Spray System Operation - Toro Multi Pro 5800 Service Manual

Spray System Operation

The Multi Pro 5800 spray system uses a positive dis-
placement six (6) diaphragm pump to move spray solu-
tion from the spray tank to the boom nozzles. The spray
pump is self--priming and has 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.
Leaks in the suction line will cause system problems and
often will be indicated by erratic suction line jumping and
excessive 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 through hoses,
connectors, control valves and spray nozzles. Pressure
valves positioned in the pump head prevent fluid from
being drawn back into the pump. Maximum pressure in
the system is limited by a pressure relief valve located
near the pump. A pressure gauge on the dash panel in-
dicates spray system pressure.
Battery current for spray system fuses, switches, valve
motors and other electrical components is provided by
the main relay when the machine ignition switch is in the
RUN position. For spray system electrical component
information, see Chapter 5 -- Electrical System.
The machine operator controls the spray system on the
Multi Pro 5800 with electrical switches located on the
dash and spray console. Switches include a spray pump
on/off switch, an application rate (increase/decrease)
switch, an agitation control switch, three (3) boom con-
trol switches and two (2) boom lift switches. These
switches control the agitation control valve, three (3)
boom control valves, the hydraulic manifold pressure
compensator valve solenoid coil and the hydraulic boom
lift solenoid coils. Additionally, a master (foot) boom
valve switch allows the operator to turn off/on all three
(3) boom sections.
The spray pump is directly coupled to and driven by a hy-
draulic motor. Flow from the hydraulic gear pump to the
motor is controlled by the hydraulic pump control man-
ifold. Based on available current (mA) from the applica-
tion rate (increase/decrease) switch, the manifold
pressure compensator valve controls gear pump flow to
the spray pump hydraulic motor. This hydraulic flow
causes the motor to rotate the spray system pump for
spray system operation.
Multi Pro 5800
When the spray pump is ON, the switch light is illumi-
nated and the application rate (increase/decrease)
switch allows the operator to adjust electrical current to
the manifold pressure compensator valve solenoid coil.
Higher current (rate increase) to the solenoid coil in-
creases hydraulic flow to the spray pump motor and re-
sults in a higher spray pump speed with more
output/pressure. Lower current (rate decrease) to the
solenoid coil decreases hydraulic flow to the spray
pump motor and results in a lower spray pump speed
with less output/pressure. Desired spray pump pressure
should be based on boom nozzle selection and ground
speed. See the Nozzle Selection Guide (Toro Form No.
3351--389) for information regarding boom nozzle
selection.
When the agitation switch is ON, the switch light is illumi-
nated and the agitation control valve is opened. This
open valve directs system flow to four (4) agitation
nozzles in the spray tank. When the agitation switch is
OFF, the agitation control valve is closed so no flow is
directed to the tank agitation nozzles.
When a boom control switch (left, center or right) is ON,
the switch light is illuminated and the boom control valve
for that boom is opened. This open valve directs system
flow to the spray nozzles located on the boom section.
When a boom control switch is OFF, the boom control
valve is closed so no flow is available to that spray boom.
If the Multi Pro is equipped with the manual interface
control, a manually adjustable boom bypass valve is in-
corporated in each of the boom control valves. Proper
adjustment of the boom bypass valves prevents system
pressure changes when a boom section is shut off. Flow
from the boom bypass valves is directed back to the
spray tank (boom bypass).
An optional Pro Control XP Spray System is available for
the Multi Pro 5800. This system includes a dash
mounted computer and an inline flowmeter to control the
spray system. The flowmeter is positioned in the pres-
sure side of the spray system directly before the boom
control valves. The flowmeter measures spray boom
flow. The Pro Control computer determines system ap-
plication rate based on operator programming and in-
puts from the flowmeter and the ground speed sensor
located in the right rear wheel motor. Additional Pro Con-
trol information can be found in the Pro Control XP Spray
System Operator's Manual.
Page 6 - - 5 Spray System