Table 2-1. Street Side Operator's Controls and Indicators
250 GPM Mini-Pumper Firefighting Truck (Continued)
(Refer to Figure 2-1)
Control or Indicator
Primer Control Knob.
The Primer Control Knob is used to electrically activate the automatic
primer control valve and primer pump which allows air to be drawn from
the pump and replaced with water.
Increase engine speed, pull out primer control knob and hold out until
pressure on master pump pressure gauge appears. After pressure is
achieved, release knob and increase engine RPM to desired operating
23. 2 1/2 Inch Discharge Outlet
The 2 1/2 Inch Discharge Outlet is
used to drain the 21 inch discharge outlet. To operate, pull the knob all
the way out to drain the outlet. Push the knob in to close the drain.
24. Booster Hose Outlet
The Booster Hose Outlet Control
Handle controls the flow of water from the pump to the rear hose reel.
To operate the valve, pull the handle to open the valve. This allows water to flow to the hose reel.
To stop the flow of water to the hose reel, push the handle all the way in to close the valve.