Step 3. Open the four bracket clamps that are on top of the tank unit. Remove the exhaust pipe
extensions and suction hose. Straighten out the suction hose. Remove the blender hose from inside the
suction hose. Remove the protective cap from the lower discharge connector. Connect the blender hose
to the lower discharge hose connector. Connect the other end of the blender hose to the blender
connector on the hopper-blender.
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 the skid of the tank unit. Connect the other quick-
disconnect coupling half end of the suction hose to the foot valve. Submerge an empty STB
decontaminating agent drum or larger container in a natural water source. Place the foot valve end of
the suction hose in the bottom of the submerged container to minimize the danger of drawing mud or
bottom silt into the M12A1 PDDA.
NOTE: An alternate method of filling the tank with water from a natural source is to open valve 1 on the
control panel and unreel enough of the upper discharge hose from the hose reel to reach the tank
unit. Remove the tank lid from the hopper-blender. Open the valve on the gun assembly and
insert the discharge hose in the hopper-blender. Open valve 3.
Step 6. Attach the two exhaust pipe extensions to the two mufflers on either side of the engine. Perform
Steps 1 thru 10 specified on the engine checklist (Figure 22). This is a checklist; most of the actions
should already be done.
The gasoline engine exhaust fumes are lethal. Do NOT inhale these
fumes. A mask does not protect against carbon-monoxide fumes from the
engine. When the M12A1 PDDA is to be operated, the exhaust fumes
must be vented away from the operator to prevent carbon-monoxide
To avoid injury or electrical shock, keep the voltage regulator switch in
the OFF position when the M2 water heater is not in use.
Step 7. Fill the fuel tank with gasoline. Leave a one-inch void in the fuel tank.
Step 8. Pull the throttle all the way out (until it stops and can go no further). Then push the throttle in
approximately one-half the distance it was pulled out. Press in the low oil pressure switch and hold it
(Figure 23). Turn the start-magneto switch to the START position.