TM 9-4120-407-14
4-42. SAFETY CONTROL BOX (PRESSURE SWITCHES) TESTING AND REPLACEMENT. (Cont)
Figure 4-14. Pressure Cutout Switches (S5) and (S6)
(g) Remove clip (10) and cover (9).
( h ) Press and release the reset button (11).
If no continuity is indicated, high pressure switch (7) must be replaced.
(2) Low Pressure Switch.
( a ) Manifold gauge should read above 12 psig (83 kPa). If readings are below 12 psig (83 kpa),
(b) Remove six screws (1), lock washers (2), and flat washers (3). Discard lock washers.
(c) Carefully pull safety control box (4) out far enough to access screws (5).
(d) Remove four screws (5) and carefully pull panel (6) out to access low pressure switch (13).
(e) Remove two screws (14).
(f) Carefully pull low pressure switch (13) out far enough to gain access to cover (15).
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