TM 9-1345-203-12
7 Insert fuze gently into primary fuze well of
(1) Mine, antitank, practice: heavy, M12A1 (fig. 1-
16).
mine until it seats firmly. Avoid pressure on
pressure plate of fuze when inserting fuze into
Casualty effect and danger area.
(a)
fuze well. Assure proper clearance between
fuze pressure-plate button and shutter of arm-
1 Mine M12A1 is used in the training of person-
ing plug, by fully seating on internal shoulder
of mine fuze well.
nel in the proper method to be observed in the care, handling,
and use of heavy service antitank mines. It is shipped empty
NOTE
and filled in the field with sand to simulate weight of service
mines.
Because of tolerances permitted in the manu-
facture, the pressure plate of the fuze M604
2 Practice fuze M604 and practice activator M1
may interfere with the movement of the arming
contain smoke charges to simulate functioning of the mine.
plug. The shutter moves from an outside to a
Personnel are warned to be clear and under cover when mine
center position as the arming knob is turned
functions, since smoke charges explode to emit a cloud of
from the SAFE to the ARMED position. To
smoke and a loud noise.
predetermine whether there will be proper
clearance, an arming wrench M20 of recent
Laying and arming.
(b)
manufacture, with a depth gage consisting of a
lip projecting from its side, is provided. Use
1 Remove mine from packing.
the depth gage as instructed in paragraphs 8
and 9 below.
2 Examine for cracks, dents, or other signs of
unserviceability. If damage is found, replace
8 After insertion of the fuze into the fuze well of
mine with new one.
the mine, and before screwing the arming plug
into place, lay the arming wrench on its side on
3 Using arming plug wrench M20 (fig. 2-20),
top of the pressure plate of the mine so that the
unscrew arming plug from mine.
depth gage extends into the fuze well towards
the fuze.
4 Inspect fuze well and arming plug threads for
presence of foreign material and, if present,
9 When the end of the gage touches the pressure
remove. Presence of water in fuze well can be
plate of the fuze, it indicates improper clear-
dangerous in areas where temperature drops
ance. The lack of proper clearance can be rem-
below freezing and ice forms.
edied by screwing the arming plug into the
mine slightly less than its full normal distance
5 Remove fuze M604 from its metal shipping
so that the arming plug shutter can be moved
container and inspect for serviceability. If evi-
freely to the ARMED position. Never leave
dence of unserviceability is found, replace fuze
setting knob pointed to DANGER.
with new one.
10 With setting knob and shutter in SAFE posi-
6 Use hook end of arming wrench to remove
tion, screw arming plug into mine (see NOTE
safety fork from cover assembly of fuze. Save
above).
safety fork (clip) for use in disarming fuze.
11 Dig 15-inch diameter hole, approximately 5-6
inches deep, with sides sloping approximately
45 degrees.
