3.12.5 NBC Filter Replacement.
This task covers:
7/16 Inch Socket (Item 6, Appendix B, Section III)
Power shut off, power panel and rear control panel
Socket Wrench Handle (Item 5, Appendix B, Section
ECV parking brake set.
6 Inch Extension (Item 3, Appendix B, Section III)
ECU work platform installed (see para 3.12.1).
Air intake cover removed (TM 9-2320-387-10).
Three NBC Filters (81361) 5-19-7435
Nine Lockwashers (96906) MS35338-139
To prevent death or injury to personnel from contamination, wear full MOPP gear when
handling contaminated NBC filter. Dispose of NBC filter in accordance with NBC guidelines
(refer to FM 3-11.5).
a. Removal (Refer to Figure 3-8)
Ensure weather cap on air intake duct is removed before replacing NBC filters. Make note of
where the cap is positioned. If cap is pushed to far on to the air intake duct, airflow will be
restricted and will cause problems starting ECU.
Release latches and open bottom front door assembly on ECU.
Using 7/16 inch deep well socket (Item 8, Appendix B), remove seven nuts (1), seven
lockwashers (2) and seven flat washers (3) securing plenum (4) to seven rods (5). Discard seven
Remove two nuts (6), two lockwashers (7) and two flat washers (8) securing plenum (4) to two
rods (9). Discard two lockwashers (7).
Remove plenum (4) from seven rods (5) and two rods (9).
NBC filter weighs 30 pounds. To prevent injury to personnel, use proper lifting techniques
when handling NBC filter.
Slide three NBC filters (10) from three channels in ECU (11).
Dispose of three NBC filters (10) in accordance with NBC guidelines per FM 3-11.5.