Toro Groundsmaster 4500-D Series Service Manual page 129

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
A four section gear pump is coupled to the piston (traction) pump. The third gear
pump section supplies hydraulic flow to both the lift control manifold and the
steering control valve. Hydraulic flow from this pump section is delivered to the
circuits through a proportional flow divider located in the fan control manifold.
Maximum lift/ lower circuit pressure is limited to 110 bar (1600 PSI) by a relief
valve (RV) in the lift control manifold. Lift circuit pressure can be monitored at
test fitting G1 on the lift control manifold.
On the Groundsmaster 4500-D, a single lift switch on the console arm is used to
raise and lower the five (5) cutting decks
When the cutting decks are in a stationary position (not raising or lowering), lift
circuit flow from the third gear pump section bypasses the lift cylinders through
the lift control manifold solenoid valve S5 and proportional relief valve TS which
are de- energized. Return flow from the manifold is routed to the oil filter and
traction charge circuit.
Note: The operator must be in the operator seat in order to raise the cutting
decks.
g308047
1. Console arm
g308048
(Figure
Figure 44
2. Lift switch
#4 #1
#2 #3
Figure 45
GM4500-D Cutting Deck Locations
Page 5–27 Hydraulic System: Hydraulic Flow Diagrams
44).
#5