Figure 1. Three components of the M12A1 PDDA.
The engine for the M12A1 PDDA is a military standard, four-cylinder, air-cooled, four-cycle, overhead
valve, 20-horsepower gasoline engine. It supplies power for the pump through two pulleys and four
drive belts. It supplies power to a generator/alternator through two pulleys and one drive belt. A 20-
gallon fuel tank stores gasoline for the engine. A 24-volt battery provides power to start the engine.
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 operated, vent the exhaust fumes away from
the operator to prevent carbon-monoxide poisoning.