-
tridge (LC1), brake cartridge (LC2) and relief cartridge
(RV1). When the the deck solenoid valve (S) is not ener-
gized (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) en-
ergizes, causing a shift of the by--pass cartridge (LC1)
and allowing hydraulic flow to the deck motor. Brake car-
tridge (LC2) and relief cartridge (RV2) control the stop-
ping rate of the blade when the solenoid control valve is
de--energized as the PTO switch is turned OFF.
Groundsmaster 4000--D
Return oil from the deck motors is directed to the oil cool-
er 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 hy-
draulic manifold for each cutting deck.
Page 4 - - 19 Hydraulic System