HALE AP, Technical Manual

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19
ONLY after completing ALL previous steps, exit driving compartment. 9.
DO NOT OPEN THE THROTTLE UNLESS THE GREEN INDICATOR LIGHT IS ON.
SEE FIGURE 8.
Figure 9. Pump Operator Panel
Verify pump panel shift indicator light is on. 10.
Set wheel chocks. 11.
Complete all hose connections. 12.
B. Prepare pump to pump.
Open hydrant and bleeder valves (to bleed off air in suction hose). 1.
Open suction valve. 2.
If necessary to eliminate air pockets, prime pump. 3.
(For instructions, see paragraph 3.2, Pumping From Draft, on page 20.)
Slowly open appropriate discharge(s). 4.
Advance engine throttle gradually until master discharge gauge indicates 5.
desired pressure.
DO NOT ALLOW THE PRESSURE ON THE INTAKE GAUGE TO GO BELOW ZERO. PLAC-
ING A VACUUM ON THE WATER MAIN MAY RESULT IN SERIOUS DAMAGE TO OR FAIL-
URE OF THE WATER MAIN.
NOTES
The master intake gauge reading must be maintained at 5 psi (0.3 bar), minimum. If
the gauge shows a vacuum the pump is attempting to draw more water than the hy-
drant can supply. When this occurs, reduce the pump flow to increase the pressure.
As the throttle is opened, the pressure gauge reading should increase with the en-
gine speed. If the engine speed increases without an increase in pressure, the pump
is beginning to cavitate. Close the throttle slowly until the pressure begins to drop
and the engine returns to an idle.