Hale Q Series Muscle - Manual (Page 62)

 Basic Operation
62 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
If your fire department does not have a policy, see heading “TPM Operation from
a Hydrant” on page 57.
14. To avoid pump overheating, if not equipped with the Hale TRV valve, open the
pump auxiliary cooling system valve, or slightly open the tank fill line.
15. After completion of pumping procedures, gradually reduce the engine RPM until it
is at an IDLE speed. See heading “Pump-To-Road Shift Procedures” on page 65.
Disengage the PTO per the PTO manufacturer’s instructions. Also see heading
“Post Operation Procedures” on page 69.
4.4 PUMPING IN RELAY
Relay pumping is the movement of water through a number of consecutive pumpers,
from suction to discharge. Relay operations are necessary when the water source is
too far away from the fire to be pumped efficiently by one pumper. The number of
pumpers is determined by how far the water source is from the fire.
In some cases, when you are on the receiving end of a relay, it may help to set the
suction dump or TPM (if available) very low. This limits the incoming pump pressure
by dumping water on the ground before the discharge hose lines are connected and
are flowing water.
Then, as the incoming water is used the relief valve control can be increased to the
desired operating pressure. This technique also helps to purge air from the incoming
hose and the pump before it gets to a dangerously high pressure.
Use this procedure after the hose is positioned, the apparatus are in position, and the
pumps are engaged. For setup and engagement instructions for apparatus receiving
pressurized water, see heading “Pumping From a Hydrant, General Operation” on
page 54.
Relay Procedures
Note: When feeding through a pump, the pump must be in pump gear and the transmission
in neutral in order to lubricate the pump and the intermediate gears.
1. Open two discharge gates on all pumps, except on the pump at the source, to
expel air from the hose lines and pumps.
2. On each pump, attach the hose lines to one of the discharges and leave the other
discharge uncapped.
Note: Uncapping the second discharge gate is not necessary if a relay valve is installed.
The valve, connected to the intake side of the pump, automatically opens and dumps water
on the ground if too high a pressure is supplied, protecting the pump.