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. Gear pump section P3 supplies hydraulic
flowtoboththeliftcontrolmanifoldandthesteeringcon-
trolvalve.Hydraulicflowfromthispumps ectionisdeliv-
ered to the circuits through a proportional flow divider
located in the fan control manifold. Maximum lift/lower
circuitpressureislimitedto1600PSI(110bar)byarelief
valve(R1)intheliftcontrolmanifold.Liftcircuitpressure
canbemonitoredattestfittingG1ontheliftcontrolman-
ifold.
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 gear pump sec-
tionP3bypasses the liftcylindersthroughtheliftcontrol
manifoldsolenoidvalveS5andproportionalreliefvalve
PRV which are de--energized. Return flow from the
manifoldis routed to the oil filter and traction charge cir-
cuit.
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) c utting decks on a Groundsmaster
4500--D, the rear of the lift switch is depressed. The
switchactsasaninputtotheTEC--5002controllerwhich
then provides an electrical output to solenoid valve S5
in the lift control manifold. Energized solenoid valve S5
shiftstoallowapassageforoilflowtotherodendsofthe
centerfive(5) deck liftcylinders.Theoilflow causesthe
liftcylinderstoretractandraisethefive(5)cuttingdecks.
Two (2) orifices in the junction manifold control the rais-
ing speed of the #2 and #3 decks.
When the deck switch is released, solenoid valve S5 is
de--energizedandtheliftcylindersandcuttingdecksare
held in position.
1. Lift switch (#1 to #5)
Figure 14
1
Figure 15
GM--4500 CUTTING DECK LOCATIONS
#4 #1 #5
#3#2
Hydraulic
System
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