Rev.AGroundsmaster 4100 --D/4110--D Hydraulic SystemPage 4 -- 15
Lower Cutting Deck
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 steering and lift/lower circuits.
Hydraulicflow from this pumpsectionisdelivered to the
two circuits througha proportionalflow divider that is lo-
cated in the fan drive manifold. This flow divider splits
pump flow approximately 50% for the steering circuit
and 50% for the lift/lower circuit.
Areliefvalve (RV1)located in the lift/lowermanifoldlim-
its lift/lower circuit pressure to 1600 PSI (110 bar). An
adjustable valve (RV2) in the lift/lower manifold main-
tains back pressure (counterbalance) on the deck lift
cylinders to allow some of the cutting deck weight to be
transferred to the traction unit to improve traction.
The cutting deck and wing decks can be lowered inde-
pendently with the use of three (3) switches on the arm-
rest console. Pressing the front of a switch provides an
input for the TEC--5001 controller to lower the cutting
deckorwingdeck.Thecontrollerprovideselectricalout-
puts to solenoids in the lift/lower manifold to allow ap-
propriate m anifold valve shift to cause the cutting deck
or wing deck to lower.
Whenthecuttingdeckisinastationaryposition,allsole-
noids in the lift/lower manifold are de-- e nergized. In this
position, lift/lower circuit flow bypasses the lift cylinders
and is directed through the lift/lower manifold, oil filter
and then to the traction charge circuit.
NOTE: To lower the cutting deck or wingdecks, the op-
erator must be in the operator seat and the traction
speed must be in the Low speed (4WD) position.
Lower Cutting Deck
Tolower the cuttingdeck,the front ofthe centerconsole
switch is depressed.The switch signal is an input to the
TEC--5001controllerwhichprovidesanelectricaloutput
tosolenoidvalveS6inthelift/lowermanifold.Energized
solenoid valve S6 shifts to allow a passage for oil flow
from the rod end of the deck lift cylinders. The weight of
the cutting deck causes the deck lift cylinders to extend
and lower the cutting deck. Oil from the extending cylin-
dersflowsthroughanorificeinthefittingatmanifoldport
C2 (.070) to control the drop speed of the cutting deck.
Flow is then directed through the shifted S6, valve RV2,
out manifold port CH, through the oil f ilter and is then
available for the traction charge circuit.
Whenthecenterdeck switch is released,solenoid S6 is
de--energized and the lift cylindersand cutting deck are
held in position.
Lower Right Wing Cutting Deck
Tolowertherightwingdeck,thefrontoftherightconsole
switchispushedasaninputtotheTEC--5001controller.
The controller provides an electrical output to solenoid
valvesS1,S8andS9inthelift/lowermanifold.Theener-
gized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the right wing deck lift cylinder.
ShiftedS1prevents oil flow from bypassingtheliftcylin-
ders. Shifted S8 allows an oil path to the rod end of the
right lift cylinder to retract the lift cylinder and lower the
right wing deck. Oil from the retracting cylinder flows
throughtheorificeinmanifoldportC6tocontrolthedrop
speed of the wing deck. Flow is then directed through
theshiftedS9,valveRV2,outmanifoldportCH,through
the oil filter and then to the traction charge circuit.
When the deck switch is released, the manifold sole -
noids are de--energized and the lift cylinder and right
wingdeckareheldinposition.
Lower Left Wing Cutting Deck
To lower the left wing deck, the front of the left console
switchispushedasaninputtotheTEC--5001controller.
The controller provides an electrical output to solenoid
valvesS1,S3andS4inthelift/lowermanifold.Theener-
gized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the left wing deck lift cylinder.
ShiftedS1prevents oil flow from bypassingtheliftcylin-
ders. Shifted S3 allows an oil path to the rod end of the
leftliftcylindertoretracttheliftcylinderandlowertheleft
wing deck. Oil from the retracting cylinderflows through
the orifice in manifold port C4 to control the drop speed
of the wing deck. Flow is then directed through the
shiftedS4,valveRV2,outmanifoldportCH,throughthe
oil filter and then to the traction charge circuit.
When the deck switch is released, the manifold sole -
noidsarede--energizedandtheliftcylinderandleftwing
deckareheldinposition.
Cutting Deck Float
Cutting deck float allows the fully lowered cutting deck
to follow ground surface contours. Lift/lower manifold
solenoid valves S4 (left wing deck), S6 (cutting dec k)
and S9 (right wing deck) are energized when the deck
is fully lowered. These energized solenoids provide an
oilpassagetoandfromtheliftcylinderstoallowcylinder
and cutting deck movement while mowing. Counterbal-
ance pressure (RV2) will affect deck float operation.
NOTE: If the cutting deck is already fully lowered when
the ignition swit ch is moved from OFF to RUN, the deck
will not be in float until the deck lift/lower switches are
momentarily pressed to lower.
Hydraulic
System
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