OO-S-2822
3.6.1.3 Tires and rims.
Tires and rims shall be selected on the basis of
the size-and load range recommended in the latest issue of the TRA yearbook for
the imposed tire loads and the travel speeds specified in 3.6.1.1. The size of
the tires and rims shall be such that, unless otherwise specified (see 6.2.1),
the clearance between the ground and the lowest part of the chassis, including
the axle assembly, shall be not less than 14 inches (355.6 mm) and the angle of
departure shall be not less than 20°.
3.6.1.4 Landing leg. A hinged landing leg shall be provided to support the
front of the saw, when uncoupled, from the towing vehicle. The landing leg
shall be adjustable to permit leveling of the chassis. A positive locking
device shall be provided to hold the leg in the retracted position in transit.
3.6.1.5 Leveling jacks. Two rear leveling jacks shall be furnished to
permit supporting and leveling of the chassis during sawing operations. The
jacks shall be designed with an adjustable locking mechanism. Each jack shall
be equipped with a base having a bearing surface of not less than 30 square
Space shall be provided on the chassis for stowing the
inches (19354.8
jacks (if detachable type) during travel.
3.6.1.6 Drawbar towing ring.
Unless otherwise specified (see 6.2.1), the
lunette type, drawbar towing ring shall be fabricated of 1 5/8-inch (41.3 mm)
round steel stock and shall form a ring with a 3-inch (76.2 mm) ±1/16-inch
(1.6 mm) inside diameter. The mounting shall include two safety chains with
links formed of stock not less than 5/16-inch (7.9 mm) in diameter. The safety
chains shall be anchored to the chassis and shall extend 24 inches (609.6 mm)
beyond the towing ring. The loose end of each chain shall be fitted with a
safety type hook or a pin-type clevis. The safety chains shall meet the
requirements of DOT Federal Motor Carrier Safety Regulations.
3.6.1.7 Safety. For personnel protection, all rotating or moving parts and
parts subject to high operating temperature, shall be insulated, enclosed or
guarded.
3.6.2 Type I saw. The diesel engine and generator shall be capable of
operating for not less than eight hours without overheating, or other
detrimental effects.
3.6.2.1 Type I power supply. The power supply for the type I mobile saw
shall be an integral diesel engine driven generator. Unless otherwise specified
(see 6.2.1), the overall rating of the generator shall be not less than 10
kilowatts (kW). The generator shall be capable of providing 220 volts (V), 60
hertz (Hz), 3-phase power to the saw motor specified in 3.6.4, and 120V 60 Hz,
single-phase power to the receptacles specified in 3.6.5.
3.6.2.2 Diesel engine. The diesel engine shall be of sufficient horsepower
and rating to drive the generator specified in 3.6.2.1. The diesel engine shall
start in any temperature from -20° Fahrenheit (F) (-28.9° Celsius (C)) to 120°F
(48.9°C). Starting aids may be either electric glow plug or ether primer. When
an ether priming system is provided, it shall be of the measured shot type with
storage capacity of not less than 12 fluid ounces (354.9 milliliters (mL).
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