TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
Page 588 of 775
TM 9-2350-311-10 5-6 FUZE SETTING - CONTINUED d. Procedure Number 4, M564 and M565 Fuzes The following procedures include instructions for setting the fuze for superquick (impact) action and airburst (time) and for meeting safety requirements. If the M564 fuze is to be fired for superquick action (impact) only, first check the year of manufacture stamped on the fuze body, then follow instructions below, as appropriate. To avoid accidental functioning of PD element in M564 fuze, do not drop, roll, or strike the M564 fuze under any circumstances (packaged, unpackaged, or assembled to the projectile). NOTE Do not attempt to set M564 fuzes until just before firing. 1 Setting M564 fuze for superquick (impact) action. NOTE M564 fuzes manufactured before January 1970 must be set on 90.0 seconds if superquick action (impact) is desired. M564 fuzes manufactured from January 1970 on, should be left set on "S" for superquick action. The year of manufacture is stamped on the M564 fuze body. These fuzes are shipped with the “S” on the lower cap scale alined with the “0” on the vernier scale. The numbers on the vernier scale represent tenths of a second and the numbers on the lower cap scale represent whole seconds. When setting the fuze, always rotate the lower cap scale. (a) For M564 fuzes manufactured prior to January 1970, use M34 fuze setter to rotate the lower cap in the direction of the arrow (5) (clockwise) from shipping “S” position until the 90-second position on the lower cap scale (6) is alined with the “0” on the vernier scale (7). (b) For M564 fuzes manufactured in January 1970 and later, set the M564 fuze on “S” as shipped for superquick action. Always be sure the "S" on the lower cap scale (6) is alined with the “0” on the vernier scale (7). 5-56