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|  MIL-T-740G
For a crane capacity of 10,000 pounds, the maximum allowable settling (rate of descent) with
outriggers in place and crane capacity at 11 1/2 foot radius, and with system stabilized and oil
temperature at 100F, shall be not more than 3 inches in 6 minutes, using a two-part line with
power take-off lever engaged or disengaged and with load at least 15 inches from ground. The
specified crane capacities may be attained utilizing multiple line arrangement; two-part line
preferred. A three-part line arrangement may be utilized for lifting capacity requirements of
20,000 pounds.
3.4.11.1.5 Crane controls. Each control for operation of the crane shall be of the "deadman"
type and shall automatically return to neutral position should the operator inadvertently or
intentionally release the control.
3.4.11.1.6 Boom markings. Boom extension markings for M246A1, M246A2, and M819
only shall be the same color paint as the vehicle markings (see 6.8).
3.4.12 Trucks van; expansible (M291A1, M291A1D, M291A2, M291A2C, M291A2D,
M820, M820A1 and M820A2).
3.4.12.1 Van bodies. Van bodies shall expand to the maximum width without interference,
binding, or damage to the basic and extended positions of the van body or equipment. All locks
and fasteners shall be positive in locking or fastening the extended portion to the basic van body
so as to provide firm, water-tight joints.
3.4.12.2 Waterproofness. Van bodies and all components shall be waterproof to preclude
entrance of water due to rain, melting snow, and road splash or other causes. Vapor barrier
material shall be applied to prevent possible accumulation of condensation on interior of van
body. Prior to riveting, the seams shall be coated with sealer to provide a waterproof joint.
3.4.12.3 Heaters and air conditioners. Heaters and air conditioners furnished and installed
shall meet all requirements specified herein.
3.4.12.3.1 Heaters. Two multi-fuel burning space heaters, conforming to specified drawings
and having an output capacity of not less than 60,000 Btu/hr, shall be capable of operating from
a 120 volt, single phase, 60 cycle electrical source.
3.4.12.3.2 Airflow modulation. each heater shall incorporate an air inlet damper, actuated
from the underside of bonnet on the outside of the van. pulling for fresh air and pushing for
recirculating air shall control the percentage of circulating air mixture.
3.4.12.3.3 Air conditioner. Air conditioner, conforming to specified drawings, shall control
air temperature under all operating conditions.
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