M2 Water Heater
Check the fuel lines and boiler and water connections for leakage. Stop operation if a leak is detected.
See that an adequate fuel supply is available. Visually inspect the water pressure, fuel pressure, and
water temperature gages for normal indications.
NOTE: Repairs and service that the operator is authorized to perform are listed in the appendix.
OPERATION UNDER UNUSUAL CONDITIONS
When the M12A1 PDDA is to be operated in cold weather, ice and snow, extreme heat, sand, dust, or a
salt water environment with high humidity, specified procedures must be followed to avoid damage to
Cold Weather Operation
For operation in temperatures below freezing (0 degrees Centigrade or 32 degrees Fahrenheit), the
M12A1 PDDA must be winterized. Slurry becomes thicker as the temperature decreases and should not
be used at temperatures below freezing.
The gasoline engine and the M2 water heater exhaust fumes are lethal. Do
not inhale these fumes. A mask does not protect against carbon-monoxide
fumes. When the M12A1 PDDA is to be operated, the exhaust fumes
must he vented away from the operator to prevent carbon-monoxide
Winterizing. The steps involved in winterizing the M12A1 PDDA are --
Step 1. When removing panels from the pump unit in preparation for operation, remove only two of the
panels that are marked REMOVE BEFORE OPERATING. The panels to be removed are next to the
Step 2. A fan air-cools the engine. In extremely cool temperatures, close off the oil pan baffle to shut
off the cooling air. Use the air control handle (Figure 19) to open or close the oil pan baffle.
Circulate only clear water through the M2 water heater to avoid damage.