Section 1. GENERAL
This volume contains maintenance requirements for direct support and general support maintenance of
the M15 Ballistics Drive. See Volume 1 for troubleshooting information.
a. Chapter 2. General Maintenance Information lists maintenance items and references general
procedures that are necessary to do the maintenance procedures in this volume.
b. Chapter 3. Inspecton Upon Receipt gives the faults to look for when the unit is returned to DS/
GS. A complete inspection should be made and faults listed on DA Form 2404 before any repairs are
c. Chapter 4. Maintenance Procedures give step-by-step procedures to repair faults found during
inspection or troubleshooting.
d. Chapter 5. Final Inspection gives procedures to be done after repair to make sure that the
ballistics drive works and ready for packaging or installation.
e. Chapter 6. Packaging gives procedures for packaging the ballistics drive for storage or shipment.
f. Appendix A. Expendable Supplies and Materials List gives supplies and materials, with
specification or NSN, needed to repair the ballistics drive.
g. Appendix B. Maintenance Task Index helps you find maintenance tasks for the ballistics drive.
h. Appendix C. Fabricated Tools contains information that you will need to have these tools made.
i. Appendix D. Repair Parts and Special Tools List, gives a listing of repair parts, special tools, and
support equipment required for the performance of direct support and general support maintenance of
Section 2. DESCRIPTION AND DATA
The M15 ballistics drive is part of the primary direct sighting and fire control system of the 165-mm gun,
full tracked, combat engineer vehicle M728.
The ballistics drive causes a corresponding movement of the line of sight of the M32C periscope when the
gun is elevated or depressed.