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Groundsmaster 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 the lift/lower circuit, the engine cooling fan
circuit and the traction charge circuit.
Each of the cutting deck sections (main, right wing and
left wing) can be lowered independently with the use of
three (3) switches on the armrest console. Pressing the
front of a lift switch provides an input for the T EC control-
ler to lower the cutting deck or wing deck. The controller
provides electrical outputs to solenoids in the combina-
tion control manifold to allow appropriate manifold valve
shift that causes a cutting deck to lower.
A relief valve (RV2) located in the combination control
manifold limits lift/lower circuit pressure to 2500 PSI
(172 bar). An adjustable pressure relieving valve (PR)
in the combination manifold maintains 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.
When the lift/lower circuit is not being used (all lift
switches in the neutral position), solenoid valve S1 in the
combination manifold is not energized and gear pump
section oil flow is directed toward the engine cooling fan
motor.
NOTE: To lower a cutting deck, the operator must be in
the operator seat and the traction speed must be in the
LOW speed (mow) position.
Lower Cutting Deck
To lower the cutting deck, the front of the center console
liftswitchisdepressed.Theswitchsignalisaninputto
the TEC controller which p rovides an electrical output to
solenoid valve S6 in the combination manifold. The en-
ergized solenoid valve shifts to allow a passage for oil
flow from the barrel end of the cutting deck lif t cylinders.
The weight of the cutting deck causes the cutting deck
lift cylinders to retract and lower the cutting deck. Check
orifice OR5 (.070) under the manifold fitting in port C2
controls the lowering speed of the cutting deck. Oil from
the retracting cylinders is directed to pressure reducing
valve (PR). As return oil pressure increases, the PR
valve will shift to d irect circuit oil to the oil filter and then
to the traction charge circuit.
Lower Right Wing Deck
Tolowertherightwingdeck,thefrontoftherightconsole
lift switch is pushed as an input to the TEC controller.
The controller provides an electrical output to solenoid
valves S1, S8 and S9 in the combination manifold. The
energized solenoid valves shift to allow a passage for
circuit oil flow to the rod end of the right wing deck lift cyl-
inder. Shifted S1 allows gear pump section oil flow to be
available for the lift/lower circuits. Shifted S8 allows an
oilpathtotherodendoftherightliftcylindertoretract
the lift cylinder and lower the right wing deck. Check ori-
fice OR7 (.070) controls the lowering speed of the wing
deck. Oil from the retracting cylinder is directed through
energized S9, de--energized S7 and then to pressure re-
ducing valve (PR). As return oil pressure increases, the
PR valve will shift to direct circuit oil to the oil filter and
thentothetractionchargecircuit.
Lower Left Wing Deck
To lower the left wing deck, the front of the left console
lift switch is pushed as an input to the TEC controller.
The controller provides an electrical output to solenoid
valves S1, S3 and S4 in the combination manifold. The
energized solenoid valves shift to allow a passage for
circuit oil flow to the left deck lift cylinder rod end. Shifted
S1 allows gear pump section oil flow to be available for
the lift/lower circuits. ShiftedS3allowsanoilpathtothe
rod end of the left lift cylinder to retract the lift cylinder
and lower the left cutting deck. Check orifice OR3 (.070)
controls the lowering speed of the cutting deck. Oil from
the retracting cylinder is directed through energized S4,
de--energized S2 and then to pressure reducing valve
(PR). As return o il pressure increases, the PR valve will
shift to direct circuit oil to the oil filter and then to the trac-
tion charge circuit.
Cutting Deck Float
Cutting deck float allows the fully lowered cutting deck
to follow ground surface contours. Combination man-
ifold solenoid valves S4 (left wing deck), S6 (center
deck) and S9 (right wing deck) are energized when the
deck is fully lowered. These energized solenoids pro-
vide an oil passage to and from the lift cylinders to allow
cylinder and cutting deck movement while mowing.
Counterbalance pressure (PR) will affect deck float op-
eration.
NOTE: If a deck is already fully lowered when the igni-
tion switch is moved from OFF to RUN, the deck will not
be in float until the appropriate deck lift/lower switch is
momentarily pressed to lower.
Hydraulic
System