Hale MG - Manual (Page 36)

Muscle Pumps
2-2
8. Verify that the pump panel shift indicator
green "OK TO PUMP" light is on.
9. Open the hydrant.
10. If necessary, open the suction valve.
11. If applicable, set the transfer valve to either
volume or pressure, as required.
12. If necessary to eliminate air pockets open
valve to let air out or prime the pump: see
“Pumping From Draft” for instructions.
13. Note the intake and discharge pressures then
open the engine throttle gradually until the
master discharge gauge indicates the desired
pressure.
14. Set the automatic relief valve according to your
fire department policy. If your fire department
does not have a policy to follow, see the “Relief
Valve or TPM Procedures” later in this section
DO NOT REDUCE THE PRESSURE ON THE
INTAKE GAUGE TO ZERO; SERIOUS DAMAGE
TO THE WATER MAIN COULD RESULT.
If the master intake gauge shows a vacuum before
the desired discharge pressure or flow is reached,
this is an indication that you are getting all the water
that the hydrant will supply. To increase the
pressure when this occurs, reduce the pump flow.
The master intake gauge reading must be
maintained at 5 PSI (.5 BAR), minimum.
As the throttle is opened, the pressure gauge reading
increases with the engine speed. If the engine speed
increases without an increase in pressure, the pump
may be cavitating. In this case, close the throttle
slowly until the pressure begins to drop, and the
engine returns to an idle. If this does not correct the
problem you are trying to pump more capacity than is
available from the hydrant.
15. Open the discharge valves.
16. If the pump overheats and is not equipped with
the Hale TRV valve, open the valve to access
the pump auxiliary cooling system, or slightly
open the tank fill line.
17. After completion of pumping procedures,
gradually reduce the pump pressure until the
engine is at an idle speed. Use the “Pump to
Road Shift Procedure” and “Post Operation
Procedure” provided later in this section.
TPM Operation from a Hydrant
When operating from a positive inlet pressure,
during some operational conditions, it may be
necessary to adjust the TPM Relief Valve to a
point where water is dumping to the ground. The
internal relief valve will always open first, and if it
cannot handle the pressure rise, the external relief
valve will dump water on the ground. When the
internal relief valve opens, the panel light will be
on, and when the external dump valve opens, the
pilot light on the panel will flash.
Pumping From Draft, General Operation.
1. Get as close to the water source as possible.
The pump can do better than its rated capacity
with less than a 10-foot vertical lift. As the
vertical lift increases to above 10 feet, the
maximum pump capacity will be reduced.
REFER TO THE FIRE DEPARTMENT
PROCEDURES IN SETTING WHEEL CHOCKS
AS WELL AS LAY OUT AND CONNECTION OF
SUCTION AND DISCHARGE HOSES.
ALL VALVES, DRAIN COCKS, AND CAPS
SHOULD BE CLOSED.
NEVER ATTEMPT TO SHIFT THE PUMP
TRANSMISSION WHILE THE TRUCK
TRANSMISSION IS IN GEAR. ALWAYS
SWITCH THE TRANSMISSION TO “N” AND
VERIFY THE SPEEDOMETER IS “0” BEFORE
MAKING PUMP TRANSMISSION SHIFT.