TM 9-2320-280-20-2
4-100. NBC CONTROL BOX AND WIRING HARNESS REPLACEMEN (M997, M997A1,
M997A2) (Cont’d)
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
Remove three nut and lockwasher assemblies (19), screws (13), and cover (18) from body (14).
Discard nut and lockwasher assemblies (19).
Remove two screws (20), clamps (21), harness (11), and intercom cable (12) from body (14).
Remove screw (7) and lead (9) from heater and filter assembly (10).
Remove two nut and lockwasher assemblies (17), screws (15), clamps (16), harness (11), and intercom
cable (12) from body (14). Discard nut and lockwasher assemblies (17).
Disconnect connector (8) from heater and filter assembly (10).
Remove grommet (23) and harness (11) from body (14).
Remove screw (25), clamp (24), and harness (11) from body (14).
Remove two screws (5) and cover (26) from bracket (4). Pull cover (26) away from switch (3) to allow
access to leads.
Remove two screws (27), lockwashers (1), and leads (2) and (6) from switch (3). Discard lockwashers (1).
Remove harness (11) from grommet (22) and route harness (11) through opening in body (14).
Remove two screws (39), washers (38), retainer (37), grommet (36), harness (11), and intercom
cable (12) from body (14).
Remove six tiedown straps (40) from NBC heater leads (34) and harness (11). Discard
tiedownstraps (40).
Disconnect leads 786B (45), 787A (44), and 787B (41) from NBC connectors (42).
Remove four screws (28), lockwashers (29), washers (30), and mounting bracket (31) from brackets (32).
Pull bracket (31) away from body (14) to allow access to ground leads hardware. Discard lockwashers (29).
Loosen three hose clamps (49) and pull heaters (47) from fittings (48).
Remove three nuts (35) and ground leads (34), (43), and (46) from capscrews (33).
Remove harness (11) from vehicle.
b. Installation
CAUTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
4-206
Use care when routing harness. Failure to do so will cause
damage to harness.
Route harness (11) through vehicle in approximate mounting location.
Install leads (34), (43), and (46) on three capscrews (33) with nuts (35).
Connect three heaters (47) to fittings (48) and tighten clamps (49).
Install mounting bracket (31) to brackets (32) with four washers (30), lockwashers (29), and screws (28).
Connect leads 786B (45), 787A (44), and 787B (41) to NBC heater connectors (42).
Install six tiedown straps (40) on NBC heater leads (34) and harness (11).
Install grommet (36), retainer (37), harness (11), and intercom cable (12) on body (14) with washers
(38) and screws (39).
Route harness (11) through grommet (22) and opening in body (14).
Install leads (2) and (6) on switch (3) with two lockwashers (1) and screws (27).
Install cover (26) over switch (3) on bracket (4) with two screws (5).
Install clamp (24) and harness (11) on body (14) with screw (25).
