TM 9-2320-280-20-2
4-100. NBC CONTROL BOX AND WIRING HARNESS REPLACEMENT (M997, M997A1,
M997A2) (Cont'd)
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
4-204
Remove two tiedown straps (6). Disconnect leads 784A (4) and 784B (12) from NBC heaters (1).
Discard tiedown straps (6).
Remove four capscrews (3), washers (2), and mounting bracket (16) from body (14). Pull
bracket (16) and NBC heaters (1) away from body (14) to allow access to ground leads (5) hardware.
Remove nut (13), capscrew (15), and ground terminals (5) from NBC heaters (1).
Remove screw (9), lockwasher (10), clamp (11), and harness (7) from A/C control box (8) and body (14).
Remove clamp (11). Discard lockwasher (10).
Route harness (7) through body (14) into cab.
Remove two screws (26), clamps (25) and harness (7) from body (21).
Disconnect harness lead 785A (35) from NBC heater lead (36).
Remove locknut (29), washer (30), capscrew (32), washer (30), and leads 796 and 796A (31) from
NBC heater (33). Discard locknut (29).
Remove five screws (27), clamps (28), harness (7), and intercom cable (24) from body (21). Remove
clamps (28).
Remove tiedown straps (19) and (34). Disconnect harness lead 786A (40) from NBC heater lead (41).
Discard tiedown straps (19) and (34).
Remove locknut (43), washer (17), capscrew (18), washer (17), and leads 796B and 796A (42) from
NBC heater (44). Discard locknut (43).
Remove two nut and lockwasher assemblies (20), capscrews (37), washers (38), clamp (39),
grommet (22), retainer (23), harness (7), and intercom cable (24) from body (21). Discard nut and
lockwasher assemblies (20).
