Multi Pro 5800 Page 7 − 7 ExcelaRate Spray System
ExcelaRate Spray System Operation
The ExcelaRate system controls application rate by in-
creasing/decreasing the hydraulic flow to the spray
pump proportional valve (increasing/decreasing pump
speed and therefore output/pressure) based on input
from:
Operator programming (application rate)
Flow meter
Ground speed
Additional ExcelaRate system information can be found
in the Multi Pro 5800 Operator’s Manual and Software
Guide.
Spray Pump
The ExcelaRate spray system on the Multi Pro 5800 us-
es a positive displacement six (6) diaphragm pump to
move spray solution from the spray tank to the boom
nozzles. The spray pump is self−priming with manually
lubricated bearings and a dry crankcase.
The downward stroke of the pump’s connecting rods
and diaphragms creates suction to allow fluid to be
drawn from the spray tank to the pump via the suction
tube, suction strainer, hoses and connectors. Suction
valves positioned in the pump valve chamber prevent
fluid from being pumped back into the suction line during
the upward stroke of the pump’s connecting rods. Leaks
in the suction line will cause system problems and often
will be indicated by erratic spray, line jumping and ex-
cessive pump noise.
Once to the pump, the fluid is pushed by the upward
stroke of the pump’s connecting rods and diaphragms
to the pressure side of the spray system. Pressure
valves positioned in the pump head prevent fluid from
being drawn back into the pump during the downward
stroke of the pump’s connecting rods. Maximum pres-
sure in the system is limited by a pressure relief valve lo-
cated near the pump. If spray system pressure exceeds
218 psi (15 Bar), spray product is directed back to the
suction side of the spray pump. A pressure transducer
in the system provides spray pressure information to the
TEC and for the InfoCenter display. An analog pressure
gauge is also located on the dash panel to indicate spray
system pressure.
System Controls
Battery current for spray system fuses, switches, valve
actuators and other electrical components is provided
by the main relay when the machine ignition switch is in
the RUN position. For spray system electrical compo-
nent information and circuitry, see Chapter 6 − Electrical
System and Chapter 11 − Foldout Drawings in this man-
ual.
The spray system is configured and spray application is
monitored through the InfoCenter display. The spray
system is operated by a variety of electrical switches lo-
cated on the dash and control console. Switches include
a spray mode switch, spray pump enable switch, an ap-
plication rate (increase/decrease) switch, an agitation
control switch, three (3) boom section control switches
and two (2) boom lift switches. These switches control
the desired mode of spray system operation, control the
spray pump hydraulic proportional valve, the agitation
control valve, three (3) boom control valves and the hy-
draulic boom lift solenoid coils. Additionally, a master
boom switch allows the operator to turn ON/OFF all ac-
tive boom sections with one touch.
The spray pump is directly coupled to and driven by a hy-
draulic motor. Flow from the hydraulic system gear
pump to the motor is controlled by a series of valves in
the pump control manifold. Based on available current
(mA) from the Toro Electronic Controller (TEC), the hy-
draulic proportional valve (PV) controls hydraulic flow to
the spray pump motor. This hydraulic flow causes the
motor to rotate the spray pump for spray system opera-
tion. A logic cartridge (LC) and a relief valve (RV) located
in the pump control manifold help maintain consistent
and safe operating pressure. See Hydraulic Flow Cir-
cuits − Spray Pump Drive Circuit in Chapter 5 − Hy-
draulic System in this manual for more detailed
information.
When the spray pump is ON, the switch light is illuminat-
ed, the spray pump icon appears on the InfoCenter dis-
play and the application rate (increase/decrease) switch
allows the operator to adjust the electrical current to the
hydraulic proportional valve solenoid coil. Higher cur-
rent (rate increase) to the solenoid coil increases hy-
draulic flow to the spray pump motor and results in a
higher spray pump speed and more output/pressure.
Lower current (rate decrease) to the solenoid coil de-
creases hydraulic flow to the spray pump motor and re-
sults in a lower spray pump speed and less
output/pressure. The spray nozzles achieve their rated
output at 40 psi (2.8 bar) unless otherwise stated. The
application rate and nozzle selected will dictate the ex-
act pressure. See the Spray Nozzle Selection Guide
(Toro12−082−T) for information regarding spray nozzle
selection.
ExcelaRate
Spray System
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