TM 5-6115-593-12 TO 35C2-3-463-1 CAUTION Do     not     clean     in     gasoline     or     other petroleum products. (a)   Compressed Air. Direct compressed   air   (100   psi   max) through  filter  element  opposite airflow direction. (b)   Washing   with   Water.   Soak   15 minutes     in     water     with     mild deter-  gent.    Rinse  until  clean. Air dry.  Do not use compressed air. (7) Replace defective gaskets or O-rings. (8) Replace   primary   filter   element   (4), gasket  (2),  secure  with  wing  nut  (3), and    secure    cover    (1)    with    cover latches. (9) Reset service indicator to green. c.   Replacement of Air Cleaner Element.  Refer to paragraph b, above. d. Replacement   of   Indicator.      Remove   the indicator  (28,  figure  4-23)  by  unscrewing  it from the air cleaner assembly.  Screw a new indicator in place. e.   Replacement of Air Cleaner. (1) Be sure hose clamps (24) are in their proper  location  as  shown  in  figure  4- 23. (2) Attach   air   cleaner   (29)   to   mounting brackets  (18  and  19)  with  six  screws (15), lockwashers (17) and nuts (16). (3) Attach    hoses    to    air    cleaner    and tighten hose clamps (24). 4-43.  AIR SHUT-OFF VALVE.  (27, figure 4-23.) a.   Inspect (1) Check     all     lead     wires     for     secure connection. (2)   Check springs, shafts, and mountings for security, mechanical defects (stretched   springs,   bent   shafts),   and freedom from binding. b.   Test (1)   Tag    and    disconnect    lead    wires    to valve. (2)   Valve is normally open. Trip valve by applying  24V  DC  across  leads:  valve should close. (3)   Remove 24V DC; valve should open. c.   Replacement. (1)   Tag and disconnect lead wires. (2)   Loosen  clamps  (24)  at  either  end  of valve (27). (3)   Remove   mounting   screws   (30)   and nuts  (31)  which  hold  valve  to  bracket (22 and 23). (4)   Remove valve (27) by sliding adapter hose   (26)   and   then   duct   hose   (25) away from valve. (5) Install  valve  (27)  by  sliding  one  end into adapter hose (26), other into duct hose (25). (6)   Secure  to  bracket  (22  and  23)  using mounting screws (30) and nuts (31). (7)   Tighten  clamps  (24)  at  either  end  of valve. (8)   Connect  lead  wires  and  remove  wire tags. 4-44.  DUCTS AND HOSES. a.   Inspect. (1) Loosen  clamps  (24)  holding  adapter hose (26). (2) Check inside hose for accumulation of dirt. 4-73