MIL-DTL-11891G(AT)
APPENDIX B
in the recessed area between the track pins as illustrated in figure 11. An example of the coding
system to be used is as follows: X0l, 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.
B.3.10.2 Serial pad marking. Serial marking of pads may be required as specified by the
Preparing Activity.
B.3.10.3 Pad installation and coding. Pads supplied for pad qualification only will be
installed on Government furnished T154 track assemblies. The Government furnished track shall
be coded using the alpha code letter "G" followed by a contractor code letter corresponding to
the contractor furnishing the pads for qualification. The code letters shall be located as illustrated
in figure 11.
B.3.11 Track shoe installation pattern. Each vehicle shall have the capacity to test two
contractors supplied samples. Each strand will consist of 39 assemblies from each of two
contractors and two Government furnished T154 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 37 in each of two strands. The track
shoe installation pattern on the M109 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.
B.3.12 Load condition. For the test, the weight of the M109 vehicle shall be adjusted to
58 500 pounds, plus or minus 400 pounds. The load shall be distributed approximately equal on
each track when on a level surface.
B.3.13 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.
B.3.14 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 M109 series vehicle.
NOTE: Low track tension will cause thrown tracks, broken or bent pins, and broken
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