Mow Circuit
Hydraulic flow for the mow circuit is supplied by two (2)
sections of the gear pump (P1 and P2). Gear pump sec-
tion P1 supplies hydraulic flow to decks 5, 3 and 2 (also
deck 7 on the GM 4700--D), while gear pump section P2
supplies decks1and4(alsodeck6ontheGM4700--D).
#4 Deck
#1 Deck
#5 Deck
A single deck control manifold is used to control flow
from the two (2) pump sections. The manifold includes
cartridge valves for control of each of the two (2) pump
circuits. Each manifold circuit is equipped with a sole-
noid controlled, proportional relief valve (PRV1/PRV2),
a logic cartridge (LC1/LC2) and a brake relief cartridge
(RV8/RV9).TheGroundsmaster 4700--Ddeck manifold
includes additional cartridges to control hydraulic flow
for decks 6 and 7: an additional logic cartridge
(LC3/LC4),asolenoidvalve(SV1/SV2)andanaddition-
al brake relief cartridge (RV10/RV11).
#2
Deck
#3
Deck
#
6 Deck
#7 Deck
(GM4700)
(GM4700)
CUTTING DECK LOCATIONS
PTO Disengaged
Figure 18
When the PTOswitch isOFF (orifthedecks areraised),
the manifold solenoid valves (PRV1 and PRV2) are not
energized, allowing hydraulic flow to bypass the deck
motors through the manifold. Return oil from the man-
ifolds is directed to the oil cooler and oil filter.
DECK CONTROL MANIFOLD
(Groundsmaster 4700--D)
FROM
DECK 7
PTO Engaged
When the PTO switch is turned ON with the decks low-
ered, the solenoid valves (PRV1 and PRV2) are ener-
gized with outputs from the TEC--5002 controller. The
energized valves shift to direct pump flow toward the
deck motors. As circuit pressure to the deck motors in-
creases, the brake relief cartridge (RV) opens which al-
lows an oil flow through the manifold orifice positioned
before the logic cartridge (LC). This flow creates a pres-
sureincrease atthelogic cartridge that willshift thelogic
cartridge and allow oil return from the deck motors.
TO DECK
7
FROM
DECKS
2, 3 & 5
FROM
PUMP P1
TO DECKS
2,
3 & 5
FROM
DECK 6
TO DECK
6
On the Groundsmaster 4700--D (Fig. 19), if deck 6 or
deck 7 is lowered and the PTO switch is ON, the deck
control manifold solenoid valve (SV1/SV2) will be ener-
gized by the TEC--5001 controller. This energized sole-
noid valve allows oil flow to the appropriate deck motor
as described above.
FROM
DECKS
1
& 4
FROM
PUMP P2
TO DECKS
1 & 4
TO OIL
COOLER
Maximum mow circuit pressure is limited at each deck
manifold circuit by the proportional relief valve
(PRV1/PRV2). The deck relief valve pressure is 3500
PSI (241 bar). Mow circuit pressure can be measured at
port G1 or G3 of the deck control manifold.
PTO SWITCH ON AND
(RH) DECK RAISED
#7
Figure 19
Thebrakereliefandlogiccartridgescontrolthestopping
rate of the blades when the solenoid valves are de--en-
ergized as the PTO switch is turned OFF or if the decks
are raised (see Cutting Deck Blade Braking in this sec-
tion).
Groundsmaster 4500--D/4700--D
Page 4 -- 25
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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