Lower Cutting Deck - Toro Groundsmaster 4100-D Service Manual

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.
Hydraulic flow from this pump section is delivered to the
two circuits through a proportional flow 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.
A relief valve (RV1) located in the lift/lower manifold lim-
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
deck or wing deck. The controller provides electrical out-
puts to solenoids in the lift/lower manifold to allow ap-
propriate manifold valve shift to cause the cutting deck
or wing deck to lower.
When the cutting deck is in a stationary position, all sole-
noids in the lift/lower manifold are de--energized. 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 wing decks, the op-
erator must be in the operator seat and the traction
speed must be in the Low speed (4WD) position.
Lower Cutting Deck
To lower the cutting deck, the front of the center console
switch is depressed. The switch signal is an input to the
TEC--5001 controller which provides an electrical output
to solenoid valve S6 in the lift/lower manifold. 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-
ders flows through an orifice in the fitting at manifold port
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 filter and is then
available for the traction charge circuit.
When the center deck switch is released, solenoid S6 is
de--energized and the lift cylinders and cutting deck are
held in position.
Groundsmaster 4100--D/4110--D
Lower Right Wing Cutting Deck
To lower the right wing deck, the front of the right console
switch is pushed as an input to the TEC--5001 controller.
The controller provides an electrical output to solenoid
valves S1, S8 and S9 in the lift/lower manifold. The ener-
gized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the right wing deck lift cylinder.
Shifted S1 prevents oil flow from bypassing the lift cylin-
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
through the orifice in manifold port C6 to control the drop
speed of the wing deck. Flow is then directed through
the shifted S9, valve RV2, out manifold port CH, 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
wing deck are held in position.
Lower Left Wing Cutting Deck
To lower the left wing deck, the front of the left console
switch is pushed as an input to the TEC--5001 controller.
The controller provides an electrical output to solenoid
valves S1, S3 and S4 in the lift/lower manifold. The ener-
gized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the left wing deck lift cylinder.
Shifted S1 prevents oil flow from bypassing the lift cylin-
ders. Shifted S3 allows an oil path to the rod end of the
left lift cylinder to retract the lift cylinder and lower the left
wing deck. Oil from the retracting cylinder flows through
the orifice in manifold port C4 to control the drop speed
of the wing deck. Flow is then directed through the
shifted S4, valve RV2, out manifold port CH, 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 left wing
deck are held in position.
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 deck)
and S9 (right wing deck) are energized when the deck
is fully lowered. These energized solenoids provide an
oil passage to and from the lift cylinders to allow cylinder
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 switch is moved from OFF to RUN, the deck
will not be in float until the deck lift/lower switches are
momentarily pressed to lower.
Page 4 - - 15 Rev. A Hydraulic System