ZZ-T-1083 Tire, Pneumatic, Low Speed, Off HighwayThis specification covers new and retreaded pneumatic tires, both tube and tubeless types, and flaps when applicable, for mounting on construction, earthmoving, mining and logging equipment, road graders, mobile cranes, and similar vehicles operated at low speeds off the road.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17

ZZ-T-1083F

of the tire. In the event the tire fails to break before the plunger is stopped by reaching the rim, the force and penetration shall be taken as this occurs. Tubes shall be allowed in tubeless tires. The energy to break a tire shall be calculated from the average energy values at break by means of the following formula:

W = energy at break in inch-pounds

W = F P F = force at break in pounds

P = penetration at break in inches

4.3.3 HIDDEN DEFECTS INSPECTION. A visual inspection of two tires shall be made for evidence of hidden defects. One tire shall be cut into not less than eight equal cross sections, with each section being cut circumferentially in midcrown and on each side of the crown at the point of maximum shoulder thickness; any additional cuts deemed necessary for complete inspection of the tire shall be made. The cut sections shall then be inspected for evidence of hidden defects such as separation of tread, ply, or bead in accordance with MIL-STD-1224.

4.3.4 TENSILE STRENGTH AND ELONGATION TEST. After being checked for hidden defects, the tire shall be subjected to test for tensile strength and ultimate elongation of tread and sidewall, to determine the conformance to 3.4.3.1 and 3.4.3.2.

4.3.4.1 PREPARATION OF TEST SAMPLES. Test samples shall be cut (longitudinally at the center of tread or sidewall) in accordance with ASTM D 412. On tread samples, the nonskid portion shall be sliced off with a knife, after which the central portion shall be buffed on each side over a length of 2 1/2 inches until free of ply or breaker compound, fabric impressions, or irregularities of surface. On sidewall samples rubber solvent shall be used, if necessary, to separate rubber and fabric, and one or both sides shall be buffed as necessary.

4.3.4.2 PROCEDURE The samples prepared as specified in 4.3.4.1 shall be tested for tensile strength and ultimate elongation in accordance with ASTM D 412.

4.3.5 INSPECTION OF PREPARATION FOR DELIVERY. The preservation, packaging, packing, and marking of the tires shall be inspected to determine conformance to the applicable requirements of section 5.

4.4 QUALITY CONFORMANCE INSPECTION.

4.4.1 SAMPLING FOR INSPECTION AND ACCEPTANCE. Sampling for inspection and acceptance shall be performed in accordance with the provisions set forth in MIL-STD-105. Testing, if specified, shall be performed at the supplier's or other commercial laboratory acceptable to the Government.