Pierce Pumper, Operation & Maintenance Manual

Page: 49 / 66

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Pierce Pumper / 3-33
OPERATION
3. Emergency shut-off.
a. Push IN the red button to return engine speed to IDLE.
b. Practice hitting the emergency stop button until the movement becomes automatic. In an emergency you
want to react automatically.
c. If you fail to shift from ROAD to PUMP, you can override the parking brake as you increase engine RPMs.
If you feel the apparatus move, IMMEDIATELY push IN the emergency stop. It drops engine speed to IDLE.
The wheel chocks and parking brake will then hold the vehicle in place.
4. Increase engine speed using optional electronic throttle.
a. Adjust engine speed using toggle switch.
b. Press red button to return to IDLE. Red button is also an Emergency Stop. Practice using the Emergency
Stop.
5. Observe master discharge pressure gauge.
Increase or decrease engine speed to maintain the pump pressure you want. Watch the master discharge
Gauge and adjust the engine speed faster or slower to get the pressure you want.
6. Activate discharge relief valve.
For apparatus equipped with an ON/OFF switch, turn the discharge relief valve ON.
The discharge relief valve prevents pressure spikes. It limits the maximum discharge pressure by opening a gate
and bypassing water back to inlet side of pump.
If the discharge pressure goes above the relief valve setting, water goes from the discharge manifold back into
the intake manifold until the water pressure in the discharge manifold drops below the relief pressure.
Emergency Stop button drops the engine to IDLE only.
Engine at IDLE creates water pressure.
•
If an emergency requires that water stop flowing, close the discharge valves.
• If an emergency requires that the engine stop, turn OFF the ignition switch in the cab.
Press red shutdown button on the hand throttle after use to make sure it is set to lowest possible idle
speed.
Hand throttle left at a higher speed will return to that speed when hand throttle control is resumed.
Practice hitting the Emergency Stop switch.
The Emergency Stop switch will drop the engine RPM to IDLE.
Practice this action until it is second nature, so you can bring engine to IDLE in an emergency.