Toro Groundsmaster 4500-D Series Service Manual page 135

PTO Disengaged
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Hydraulic flow for the mow circuit is supplied by the first two (2) sections of the
gear pump. The first gear pump section P1 supplies hydraulic flow to decks 5,
3 and 2 (also deck 7 on the GM 4700-D), while the second gear pump section
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 solenoid controlled,
proportional relief valve (PRV1/PRV2), a logic cartridge (LC1/LC2) and a brake
relief cartridge (RV8/RV09). 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 additional brake
relief cartridge (RV10/RV11).
g308050
When the PTO switch is OFF (or if the decks are raised), the deck control
manifold solenoid valves (PRV1 and PRV2) are not energized, allowing hydraulic
flow to bypass the deck motors through the manifold. Return oil from the
manifolds is routed to the oil cooler and oil filter.
#4 #1 #5
#6
#2
#3
Figure 50
GM4700-D Cutting Deck Locations
Page 5–33 Hydraulic System: Hydraulic Flow Diagrams
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