Hale MG - Manual (Page 37)

Muscle Pumps
2-3
2. Bring the truck to a complete stop before you
attempt to connect suction hoses or shift from
road to pump.
3. Apply the truck parking brake.
4. Shift the truck transmission to the NEUTRAL
position.
5. Move the in-cab pump shift control valve from
the ROAD to the PUMP position. The shift
warning light should come on in a second or
two, indicating a completed shift. If the truck
manufacturer has used another in-cab valve to
achieve pump shift, follow the instructions
supplied with that valve
6. After pump shift is complete, put the truck
transmission in the proper pump operating
range or gear. For most pumpers this will be
direct drive (1:1) ratio. In addition, the
speedometer should read 5 to 15 MPH after the
shift has been completed. If the shift does not
seem to be completed, shift truck transmission
to “N” and repeat the entire procedure. Note
that some vehicles drive the speedometer from
the front wheel of the chassis. In this case, the
speedometer will not read 5 to 15 MPH after
shifting to the pump position. See the chassis
manual for details.
DO NOT LEAVE THE CAB OR ATTEMPT TO
PUMP UNTIL ALL THE GREEN PUMP
LIGHTS IN THE CAB AND PANEL ARE ON.
7. Exit the driving compartment only after all
the above steps are completed and you are
sure that the shift completed lights in the
cab and panel are on.
DO NOT OPEN THROTTLE UNLESS ALL
GREEN PUMP INDICATOR LIGHTS ARE
ON.
8. Verify that the pump shift indicator light is on.
9. Activate the priming pump by pulling the
control handle located on the pump panel or
depressing the push button.
The departmental manual for pumping should
specify the correct RPM for priming, but in
general, for priming the pump should be
operated at idle with an engine speed of about
1,000 to 1,200 RPM.
10. Watch the intake and discharge master gauges.
When the pump is primed, the intake
indication reading falls below zero, and the
discharge pressure starts to increase. You may
also hear water discharging on the ground,
indicating that the pump is primed.
Running the engine at speeds higher than
1,200 RPM during priming is not
recommended, because it will not improve
priming operation. Running the pump at higher
RPM will increase wear.
IF THE DISCHARGE GAUGE READING DOES
NOT INCREASE, THE INTAKE GAUGE
READING DOES NOT FALL BELOW ZERO, OR
THE PRIMING PUMP DOES NOT DISCHARGE
WATER ON THE GROUND IN 30 SECONDS, DO
NOT CONTINUE TO RUN THE PRIMING PUMP.
STOP THE PUMP, AND CHECK FOR AIR
LEAKS OR POSSIBLE PUMP TROUBLE.
11. After priming, select the desired transfer
valve position (for two-stage pumps).
12. Gradually open the discharge valve until
the water emerges as a steady stream. Then
open the other discharge valves to the
desired setting.
13. Open the engine throttle gradually until the
desired pressure or flow is reached.