Water can be loaded from a hydrant or a tank truck by first removing the circular cover on the hopper-
blender then inserting a hose (not part of the M12A1 PDDA) in the hopper-blender assembly. Fill the
An alternate method of filling the hopper-blender from a pressure source is to use the suction hose
provided with the PDDA. First, attach one end of the suction hose to the tank drain valve. Then using a
suitable adaptor (not part of the PDDA), connect the opposite end of the suction hose to the pressure
source. Open the tank drain valve and monitor the filling progress on the tank liquid level indicator
because it can be very rapid.
LOADING WATER FROM A NATURAL WATER SOURCE
If the height from the natural water source to the pump does not exceed 15 feet, water can be loaded
from a stream, pond, or other natural source by using the suction hose and foot valve assembly. To do
so, use the following steps.
Step 1. See that valves 1, 2, 3, 4, and the pump
drain valve are closed (Figure 27). Be sure the
two discharge and one suction connectors on the
pump unit are capped. Remove the tank lid
from the prime-detergent tank. Fill the prime-
detergent tank with water and replace the tank
Step 2. Open valve 4 to allow water from the
prime-detergent tank to fill the pump cavity.
Open the pump drain valve briefly and allow
some water to run out. Then close the pump
drain valve. Remove the cover panels marked
Figure 27. Valve positions before filling tank
REMOVE BEFORE OPERATING on the pump
Step 3. Remove the exhaust pipe extensions and suction hose from the top of the tank unit. Straighten
out the suction hose. Remove the blender hose from inside the suction hose. Remove the protective cap
from the upper discharge connector. Connect the blender hose to the upper discharge hose connector.
Connect the other end of the blender hose to the agitator connector on the tank unit.
Step 4. Remove the protective cap from the suction hose quick-disconnect coupling half on the
connector panel. Connect one of the two quick-disconnect coupling half ends of the suction hose to the
suction hose quick-disconnect coupling half on the connector panel.
Step 5. Remove the foot valve assembly from its bracket on the tank unit. Connect the other quick-
disconnect coupling half end of the suction hose to the foot valve. Submerge an empty STB