Rev. A
Groundsmaster 4500- D/4700- D Hydraulic SystemPage 4 - 21
Raise Cutting Decks: Groundsmaster 4500- D
A four section gear pump is coupled to the piston (trac-
tion) pump. The third gear pump section supplies hy-
draulic 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. Maxi-
mum lift/lower circuit pressure is limited to 1600 PSI (110
bar) by a relief valve (RV) in the lift control manifold. L ift
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 (Fig. 14).
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 re-
lief 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 or-
der to raise the cutting decks.
Cutting Deck Raise
To raise the five (5) cutting decks on a Groundsmaster
4500- D, the rear of the lift switch is depressed. The
switch acts as an input to the TEC- 5002 controller which
then provides an electrical output to solenoid valve S5
in the lift control manifold. Energized solenoid valve S5
shifts to allow a passage for oil flow to the rod ends of the
five (5) deck lift cylinders. The oil flow causes the lift cyl-
inders to retract and raise all of the cutting decks. The
junction manifold orifice leading to the #1 deck is by-
passed during deck r aising.
Figure 14
1
2
1. Console arm 2. Lift switch
Figure 15
GM- 4500 CUTTING DECK LOCATIONS
#4 #1 #5
#3#2
Hydraulic
System
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