Elevation Control And Stop Pin; Automatic Drain - Task Force Tips CROSSFIRE Manual

A sliding monitor can cause injury. When used on a portable base, keep the horizontal angle
WARNING
between the water stream and the anchor strap as small as possible. At large angles the base can
slide in an arc around the anchor point.

4.5 ELEVATION CONTROL AND STOP PIN

When a nozzle is flowing water the reaction force acts in a straight line that
is directly opposite the water flowing out the end of the nozzle. If a nozzle on
a monitor on a portable base is pointed straight up, all of the reaction force is
directed straight down and there is no sideways force that can cause the base
to slide. As the nozzle is angled downward at the same flow, the reaction force
remains the same, but some of that force becomes a force acting sideways and
some acts in a downward direction. When the nozzle is at an angle of 45° the
force acting sideways is equal to the force acting downward on the base. As the
elevation angle of the nozzle is lowered the sideways force increases while the
downward force decreases. At an angle of 35°, (the angle at the elevation safety
stop), approximately 82% of the nozzle reaction force is acting sideways on the
base. When the nozzle is at a zero degree angle, with respect to the base, the
entire reaction force is acting sideways on the base and there is no downward
force at all. The lower the elevation angle of the nozzle, with respect to the base,
the greater the force that causes sliding, and the more likely sliding will occur.
Figure 4.5.1
Elevation control
DANGER
When mounted on a truck base, the nozzle may be lowered below the 35° safety stop by pulling out the stop pin and rotating the
handwheel below the 35° stop. When the nozzle is raised back above 35°, the spring loaded stop pin will snap back into position
automatically limiting the elevation of the nozzle with respect to the base to 35°.

4.6 AUTOMATIC DRAIN

An automatic drain empties water from a low point in the monitor piping to prevent freezing and help empty hose lines. The valve is
designed to close automatically when pressure in the monitor exceeds approximately 5 psi and open again when the pressure drops
to that point. When the automatic drain is not desirable it may be disabled. To disable the drain valve refer to the exploded view on
page 16 and follow the steps below:
1) Unscrew the drain assembly (40, 41, 42, & 43) and remove the screw and washer (42 & 43)
2) Flip over the rubber drain valve (41) so that the raised edge is against the face of the housing (40).
3) Reassemble
©Copyright Task Force Tips LLC 1999-2018
Figure 4.4.1
Unlocked
Figure 4.5.2
Elevation stop pin out
Operating on a portable base below this safety stop is DANGEROUS. Injury or death can occur if
the monitor and base slides or lifts off the ground. Do not operate on portable base below safety
stop.
Figure 4.4.2
Locked
Figure 4.5.3
Elevation stop pin in
9
35°
DANGER
Operating On Portable
Base Below This Stop
(pin pulled) Is Dangerous.
XL090
LIX-040 May 30, 2018 Rev10