2-66. LOW PRESSURE SWITCH MAINTENANCE.
This task consists of:
General Mechanics Tool Kit (Appendix B, Section III, Item 4)
Tape, Anti-seize (Appendix C, Section II, Item 30)
Lockwasher (2) MS35338-139
ROWPU shutdown (TM 10-4610-240-10).
Power shutdown (power source manual).
ROWPU piping drained (TM 10-4610-240-10).
a. Remove screws (9), lockwasher (8), and chain lug (7). Remove three screws (6) and lockwashers (5) Remove
cover (4), and gasket (3) from low pressure switch (18).
Tag all wiring before removal.
b. Remove screw (17) and wire lug (16).
c. Remove two screws (21), washers (20), and wire lugs (19).
d. Loosen sealing grip (2), and pull cable (22) and wires (23) from low pressure switch (18).
e. Disconnect pressure tube (10) from adapter (11).
f. Remove two nuts (12), lockwashers (13), screws (14), and low-pressure switch (18) from control panel (15).
g. Remove elbow connector (1) and adapter (11) from low pressure switch (18).
a. Apply anti-seize tape to male threads of adapter (11). Be sure tape is wrapped in same direction as pipe threads.
b. Install elbow connector (1) and adapter (11) on low-pressure switch (18).
c. Position low-pressure switch (18) on control panel (15) and install two screws (14), lockwashers (13), and nuts (12).
d. Connect pressure tube (10) to adapter (11).