1. Purpose.-a. This manual is published for the information and guidance of ordnance maintenance personnel. It contains instruc- tions for the inspection, maintenance, and repair of the following 75-mm guns and carriages, and special field artillery vehicles: *This manual supersedes TM 9-1305, October 27, 1941, and TR 1410-126, July 31, 1925, including changes No. 1, January 3, 1927, and changes No. 2, January 2, 1934. b. These instructions are supplementary to those in the Field and Technical Manuals prepared for the using arm. Additional descriptive matter and illustrations are included to aid in providing a complete working knowledge of the matériel. 2. General.-Inspection is for the purpose of determining by criti-cal examination the condition of the matériel, whether repairs or adjustments are required, that all modifications authorized by field. service modification work orders (FSMWO) have been made, and to insure that the matériel is in such serviceable condition that it will function properly. 3. Artillery gun book (0. 0. Form 5825). -a. Complete instructions for the use of this book are contained in instructions therein.. NOTE. The gun book should accompany the gun at all times, and inspectors should insist on seeing it. They should make sure that instructions therein. are being carried out and that it is posted up to date. b. In the event the gun book should become lost and the original star-gage report of the gun cannot be obtained, the inspector may assume that the lands of the gun, 87.375 inches from the muzzle, are within the manufacturing limit of plus 0.004 on the normal dimension of 2,950 inches. If a star-gage reading of 2.964 is obtained (an increase of 0.010 over the maximum size of 2.954 for a new gun), the remaining life of the gun may be appraised between 5,000 to 6,000 rounds. 4. Average life of gun. -The average life of the gun is approximately 10,000 rounds. The guns in service should be star-gaged after approximately 10 percent and 90 percent of their estimated accuracy life, and thereafter at each 10 percent during the remainder of their service. |