Mow Circuit - Toro Groundsmaster 4700-D Service Manual
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Also See for Groundsmaster 4700-D:
- Operator's manual (52 pages) ,
- Installation instructions manual (20 pages) ,
- Service manual (474 pages)
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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 decks 1 and 4 (also deck 6 on the GM 4700--D).
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). The Groundsmaster 4700--D deck manifold
includes additional cartridges to control hydraulic flow
for decks 6 and 7: an additional logic cartridge
(LC3/LC4), a solenoid valve (SV1/SV2) and an addition-
al brake relief cartridge (RV10/RV11).
PTO Disengaged
When the PTO switch is OFF (or if the decks are raised),
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.
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-
sure increase at the logic cartridge that will shift the logic
cartridge and allow oil return from the deck motors.
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.
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.
The brake relief and logic cartridges control the stopping
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
#4 Deck
#6 Deck
(GM4700)
CUTTING DECK LOCATIONS
DECK CONTROL MANIFOLD
(Groundsmaster 4700- -D)
FROM
DECK 7
TO DECK
7
FROM
DECKS
2, 3 & 5
TO DECKS
2, 3 & 5
FROM
DECK 6
TO DECK
6
FROM
DECKS
1 & 4
TO DECKS
1 & 4
PTO SWITCH ON AND
#7 (RH) DECK RAISED
Page 4 - - 25
#1 Deck
#5 Deck
#2
#3
#7 Deck
Deck
Deck
(GM4700)
Figure 18
TO OIL
COOLER
Figure 19
Hydraulic System
FROM
PUMP P1
FROM
PUMP P2
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