MIL-DTL-11891G(AT)
APPENDIX C
in the recessed area between the track pins as illustrated in figure 17. An example of the coding
system to be used is as follows: X01, X02 .... X160 (X for Contractor ABC and 1,2,3 etc. for
numeric shoe designation). The test site shall contact the Preparing Activity to request a code
letter identification upon receipt of a contractors supplied hardware.
C.3.10 Track shoe installation pattern. Each vehicle will have the capacity to test three
contractors samples. Each strand will consist of 27 assemblies from each of three contractors and
three Government furnished T107 assemblies. The Government furnished assemblies will be
removed, as required, to maintain track tension. Two transition shoes (one of each of two
different contractors) at the connection points will not be considered in the qualification sample,
making the qualification sample size 25 in each of two strands. The track shoe installation pattern
on the M88 series vehicle shall be provided to the test site by the Preparing Activity. Track
installation shall be accomplished in accordance with the appropriate technical manuals.
C.3.11 Load condition. For the test, the weight of the M88 vehicle shall be adjusted to
112,000 pounds, plus or minus 400 pounds. The load shall be distributed approximately equal on
each track when on a level surface.
C.3.12 Pivoting of vehicles. Pivot steering of vehicles during break-in and qualification
testing is to be-kept at a minimum. Sudden braking action shall also be avoided to the extent
possible.
C.3.13 Track tension adjustments. All tension adjustments shall be made prior to the start
of the test as well as during test operations. As a minimum, track tension shall be checked on a
daily basis. These adjustments shall be made after inspection faults have been corrected. Track
tension requirements can be found in the latest technical manuals for the M88 series vehicle.
NOTE: Low track tension will cause thrown tracks, broken or bent pins, and broken 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.
C.3.14 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 table
IX. The individual shoe replacements shall be made in the same strand location as the respective
failed shoes.
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