Multi Pro 1200/1250 Page 6 -- 3 Spray System
Spray System Operation
TheMulti Pro1200and 1250spray systemsuseaposi-
tivedisplacementdiaphragmpumptomovespraysolu-
tionfromthe spray tank totheboom nozzles. Thespray
pump is self--priming and has a dry crankcase. The
pump is driven by the pump drive gearbox output shaft
ataspeedthatisproportionaltothegroundspeedofthe
vehicle. The pump is engaged with an electric clutch.
The downward stroke of the pump’s connecting rods
anddiaphragmscreatesuctiontoallowfluidtobedrawn
from the spray tank to the pump through the suction
tube, suction strainer, hoses and connectors. A suction
dampener placed in the suction line dampens suction
pulsestosmoothsuctionflow.Suctionvalvespositioned
in the pump valve chamber prevent fluid from being
pumped back into the suction line when the connecting
rods change direction. Leaks in the suction line will
causesystemproblemsandoftenwillbeindicatedbyer-
ratic suction line jumping and pump noise.
Once to the pump, the fluid is pushed by the upward
stroke of the pump’s connecting rods and diaphragms
tothe pressuresideof thespraysystem throughhoses,
connectors, control valves and spray nozzles. A pres-
sure dampener at the pump outlet smooths system
pressure pulsation. Pressure valves positioned in the
pumphead preventfluid frombeing drawnback intothe
pump. Maximum pressure in the system is limited by a
pressure relief valve located in the tank. A pressure
gauge indicates system pressure.
Flow for tank agitation on both the Multi Pro 1200 and
1250 comes from flow that is bypassed by the pressure
control valve. A manual agitation control valve directs
flow to ten (10) agitation nozzles in the spray tank.
Batterycurrent forspray systemfuses,switches,r elays
andothercomponents is providedbythe accessory so-
lenoid when the machine ignition switch is in the RUN
position. For spray system electrical component infor-
mation and test procedures, see Chapter 5 -- Electrical
System.
Multi Pro 1200 Spray Control
ThespraycontrolsystemontheMultiPro1200consists
ofamainon/offvalve,apressurecontrolvalveandthree
(3) manual boom control valves. An adjustable boom
bypass v alve exists in each of the boom control valves
toprevent systempressure changeswhenaboomsec-
tion is shut off. Flow in excess of control valve settings
is directed back to the spray tankor used for tank agita-
tion.
Aninlineflowmeterinthepressuresideofthesystemdi-
rectly before the boom control valves measures flow to
thespray booms. The Spray Pro Monitor displays infor-
mation regarding application rate based on input from
the flowmeter and the transaxle speed sensor.
NOTE: On the Multi Pro 1200, make sure that all boom
valves are on when calibrating the Spray Pro Monitor.
The Multi Pro 1200 monitor cannot accurately display
calibrationvolume whenanyof theboom valvesareoff.
Multi Pro 1250 Spray Control
The spray system on the Multi Pro 1250 is controlled
electrically and consists of a main control valve and
three (3) boom control valves. An adjustable boom by-
pass valve exists in each of the boom control valves to
preventsystempressurechangeswhenaboomsection
is shut off.Flow in excess of control valve settings is di-
rected back to the spray tank or used for tank agitation.
Aninlineflowmeterinthepressuresideofthesystemdi-
rectly before the boom control valves measures flow to
thespray booms. The Spray Pro Monitor displays infor-
mation regarding application rate based on input from
the flowmeter and the transaxle speed sensor.
Spray
System
To Next Page
Loading...
