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Page Title: Section VI. CHASSIS ASSEMBLY (1A2A2)
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Figure 3-20. Aligning pump assembly.		Up
TM-3-6665-302-34 Detector Unit Chemical Agent Automatic Alarm M43 and Chemical Agent Automatic Alarm M42 Manual		Next
Figure 3-21. Chassis assembly, exploded view.

TM 3-6665-302-34
(3) Remove retaining ring (32).
latch raised, over mounting holes in pump unit
subassembly (29).
(4) Remove roller (31 ).
(2) Install and tighten screws (27).
b. Installation.
(1) Install roller (31) on its shaft.
3-34. Rollers
(fig. 3-18)
(2) Install retaining ring (32) in notch of
roller shaft.
a. Removal.
(3) Connect springs (14) to terminal lugs
(1) Remove cover (para 3-26a).
(9).
(2) Disconnect springs (14) from terminal
(4) Install cover (para 3-26b).
lugs (9).
Section VI. CHASSIS ASSEMBLY (1A2A2)
tion to detector cell or detector cell ports
3-35. General
may break off in chassis assembly.
Direct support maintenance personnel are au-
f. While rocking detector cell (37) gently, pull
thorized to repair the M43 detector unit chassis
it directly from the chassis assembly (36).
assembly by replacing tubing, the separator as-
sembly, performed packing on the cell block
g. Remove bail (para 3-18a(4)).
assembly, fluid fittings, catches, and electrical
h. Unscrew plug (32, fig. 3-17). If air filter
contacts.
is not installed, insert air filter into AIR FIL-
TER slot in case top assembly (45) with black
3-36. Removal
side of filter material upward. Install and tighten
plug (32) .
a. Release four catches (10, fig. 3-16) and
separate detector unit assembly (1) from bot-
i. Remove three screws (42) and washers (43)
tom case assembly (2).
from three corners of chassis assembly (36).
WARNING
j. Unscrew four screws (39). Two will re-
Solution in the reservoir assembly is an
main in chassis (36).
irritant. Avoid contact with eyes and
k. Slightly separate chassis assembly (36)
mouth. Wash thoroughly with water.
from case top assembly (45). Disconnect tub-
b. Hold detector unit assembly (1) upright
ing (17, fig. 3-21 ) from heater assembly (33,
and unscrew reservoir assembly (41, fig. 3-17).
fig. 3-22) .
Al1ow weight assembly to hang down.
1. Disconnect connector (27).
CAUTION
m. Remove case top assembly (45, fig. 3-17).
Keep weight assembly free from dirt
after removing reservoir.
3-37. Installation
NOTE
a. Connect connector (27, fig. 3-23) to
Discard solution in reservoir assembly
1A2A2A5J2 (fig. 3-22).
in accordance with standing operating
b. Hold tubing (17, fig. 3-21 ) against tub-
procedures. Save reservoir.
ing (20) and partially insert shaft assembly (67)
c. Screw empty reservoir assembly (41) into
into mating hole in case top assembly (45, fig.
mounting hole in chassis (36).
3-17).
c. Connect tubing (17) to heater assembly
d. Loosen setscrew (8) and remove crank (9)
(33, fig. 3-22).
from its shaft.
d. Carefully insert chassis assembly (36, fig.
e. Turn lobed nut of bail (38) counterclock-
3-17) into case top assembly (45). Insure that
wise and swing bail away from detector cell
wires are not pinched and tubing (17, fig. 3-21
(37).
) is positioned against rounded side of foam
CAUTION
boss (halfmoon shaped, raised foam piece) in
Do not twist or exert excessive side mo-
case top assembly (45, fig. 3­17).
3-17

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