TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

  TM-9-2350-311-10 - Page 562 of 775

TM 9–2350–311–10
5–34
5–2
AUTHORIZED MUNITIONS — CONTINUED
5–2.2
Authorized Fuzes — Continued
i.
M577 Series and M582 Series Mechanical Time and Superquick Fuzes
1
The M577 series fuze (12) and M582 series fuze (13) have a 200 second mechanical time mechanism
with three movable digital dials similar to a speedometer. Each fuze has a window through which the
dials are viewed. The dials permit setting of the fuze to the nearest tenth of a second. The M577A1 and
M582A1 fuzes contain a different mechanism for point detonating action. Externally the major difference
is the configuration of the wrench slots. The M577A1 and M582A1 fuzes are handled, set, and fired the
same as the basic models. Early manufactured basic and A1 fuzes have black paint finished ogives,
while the later produced A1 fuze has a gold (chromite finish) color ogive.
2
The dial closest to the M577 series fuze (12) and M582 series fuze (13) nose indicates the time in
hundreds of seconds. (The triangle (
A
) position is a nontime setting). The second dial indicates time in
ten second intervals. The third dial indicates the nearest second and also tenths of seconds by using the
scale on the right edge of the dial.
3
The M582 series fuze (13) is fitted with a booster and is used with burster type projectiles. The M577
series fuze does not contain a booster and is used with base-ejection projectiles. In order to minimize
identification problems, current production of the M582A1 fuzes contain a white stencil “M582A1” below
the window of the fuze body.
4
The M577 series fuze (12) can be used with a special spotting charge when firing the M483A1 or M864
projectile in the self-registration mode (para 5–4).
5
If M577 series fuze (12) and M582 series fuze (13) are set for time and the timing mechanism fails, the
fuze may or may not function on impact.
6
The M577 series fuze (12) and M582 series fuze (13) can be set with the M35 fuze setter or a flat-tip
screwdriver. The time-setting key is located on the end of the fuze nose. The desired time is set under
the hairline. Detailed setting instructions are outlined in paragraph 5–6.
7
The M577 series fuze (12) and M582 series fuze (13) are not sensitive to rain.
12
13


Back to Top