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RapidFire
o le an
The air check nozzles allow for instantaneous
response at the nozzle tip. The lines can be at
spraying pressure and when switched on or off,
the nozzle responds quickly with no dribbling, as
pressure builds up or subsides.
The air checks close under a spring tension of 140
PSI. This traps the liquid in the spray line at the same
pressure that it was being applied. When the booms
are turned on, air pressure acts against the 140 PSI
springs instantly opening flow to the no le allowing
the trapped boom line pressure to apply the liquid
at the rated pressure and droplet size with a full fan
angle.
The air check valve is located on the side of the
nozzle, it has 2 O-rings in it. Over time, the O-ring
may swell or be damaged. This may result in the
nozzle dripping or being slow to shut when it has
been turned off. If the nozzle leaks the outer O-ring
requires replacement. If the air shut off has poor
or delayed response the inner O-ring requires
replacement.
To remove the air check from the nozzle, the air
supply must be removed. Ensure that all the air
pressure is vented from the system. Ensure that all
liquid pressure has been removed from the boom
lines.
To remove the air hose from the check valve, push
down on the release ring on the air fitting and at the
same time, pull the hose.
Unscrew the air check valve from the main body.
Replace the O-rings that are in the air check valve.
Screw the air check valve back onto the main nozzle
body. When re fitting the hose, simply push it into
the fitting.
On dual or uad no le bodies, the body is a fixed
unit and the multi spray nozzle body will need to be
removed from the clamp around the pipe.
See the parts book for more detail.
Prairie Pro Operator's Manual MY19 - REV 2
ir
e
Outer O-ring
Inner O-ring
ir
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Oiler
The air supply to the RapidFire system has a dryer,
oiler and pressure regulator fitted in the circuit.
The dryer removes all the moisture from the air
supply and traps it in a clear bowl. This must be
drained daily to prevent moisture entering the rapid
fire system.
The oil lubricates the air as it passes through to the
RapidFire system. In turn, this lubricates the RapidFire
seals and O-rings. Only a bare minimum amount
of oil is required for the system to function well.
The oiler must be checked weekly and serviced at
approximately 250 hours or when required. The
amount of lubricant drawn into the air supply can be
increased or decreased depending on requirements.
This setting should generally be kept low as excess
oil can clog the breathers in the master air solenoid
valves and prevent them from operating correctly.
The pressure regulator is used to set the maximum
pressure available to the rapid fire system. This
should be set to 80 PSI. The black knob located
above the water trap is used to set the air pressure.
To unlock it, lift the black knob. Looking from above,
turning the knob clockwise will increase pressure.
Turning anti-clockwise will decrease pressure.
To release air from the system for maintenance, turn
the knob anti-clockwise until the pressure on the
gauge reads zero. Drain the water trap to release
any residual pressure.
Once adjustments have been made or maintenance
carried out, reset the pressure as above and push
the black knob down to lock it in place.
Release ring
Check Valve
Continued over page
Chapter 8 - Operation - 59
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