MIL-DTL-11891G(AT)
APPENDIX C
C.3.14.1 Hardware torque check. When track shoes, center guides, or end connectors
are replaced, the new hardware must be torqued checked after the first 50 miles of operation.
C.3.15 Torque values. All T107 track hardware shall be torqued to the following values
and in accordance with proper maintenance procedures:
Connector wedge bolt
180 - 200 lb-ft.
Center guide nuts
300 - 320 lb-ft.
C.3.l6 Break-in run. The purpose of the break-in run procedure is to simulate the natural
aging process afforded production/spare track during normal transit/storage periods before actual
vehicle use. All test samples (to include spares) 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 of
Speed
Distance
miles (min)
break-in run
m.p.h. (max)
a
10
15
b
15
15
c
20
15
C.3.16.1 Vehicle operation. The vehicle shall be operated in both directions for one-half
of the total vehicle distance.
C.3.16.2 Track cooling. During the break-in run, the track shall be allowed to cool
between each phase of testing. This cooling of the track can be verified through one of the
following two procedures.
C.3.16.2.1 Track roadwheel path surface. The track roadwheel path surface shall be
cooled to the point where the palm of the hand can be held to the surface in excess of 10 seconds.
C.3.16.2.2 Speed change cool down. 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 road side. A reading of 130 degrees or less should be recorded prior to
restart of the break-in.
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