Toro Groundsmaster 4100-D Service Manual page 55

Raise 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 raised indepen-
dently with the use of three (3) switches on the armrest
console. Pressing the rear of a switch provides an input
for the TEC--5001 controller to raise the cutting deck or
wing deck. The controller provides electrical outputs to
solenoids in the lift/lower manifold to allow appropriate
valve shift to cause the cutting deck or wing deck to
raise.
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 is then available for the traction charge circuit.
NOTE: To raise the cutting deck or wing decks, the op-
erator must be in the operator seat.
Raise Cutting Deck
To raise the cutting deck, the rear 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 valves S1 and S5 in the lift/lower manifold.
The energized solenoid valves shift to allow a passage
for circuit oil flow to the rod end of the deck lift cylinders.
Shifted S1 prevents oil flow from bypassing the lift cylin-
ders. Shifted S5 allows an oil path to the rod end of the
front lift cylinders causing the lift cylinders to retract and
raise the cutting deck. An orifice in manifold port C2
(.035) exists to control the raise speed of the cutting
deck. Oil from the barrel end of the retracting cylinders
returns to the hydraulic reservoir.
When the deck switch is released, the manifold sole-
noids are de--energized and the deck lift cylinders and
cutting deck are held in position.
Groundsmaster 4100--D/4110--D
Raise Right Wing Cutting Deck
To raise the right wing deck, the rear of the right console
switch is depressed as an input to the TEC--5001 con-
troller. The controller provides an electrical output to so-
lenoid valves S1 and S7 in the lift/lower manifold. The
energized solenoid valves shift to allow a passage for
circuit oil flow to the barrel end of the right wing deck lift
cylinder. Shifted S1 prevents oil flow from bypassing the
lift cylinders. Shifted S7 allows an oil path through the
orifice in manifold port C6 and to the barrel end of the
right lift cylinder to extend the lift cylinder and raise the
right wing deck. Oil from the extending cylinder is di-
rected through S8 (de--energized), 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.
Raise Left Wing Cutting Deck
To raise the left wing deck, the rear of the left console
switch is depressed as an input to the TEC--5001 con-
troller. The controller provides an electrical output to so-
lenoid valves S1 and S2 in the lift/lower manifold. The
energized solenoid valves shift to allow a passage for
circuit oil flow to the barrel end of the left wing deck lift
cylinder. Shifted S1 prevents oil flow from bypassing the
lift cylinders. Shifted S2 allows an oil path through the
orifice in manifold port C4 and to the barrel end of the left
lift cylinder to extend the lift cylinder and raise the left
wing deck. Oil from the extending cylinder is directed
through S3 (de--energized), out manifold port CH,
through the oil filter and then to the traction charge cir-
cuit.
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.
Page 4 - - 17 Rev. A Hydraulic System