00-C-2774
Engine cooling fans shall have heavy grille or ring
and egressing equipment.
type guards.
3.7 Stress requirements. Design of the completely assembled crane shall be
such that the maximum unit stress imposed will not exceed the minimum strength
margins contained in SAE 31063. Tests, in accordance with SAE J1063, shall have
been performed on the model crane being provided and test results shall be made
available for government inspection at the time of first article tests.
3.8 Performance. The crane shall be capable of independently and
simultaneously elevating the boom and rotating with a sweep of 360° continuous
rotation, and shall have a maximum rotational speed of not less than 2
revolutions per minute (rpm) for sizes A and B, and not less than 1.5 rpm for
size C and D. The crane, without load, shall be capable of attaining and
maintaining a travel speed, on level paved roads, of not less than 18 miles per
hour (mph) for sizes A and B, and not less than 16 mph for size C and D. The
crane, without load, shall be capable of traveling on unimproved roads, rough
terrain, and beach areas; shall travel up not less than 30 percent grade on
paved roads or hard-packed surfaces without engine stall; and shall be capable
of negotiating 15 percent side slopes.
3.8.1 Lif ting capacities. The crane shall have lifting capacities of not
less than the loads specified (see 6.1), at the radius specified (see 6.1), with
the boom length or lengths specified (see 6.1), and with or without outriggers
set as specified (see 6.1).
3.8.2 Stability. With lubricating and cooling systems full, fuel tank(s)
half full, with crane resting on firm, level, and uniform supporting surface,
with outriggers unsupported, with the boom fully retracted and in travel `
position, the crane shall conform to the following requirements:
With the longitudinal axis of the rotating superstructure of the
a.
crane at 90° to the longitudinal axis of the carrier, the boom
retracted and set at the minimum recommended radius, the total load
on all wheels on the side of the carrier under the boom shall be not
less than 15 percent of the total weight of the crane.
With the longitudinal axis of the rotating superstructure of the
b.
crane in line with the longitudinal axis of the carrier, in either
direction, the boom retracted and set at the minimum recommended
radius, the total load on all wheels under the lighter load end of
the carrier shall be not less than 15 percent of the total weight of
the crane.
3.8.3 Power load lowering. Power load lowering by hydraulic control shall
be provided for the winch(s) to facilitate controlled load lowering or lifting
at any boom lengths or elevation. The power down for the main winch shall have
sufficient capacity to raise, hold, and lower a load without slipping. The
power load lowering means shall provide positive control.
3.8.4 Rotation. The power transmission system used to rotate the
superstructure shall be hydraulic mechanical arrangement with a continuous
rotation of 360°. Swing speed within this range shall be smooth and constant,
and adequate control shall be provided to insure smooth starting and stopping.
An automatic or manual type swing lock or brake, capable of locking the
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