Operator`s manual

5.6 WATER TOWER NOZZLE ASSEMBLY HYDRAULICS
The Water Tower Nozzle Assembly is built by Pierre Thibault and is designed to provide a water discharge
of spray, or fog, at the tip of the ladder. It can be controlled remotely from the Ladder Control Console or
directly at the ladder tip.
The Nozzle Assembly (see Figure 5-3) is divided into the Tip (1), the Body (2), the Hydraulic Pump and
Electric Valves and the Actuators (3) and (4). The Tip is made by Task Force and is described in detail in
Part 2, Volume 3, TAB 17. The Hydraulic Pump and Valves are controlled by a set of three switches
located at the tip of the ladder (see Figure 5-4) or by a duplicate set located at the Ladder Control Console
(see Figure 4-7, numbers 10, 11 and 12).
Deflecting a nozzle control switch causes the Electric Motor (see Figure 5-5, number 3 and Figure 5-5-1,
number 1) to operate the Hydraulic Pump in the Power Pack and energizes the appropriate solenoid on
the valve selected (see Figure 5-5, number 1 and Figure 5-5-2, number 1). Hydraulic fluid is directed to
the Sweep, Elevation or Pattern Actuator by one of the electrically controlled valves (see Figure 5-6). Oil
entering one side of an actuator cylinder causes the actuator piston to move and force an equal amount of
oil to exit the other side of the cylinder. The actuator piston rod, through the action of a rack and pinion
assembly, causes movement of the nozzle in elevation or sweep (see Figure 5-7). Pattern selection is
caused by an actuator integral to the Task Force Nozzle (refer to Part 2, Volume 3, TAB 17).
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