MIL-DTL-11891 Track Shoe Sets, Track Shoe Assemblies, Track Shoe Pads And Track Shoe Bushings, Vehicular: ElastomerizedThis specification identifies the requirements for qualification and production control of track systems supporting U.S. Military Tracked Vehicles. This specification is intended primarily for the qualification of elastomeric compounds used in the fabrication of track and track components and to ensure that the quality and performance established at qualification is maintained throughout production. The contractor is held fully responsible for the entire assembly/component including all non-elastomeric components and fasteners.

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MIL-DTL-11891G(AT)

APPENDIX D

D.3.11 Serial marking. Serial marking of pads may be required as specified by the

Preparing Activity.

D.3.12 Pad installation (qualification). Pads supplied for pad qualification only will be

installed on Government furnished T157I track assemblies.

D.3.13 Load condition of the vehicle. For the test, the weight of the Bradley vehicle shall

be adjusted to 64 375 pounds, plus or minus 500 pounds. The load shall be distributed

approximately equal on each track when on a level surface.

D.3.14 Pivoting of vehicle. Pivot steering of the vehicle during break-in and qualification

testing is to be kept at a minimum. Sudden braking action shall also be avoided to the extent

possible.

D.3.15 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 Bradley 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 rubber parts. Any grease or oil accidentally contacting the shoes shall be immediately wiped

off.

D.3.16 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 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.

D.3.17 New hardware. When track shoes and pads are replaced, the new hardware must

be torque checked after the first 50 miles of operation.