TANK SHUTOFF VALVE
The tank shut-off valve is for convenience only. It allows you
to work on the plumbing without draining the tank. It should
always be fully open during operation.
AGITATION SHUTOFF VALVE
The agitation shut-off valve is mostly for convenience. It
allows you to work on the plumbing without draining the
tank. It should normally be fully open during operation.
PRESSURE RELIEF VALVE
The pressure relief valve is used to avoid excessive pressure
when the booms are turned off. Start with the “T” handle
screwed mostly out. Slowly bring pump up to operating RPM
(make sure pressure does not go too high). Put the MT-3000
in MAN and turn boom on. Hold adjust switch to “+” for
about 30 seconds to fully close servo valve. Put the MT-3000
in HOLD. Booms should shut off. Now slowly screw handle
in until maximum desired pressure is reached. Lock handle in
place with locking nut or collar.
Note: Spraying Systems 144H DirectoValve has a maximum
pressure rating of 100 PSI (7 bar).
RANGE ADJUST VALVE
The range adjust valve is required when the pump is much
larger than necessary. When the range valve is opened,
some of the liquid will be bypassed around the pump to
avoid “overloading” the rest of the system. The setting of the
range adjust valve is determined by the throttle valve. Start
with the range valve fully closed and perform the Pre-field
System Checkout. If the throttle valve needs to be more than
two thirds closed, open the Range valve slightly and perform
the Pre-field System Checkout again.
THROTTLE VALVE (Bypass Plumbing)
The throttle valve limits your high end to maximize servo
performance. Start with throttle valve fully open and
perform the Pre-field System Checkout.
EXAMPLE
With the throttle fully open and servo fully closed, you
may be able to get 50 GPA at 5 MPH when you only
want 25 GPA. If you were to simply open the servo you
may be able to get down to 25 GPA, but if your speed
should drop to 3 MPH, the servo can’t open any farther
and won’t be able to maintain 25 GPA. Therefore, if you
leave the servo closed and close the throttle until your
high end has dropped from 50 GPA to about 30 GPA, the
servo has a greater operating range.
The throttle valve pictured in the system diagram is a
needle valve (Spraying Systems Type 12690 or 12795).
A ball valve may be used but is more difficult to adjust
and keep adjusted. Do not install a pressure regulator or
relief as a throttle valve.
If the throttle valve is closed too much, PSI may fluctuate
greatly in AUTO.
BOOST SOLENOID VALVE
The Boost Solenoid and Boost Adjust are required to insure
enough bypass when a boom section is turned off.
EXAMPLE
You are finishing up a field on a point row. You have
reduced your speed in anticipation of the fence or other
obstacle ahead. The servo has automatically opened
completely to compensate for the speed change. Now
you turn one boom section off. The pressure would
normally increase and you would over apply because
the servo was already providing maximum bypass. With
the boost installed, the instant you turn a boom off, the
boost valve opened. Provided the boost adjust has been
properly set, the servo does not have to compensate for
a pressure change and your rate will be maintained.
BOOST SOLENOID VALVE ADJUSTMENT PROCEDURE
1. Turn the SPEED TEST SPEED.
2. Flip to MANUAL.
3. Flip to HOLD.
4. Enter TEST SPEED by holding the ADJUST switch to
“+” until display starts increasing.
5. Adjust display to match desired control speed.
6. Turn boom switches on (up).
7. Flip to MANUAL.
8. Turn the SPRAY RATE.
9. Using “+/-” adjust display to show desired SPRAY
RATE.
10. Using boom switches, turn the largest boom off.
11. Adjust BOOST ADJUST valve until display gain
shows your desired SPRAY RATE.
NOTE: When using a boost solenoid valve on sprayers
equipped with two (2) booms, the unused boom (WIDTH =
0) must be turned on (switch up).
33
Plumbing Guidelines (cont.)
Valve Purpose and Adjustments
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