Step 3. Preheat the water to prevent the mixture from freezing before it can be used.
Step 4. Lubricate the engine with the grade of oil appropriate for use in winter conditions.
Step 5. When using the M12A1 PDDA at temperatures below freezing, any liquid left in the piping,
pump, tank, or discharge hose may freeze and damage the equipment. If operations are interrupted,
flush and drain the M12A1 PDDA.
Equipment Failure. If equipment fails (for example, broken drive belts, engine trouble, and so forth)
during cold weather while liquid is being sprayed, take the following steps to avoid damage due to
freezing.
Step 1. Open the gun assembly valves on the discharge hoses. Unreel the hoses from the hose reels to
drain as much liquid as possible out of the discharge hoses and slurry nozzles.
Step 2. Open the pump drain valve and valve 4 to drain as much liquid as possible out of the pump and
the prime-detergent tank.
Step 3. Disconnect the suction hose from the tank unit assembly and the pump unit assembly. Open the
tank drain valve and drain as much liquid as possible from the tank. Drain the suction hose, blender
hose, and M2 water heater.
Step 4. Notify organizational maintenance personnel to perform the necessary repairs.
Spraying Water. At temperatures below freezing, take the following steps to spray water.
Step 1. Winterize the M12A1 PDDA as specified in the winterizing procedures.
Step 2. Operate the engine and agitate or circulate the water that is in the tank unit assembly through the
pump unit assembly until ready to spray. Heat water to a satisfactory temperature above freezing by
using the M2 water heater.
CAUTION
Residual liquid in the piping, pump, and discharge hoses may freeze and
damage the equipment if the water circulation is interrupted.
Step 3. Start spraying and continue spraying without interruption until the tank unit assembly is empty.
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