Tank Unit Assembly
Inspect the exterior of the tank unit for evidence of leaks and loose hose connections.
See that liquid is in the pump (the pressure gage should read between 60 and 120 psi as noted in Figure
25). See that the discharge pressure remains at a constant level.
See that the hopper-blender is not clogged and operates properly. When loading agent, see that the
hopper does not run out of STB decontaminating agent. If the supply of agent is exhausted before the
loading is completed, the slurry in the tank may foam. Stop foaming by adding silicone antifoam agent.
Connections and Valves
Inspect the connections and control valves 1, 2, 3, and 4 for leakage; tighten if necessary. If tightening
the valves and connections does not stop leakage, report the defect to organizational maintenance
Guns and Nozzles
Inspect the gun and nozzles for leakage or erratic operation. Make sure there are no leaks when liquid is
sprayed or when the gun assembly is shut off under pressure-
See that the engine does not miss, run erratically, surge, or overheat. If necessary, discontinue operation
and perform engine maintenance if appropriate. Notify organizational maintenance personnel if the
problem is beyond operator maintenance level.
Be constantly alert for any unusual noises that are caused by damage or faulty operation. If the source
of the unusual noise is apparent and can be remedied, stop the M12A1 PDDA and correct the condition
if within operator capability.
Inspect for unusual gage readings, burned-out generator/alternator warning light, excessive vibration,
erratic spraying, or any other deficiencies in operation. If any deficiencies occur, stop the M12A1
PDDA and perform repairs, if authorized.