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|  MIL-T-62021E(AT)
3.5.2.1 Tank connections. The pipe connection to the pump shall be located in such a
position that the entire bottom of the tank serves as a low velocity settling chamber. A 50 mm
(two-inch) drain fitting equipped with a 50 mm (two-inch) gate valve, located for easy access,
shall be provided in the bottom or at the rear so water can be dumped directly into a manhole
without moving the machine. External sight gages or means of determining when the tank is full
shall be provided on each side. The external sight gages or other means shall be located so that
they are visible both during the filling operation and the cleaning operation. The tank filler
mechanism shall allow the tank to be filled from both the curb side and the street side of the
vehicle. Tank filler mechanism shall include a 100 mm (four-inch) air gap. The tank shall be
vented at all times to prevent the buildup of either positive or negative pressure within the tank
from any cause. Access opening(s) at the top of the tank, for inspection and cleaning purposes
shall be furnished. A permanently attached steel ladder to provide access to the top of the tank
shall be provided.
3.5.3 Auxiliary engine. Unless a power takeoff is furnished, an auxiliary engine,
operating on the same type of fuel as the main chassis engine, shall be provided for driving the
water pump. The auxiliary engine shall be a liquid cooled, four-stroke cycle, (two or four-stroke
cycle for diesel engines) reciprocating industrial type. The engine furnished shall be capable of
meeting the performance requirements when operated at an engine speed no greater than the
manufacturer's recommended operating speed. When a gasoline engine is furnished, it shall have
not less than a 4920 cm3 (300 cubic inch) displacement.
3.5.3.1 Auxiliary engine mounting and enclosure. The auxiliary engine shall be totally
enclosed and fitted with ventilation panels and hood that shall prevent road splash and rain.
Hinged access panels, constructed with louvers for ventilation, shall be installed on each side and
secured with a positive locking device. Hinges shall be bolted to cabinet doors. The panels and
doors shall not vibrate or drum. The panels and doors shall be constructed of not less than
16 gage (1.519 mm) (0.0598 inch) hot rolled mild steel.
*
3.5.3.2 Engine control devices. Control devices shall be furnished for the engine
(see 3.5.6). Automatic control devices shall include a high temperature control (coolant control
set at 104C (220F)), an oil pressure control set at the engine manufacturer's minimum
recommended oil pressure.
3.5.3.3 Starting system. A starting system of 12-volt dc potential shall be used on the
auxiliary engine. The system shall include a starting motor with solenoid switch, an alternator,
and a voltage regulator. A battery of 12-volt potential, with capacity compatible with the
application, shall be furnished.
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