Toro Groundsmaster 4500-D Series Service Manual page 132

Hydraulic System: Hydraulic Flow Diagrams
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 (1600PSI) by a relief
valve (R1) in the lift control manifold. Lift circuit pressure can be monitored at
test fitting G1 in the lift control manifold.
The Groundsmaster 4700-D has three (3) lift switches to control the cutting
decks (Figure 47). The center switch is for the five (5) center decks, the left
switch controls the left, rear deck (#6) and the right switch controls the right, rear
deck (#7) (Figure 48).
When the cutting decks are in a stationary position (not raising or lowering), lift
circuit flow from the third pump section bypasses the lift cylinders through the
lift control manifold solenoid valve S1 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.
g308049
1. Lift switch (#1 to #5)
2. Lift switch (#6)
g308050
Figure 47
3. Lift switch (#7)
#4 #1
#6
#2
#3
Figure 48
GM4700-D Cutting Deck Locations
Page 5–30
#5
#7
Groundsmaster ®
19245SL Rev A
4500-D/4700-D