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-
trol valve. Hydraulic flow from this pump section is deliv-
ered to the circuits through a proportional flow divider
located in the fan control manifold. Maximum lift/lower
circuitpressureislimitedto1600PSI(110bar)byarelief
valve (R1) inthe liftcontrol manifold. Lift circuit pressure
canbemonitored attestfittingG1ontheliftcontrolman-
ifold.
1
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).
Figure 14
Lift switch (#1 to #5)
1.
When the cutting decks are in a stationary position (not
raising or lowering), lift circuit flow from gear pump sec-
tion P3 bypasses the lift cylinders through the lift control
manifold solenoid valve S5 and proportional relief valve
PRV which are de--energized. Return flow from the
manifold is routed to the oil filter and traction charge cir-
cuit.
#4
#1
#5
#
2
#3
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
GM--4500 CUTTING DECK LOCATIONS
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
center five (5) deck lift cylinders. The oil flow causes the
liftcylinderstoretractandraisethefive(5)cuttingdecks.
Two (2) orifices in the junction manifold control the rais-
ing speed of the #2 and #3 decks.
Figure 15
When the deck switch is released, solenoid valve S5 is
de--energizedandtheliftcylindersandcuttingdecksare
held in position.
Groundsmaster 4500--D/4700--D
Page 4 -- 21
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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