(3) Remove retaining ring (32).
latch raised, over mounting holes in pump unit
(4) Remove roller (31 ).
(2) Install and tighten screws (27).
(1) Install roller (31) on its shaft.
(2) Install retaining ring (32) in notch of
(3) Connect springs (14) to terminal lugs
(2) Disconnect springs (14) from terminal
Section VI. CHASSIS ASSEMBLY (1A2A2)
tion to detector cell or detector cell ports
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
is not installed, insert air filter into AIR FIL-
TER slot in case top assembly (45) with black
side of filter material upward. Install and tighten
plug (32) .
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).
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,
Al1ow weight assembly to hang down.
1. Disconnect connector (27).
Keep weight assembly free from dirt
after removing reservoir.
Discard solution in reservoir assembly
in accordance with standing operating
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).
c. Connect tubing (17) to heater assembly
d. Loosen setscrew (8) and remove crank (9)
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
) is positioned against rounded side of foam
boss (halfmoon shaped, raised foam piece) in
Do not twist or exert excessive side mo-