Mow Circuit
Hydraulic flow for themow circuit is supplied by twosec-
tions of the gear pump (P1 and P2). Gear pump section
(P1) supplies hydraulic flow to decks 2, 3, and 5 (also 7
on the GM 4700--D), while gear pump section (P2)
supplies decks 1 and 4 (also 6 on the GM 4700--D).
stopping rate of the blade when the solenoid valves are
de--energized as the PTO switch is turned OFF. Decks
#6 and #7 are controlled by solenoid valve (SV2), logic
cartridge (LC2), and brake relief cartridge (RV9).
Returnoilfromthedeckmotorsisdirectedtotheoilcool-
er and oil filter. Deck motor case drain leakage returns
to the hydraulic reservoir.
On the Groundsmaster 4500--D, hydraulic flow from the
two pump sections is controlled by two hydraulic
manifolds each equipped with a solenoid controlled,
proportional relief valve (PRV1/PRV2), logic cartridge
(LC1), and brake relief cartridge (RV8). When the PTO
switch is OFF (or if the decks are raised), the deck sole-
noid valves (PRV1/PRV2) are not energized, allowing
hydraulic flow to by--pass the deck motors through the
manifold. When the PTO switch is turned ON with the
decks lowered, the solenoid valves (PRV1 and PRV2)
energize, causing a shift of the logic cartridges (LC1)
andallowinghydraulicflowtothedeckmotors.Brakere-
lief cartridges (RV8) control the stopping rate of the
bladewhenthesolenoidvalvesarede--energizedasthe
PTO switch is turned OFF.
Maximum mow circuit pressure is limited at each deck
manifold by the proportional relief valve (PRV1 and
PRV2).The deck relief valve pressure is3500 PSI.Mow
circuit pressure can be measured at port (G1) of the
deck control manifold.
#4
Deck
#1 Deck
#5 Deck
On the Groundsmaster 4700--D, hydraulic flow from the
two pump sections is controlled by two hydraulic man-
ifolds each equipped with a solenoid controlled, propor-
tionalrelief valve (PRV1/PRV2),asolenoid valve (SV2),
two logic cartridges (LC1 and LC2), and two brake relief
cartridges (RV8andRV9).Whenthe PTOswitch isOFF
(or if decks are raised), the deck solenoid valves (SV2
and PRV1/PRV2) are not energized, allowing hydraulic
flow to by--pass the deck motors through the manifold.
When the PTO switch is turned ON with the decks low-
ered, the solenoid valves (SV2 and PRV1/PRV2) ener-
gize, causing a shift of the logic cartridges (LC1 and
LC2) and allowing hydraulic flow to the deck motors.
Brake relief cartridges (RV8 and RV9) control the
#
2
#3
Deck
#6 Deck
#7 Deck
(GM4700)
Deck
(GM4700)
CUTTING DECK LOCATIONS
Figure 13
FROM GEAR PUMP (P1)
FROM GEAR PUMP (P2)
GM 4700--D
ALL DECKS LOWERED
PTO SWITCH ON
Figure 14
Page 4 -- 15
Groundsmaster 4500--D/4700--D
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | 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:
Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)