Hale SMR - Manual (Page 38)

Operating Procedures
3-4 Stainless Max Series Pumps
To increase the pressure when this occurs, reduce the pump
flow.
16. 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 hydrant can supply.
When this occurs, reduce the pump flow to increase the pres-
sure.
As the throttle is opened, the pressure gauge reading increases
with engine speed. If the engine speed increases without an
increase in pressure, the pump may be cavitating. (See heading
“Cavitation” on page 3-13.) In this case, close the throttle slowly
until the pressure begins to stabilize and track with engine speed.
If this does not correct the problem you may be trying to pump
more capacity than is available from the supply. Also check the
inlet strainers for possible debris restricting the flow.
17. Open the discharge valve(s).
IMPORTANT!
IF THE PUMP OVERHEATS AND IT IS NOT EQUIPPED WITH A HALE TRV
VALVE, OPEN THE VALVE TO ACCESS THE BYPASS LINE, IF SO
EQUIPPED, OR OPEN THE VALVE TO THE BOOSTER TANK (BOTH
SUCTION AND DISCHARGE SIDES) TO CIRCULATE WATER.
18. After completion of pumping, gradually reduce the pump pres-
sure until the engine is at an idle speed.
19. Verify that the operator’s hand throttle or governor control has
returned to idle position.
20. Shift the truck transmission into the NEUTRAL position, and wait
about four seconds. Check to make sure the speedometer reads
“0.”
21. Move pump shift control valve lever to the ROAD position. The
in-cab and panel pump indicator lights should go out when the
pump transmission starts to shift into the ROAD position.
22. When pumping operations are completed, gradually reduce the
pump pressure until the engine returns to idle speed. Disengage
the PTO.