TM-9-2350-311-10

TM-9-2350-311-10 - Page 592 of 775

TM 9--2350--311--10

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FUZE SETTING — CONTINUED

d. Procedure Number 4, M564 and M565 Fuzes — Continued

NOTE

•

Alining the 20-second mark on lower cap scale with the 0.5-second mark on the vernier

scale is an incorrect setting for a 20.5-second fuze setting. Set in this manner, the fuze is

actually set to function at 10.5 seconds, causing the fuze to function earlier than desired.

•

Do not attempt to set the fuze until just before firing.

Resetting fuze. If the setting is missed, use the M34 or M18 fuze setter and turn the lower cap in the

opposite direction (counterclockwise) 2 or 3 seconds below the desired setting. Then rotate the lower

cap in the direction of the arrow (clockwise) and set the fuze on the correct time. Always make the final

setting from low to high numbers.

Fuzes not fired. If prepared for firing but not fired, reset the fuze, using M34 or M18 fuze setter, by

turning the lower cap in the direction of the arrow (clockwise) until the “S” mark on the fuze lower cap

scale (6) is in line with the “0” mark on the vernier scale (7).

Fuzes fired in heavy precipitation. If M564 fuzes are fired in heavy precipitation (rain, sleet, snow, or

hail), occasional downrange premature functioning may occur. The precipitation necessary to cause

malfunctioning is comparable to a heavy downpour which occurs during a summer thundershower. The

premature rate will vary with the charge fired and the density of the precipitation.

EXAMPLE OF INCORRECT SETTING

OF 20.5 SECONDS