MIL-T-62110G
conditions. Any evidence of cracks or permanent deformation shall be cause for rejection of the vehicle. At the manufacturer's option, dye penetrant and magnaflux inspection may be conducted prior to the first production vehicle inspection provided all tests specified in 4.4.2 through 4.4.3.4 are conducted prior to the inspection; these tests are repeated at the first production vehicle inspection; and records of the tests and magnaflux and dye penetrant inspection witnessed by the Government are presented at the time of the first production vehicle inspection.
4.4.3.5.1 Critical area. At least the following areas shall be inspected by dye penetrant or magnaflux:
(a) Outriggers and attaching areas
(b) Turret base, trunnion, and yoke at attachment of the derrick and struts
(c) Cylinder clevis brackets
(d) Lower sheaves, sheave supporting brackets, cable anchor and support brackets (e) Upper sheaves, sheave supporting brackets, cable anchor, and support brackets (f) Structural steel of upper and lower derrick
(g) Upper derrick and yoke at attachment to basket and side brackets
(h) Fiberglass extension.
4.4.3.6 Temperature stabilization test. To determine conformance to 3.12.7, the vehicle shall be tested. The vehicle shall be placed in an area suitable for digging holes in firm, undisturbed soil and prepared for digger operation. The auger used shall be of the 24-inch size for size 55 vehicles and of the 30-inch size for size 70 vehicles. The ambient temperature shall be measured and recorded and a thermocouple or thermometer inserted in the hydraulic fluid reservoir at its inlet from the oil return line or, if an oil cooler is provided, at the inlet to the oil cooler. The digger shall be suspended just above the ground and continuously rotated at not less
than 75 rpm. The temperature of the hydraulic oil at the hydraulic oil return line or at the inlet to
the oil cooler, as applicable, shall be observed and the digger rotated until this temperature has stabilized. Immediately after the temperature stabilizes, the digger shall be used to dig a series of holes not less than 12 feet deep. Each hole shall be dug in rapid succession, with truck
movement time held to the minimum, and with spin-off time held to a minimum. For hard,
frozen ground or other hard soil requiring picking for removal, not less than three holes shall be dug. For all other firm, undisturbed soil conditions, not less than five holes shall be dug. A hydraulic fluid temperature exceeding 180°F at any time during the test shall be cause for rejection.
4.4.4 Position holding ability. The vehicle shall be placed in a longitudinal position on a grade of not less than 15 percent and not leveled by use of the outriggers. The telescoping section position, height, angle, and load producing maximum tipping moment within the conditions specified in table III shall be calculated. The derrick shall be placed under these
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