Pierce Pumping Flashcards
Intake Relief Valve set at
250 psi
When operating the pump, be sure to open at least_____. If the pump runs for a few minutes completely closed, it may heat the water enough
to scald someone when the valve is opened. Overheating can damage the seals and other pump parts
one discharge valve slightly to prevent the pump
from overheating
It is classified as a nonpositive displacement pump since it does _____.
not pump a definite amount of water with each revolution.
It imparts
velocity to the water and ____.
coverts it to pressure within the pump itself.
The impeller transmits energy in the form of ____ to the water.
velocity
The housing collects the water and confines it (the water) within the housing thus ______.
converting water velocity to water
pressure.
The first indication that wear is becoming a problem in the pump is when ____ is
required to pump in the rated capacity in pump tests,
increased engine rpm
Whenever the pump is delivering more than approximately \_\_\_\_of its rated capacity of 1500 gpm, the parallel (volume) position should be selected on the transfer valve
70%
If equipped with 4WD, engage the water pump with the transfer case in ____. Vehicle will move if
the pump is engaged when in 4WD. Death or injury may occur.
2WD ONLY.
In manual override mode, the pump speed will be controlled only by the ____.
throttle pedal.
Keep pump water cool. Do not operate the pump for extended periods with the discharge valves closed or the pump may
overheat. The pump is fitted with a ______ to help prevent overheating.
thermal relief valve
Air pressure gauges should indicate _______. Pump may not shift out of road position if the air pressure is below 80 PSI.
80 PSI or greater.
Flip pump shift control lever DOWN to engage pump. Wait _____ for pump engagement.
up to 4 seconds
Pump may not engage if gear teeth fail to mesh. In this case:
Shift to N → Shift to R → Shift to N → Shift to D
If the speedometer indicates some value of road speed _______ AND the vehicle is not moving,
the pump is successfully engaged.
(approx. 12-18 MPH)
Manual Pump Shift Override:
If the _____ the pump, THEN use the manual pump shift instead of the air shift. This is a manual
override and requires____ to operate.
air shift fails to engage / two people
Manual Pump Shift Override:
- Position one person in the ____ and one person at the ____.
- Shift transmission Into NEUTRAL (N).
- Apply parking brake.
driver’s seat / pump panel
Manual Pump Shift Override:
- Apply service brake by pressing and holding the brake pedal.
- Place pump shift control in ____
- Engage the manual shift handle
NEUTRAL
NOTE: Depending on pump model, _____ the manual shift T-handle, using steady pressure
pull in or push out
Manual Pump Shift Override:
- Place pump shift control in ___ position.
- Shift the transmission into DRIVE (D).
PUMP
Pump Disengagement:
WAIT____ after shifting to NEUTRAL (N) for pump drive shaft to stop spinning
3-5 seconds
Pump Disengagement:
Speedometer should read _____ . If the speedometer reads ANY speed e.g. 1-10 MPH or more), then repeat
the entire procedure.
0 MPH
If high pressure is required ______ 13.8 bar, operating the pump in the PRESSURE position may be necessary
even if it means closing one or more valves to reduce volume and avoid cavitation.
more than 200 psi,
Slow engine speed to reduce the discharge pressure to _____ (5.2
bar) or less while changing from pressure to volume.
75 psi
