MIL-DTL-11891G(AT)
APPENDIX D
D.3.17.1 Torque values. All T157I track hardware shall be torqued to the following
values and in accordance with proper maintenance procedures:
Pad nut - MS51943
135-155 lb-ft
Nut, self-locking - P/N 12308644-1
299-325 lb-ft
(used on track shoe rod, see figure 24)
D.3.18 Break-in run. The purpose of the break-in run procedure is to simulate the natural
aging process afforded production/spare pads during normal transit/storage periods before actual
vehicle use. All test samples (to include spares and all pads provided for qualification) shall be
broken in prior to the road test by having the vehicle on which they are installed, continuously
operated for 45 miles on a paved road (concrete, asphalt, or macadam) as follows:
Division
Speed
Distance
miles (min)
break-in run
m.p.h. (max)
a
10
15
b
15
15
c
20
15
D.3.18.1 Vehicle operation. The vehicle shall be operated in both directions for one-half
of the total vehicle distance.
D.3.18.2 Track cooling (break-in). During the break-in run, the track shall be allowed to
cool between each phase of testing. The cooling of the track can be verified through one of the
following two procedures.
D.3.18.2.1 Track roadwheel cooling. The track roadwheel path surface shall be cooled to
the point where the palm of the hand can be held to the surface backing in excess of 10 seconds.
D.3.18.2.2 Cool down between speed changes. Cool down between speed changes shall
require the use of a device used to measure the temperature of the rubber pads (see figure 7 for a
diagrammed example of this type of device). Measurements should be taken from both the
roadwheel side and the roadside. A reading of 130 degrees or less should be recorded prior to
restart of the break-in.
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