Mow Circuit
Hydraulic flow for themow circuit is supplied by twosec-
tions 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 sup-
plies the center deck.
TO DECK
MOTOR
PUMP FLOW
Each cutting deck is controlled by a hydraulic manifold
equipped with a solenoid control valve (SV1), bypass
cartridge (BY1), brake cartridge (BR1), and relief car-
tridge (R1BR). When the the deck solenoid valve (SV1)
is not energized (PTO switch OFF), hydraulic flow by--
passes the deck motor through the bypass cartridge
(BY1). When the PTO switch is turned ON, the solenoid
valve (SV1) energizes, causing a shift of the by--pass
cartridge (BY1) and allowing hydraulic flow to the deck
motor. Brake cartridge (BR1) and relief cartridge
(R1BR) control the stopping rate of the blade when the
solenoid control valve is de--energized as the PTO
switch is turned OFF.
FROM DECK
MOTOR
RETURN
Figure 9
TO DECK
MOTOR
Thesolenoidvalve(SV1)foreachwingdeckisde--ener-
gized any time the wing deck is raised.
PUMP FLOW
Returnoilfromthedeckmotorsisdirectedtotheoilcool-
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 (R1BY) in the hydraulic manifold. The
center and left wing deck relief valves are set at 3000
PSI and the right wing deck relief valve is set at 2000
PSI.
FROM DECK
MOTOR
RETURN
Circuit pressure can be measured at port (G) of the hy-
draulic manifold for each cutting deck.
Figure 10
Cutting Deck Blade Braking
When the operator turns the cutting deck OFF, solenoid
valve (SV1) is de--energized causing logic cartridge
(BY1) to shift (Fig. 9). This shifted valve allows oil return
totheoilcoolerandgearpump.Hydraulicpressureisre-
ducedtothecuttingdeckmotorwhichbeginstoslowthe
cutting blades and also causes logic cartridge (BR1) to
shift (Fig. 10).
TO DECK
MOTOR
PUMP FLOW
FROM DECK
MOTOR
The inertia of the rotating cutting blades increases pres-
sure of the oil return to the deck control manifold. This
pressure increase, along with the shifted logic cartridge
(BR1), causes relief valve (R1BR) to shift, which bleeds
the residual pressure in the circuit and allows the blades
to stop in a controlled manner (Fig. 11).
RETURN
Figure 11
Groundsmaster 4100--D
Page 4 -- 15 Rev. E
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4100 D |
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