MIL-DTL-11891G(AT)
APPENDIX B
end connectors and center guides. High track tension shall also be avoided. Track pins will break
and tracks will be thrown, the track adjuster or grease gun shall be kept from contacting the track
shoe rubber parts. Any grease or oil accidentally contacting the shoe shall be immediately wiped
off.
B.3.15 Track component replacement. Track shoe assembly replacements are required
based on meeting the failure criteria for any number of component parts (bushing, roadwheel path
rubber, center guide, or shoe body damage). The component failure criteria is detailed in the table
VII. The individual shoe replacements shall be made in the same strand location as the respective
failed shoes. In addition, if the pads meet the acceptance criteria, the pads from the original track
shoe shall be reinstalled on the replacement shoe.
B.3.15.1 Hardware torque. When track shoes, pads or end connectors are replaced, the
new hardware must be torqued checked after the first 50 miles of operation.
B.3.16 Torque values. All T154 track hardware shall be torqued to the following values
and in accordance with proper maintenance procedures:
Clamp type end connector
400 +20 wet lb-ft.
Track shoe pad nuts
110 - 150 dry lb-ft.
B.3.17 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 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 of
Speed
Distance
Break-in run
m.p.h. (max)
miles (min)
a
10
15
b
15
15
c
20
15
B.3.17.1 Vehicle operation. The vehicle shall be operated in both directions for one-half
of the total vehicle distance.
B.3.17.2 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.
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