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|  MIL-T-62110G
by replaceable shafts. The rotating bearing surfaces of the derrick assembly at the turret which
are subjected to continuous wear shall be provided with replaceable bearings or bushings.
Lubrication fittings shall be provided on all rotating parts. The bearing surfaces shall be
adequate to resist torsional moment when inherent with the design.
3.6.2.2 Derrick operation. The rotating turret and derrick assembly shall be
hydraulically actuated by separate mechanisms. The derrick operating mechanism shall be
capable of limiting the lifting capabilities from rest position to those within the limits of the
design stress specified in 3.6 to prevent overloading. For testing purposes, means shall be
provided in the hydraulic system to perform the overload tests.
3.6.2.3 Derrick storage. For normal storage, travel and shipment of the vehicle, the
derrick shall retract into an essentially horizontal position parallel to the longitudinal centerline
of the vehicle. Saddle and tie-down devices shall be provided to support and hold down the
derrick assembly to prevent nonactuated raising of the derrick assembly when the vehicle is in
transit. Derrick saddles shall be sufficiently padded to prevent damage to any component of the
derrick. Type I storage device shall be capable of being swung to the side when not in use to
allow a clear opening to the vehicle body loadspace. When the derrick is in the travel position
(on type II and III vehicles), the derrick and its components shall not obstruct the vision of the
driver.
3.6.2.4 Capacity, height, and radius indicator. An indicator shall be furnished on the
operator's side of the derrick to visually display capacities, height and radius.
3.7 Derrick extension and aerial basket. Unless otherwise specified (see 6.2), a manually
operated, telescopic, fiberglass, nonconductive extension for the derrick shall be provided. The
extension shall mount a one-man fiberglass basket or when specified (see 3.7.3) two one-man
fiberglass baskets.
3.7.1 Plastic construction. Extension, basket and components shall consist of extruded,
pultruded, molded, or spiral wound fiberglass, and each component shall conform to the
performance requirements for electrical insulation specified herein. All components shall be
from a combination and multiple layers of sterile electrical grade fiberglass roving cloth or mat
with high impact strength resins with weathering and fire-retardant characteristics employed.
The exterior surface shall be smooth and of a uniform thickness. When gelcoat is applied, the
thickness of gelcoat shall be not less than 0.006 and not more than 0.030 inch. The parts shall be
free from uncured areas, gaps, cracks, holes, blisters, fuzzy surfaces, resin pockets, areas lacking
resin, laps, wrinkles, delamination, air or gas pockets, patches, porosity, and other similar
defects. The material shall be essentially void-free. The entire surface shall be fully cured and
free of tackiness. The percentage of glass by weight shall be approximately uniform.
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