TM 9611534
NAVFAC P-634
5-23. LOAD CIRCUIT BREAKER CBIOI REPLACEMENT. Refer to paragraph 2-17.
5-24. LOADCIRCUIT BREAKERCBIOI REPAIR. Repair of load circuit breakerCB101 is accomplished by
disassembling the breaker to the extent necessary to remove and replace defective parts. If a vacuum interrupter is
being replaced, the alignment procedures of paragraph 5-22 must be performed. The return spring assembly (67, Figure
5-19) and two drive springs and shaft assemblies (110) are to be repaired by replacement of the entire assembly if
damage to individual components is detected. If the return spring assembly is replaced, the primary contact gap must be
set as specified in paragraph 5-22, step c. All of the adjustment procedures of paragraph 5-21, above, must be
performed after any disassembly and reassembly. Additionally, load circuit breaker CB1 01 must be lubricated in
accordance with Table 5-1 during and or after reassembly.
WARNING
Dry cleaning solvent PD-680, Type III, or equivalent, Is flammable and moderately toxic to the
skin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratory tract
protection Is required to avoid Injury to personnel.
a.
Clean.
Clean all parts in solvent PD-680, Type III, or equivalent, as necessary.
b.
Inspect As parts are removed during disassembly, inspect them for cracks, breaks, or damage. Replace any parts
which are damaged or visibly worm.
c.
Disassemble.
See Figure 5-1 9.
(1)
Remove front cover (1) by removing four bolts (2), and lockwashers (3), and washers (4).
(2)
Remove four bolts (5), lockwashers (6), and washers (7) to remove floor trip pan assembly (8). Tag and
disconnect wires, then remove bolts (9), lockwashers (10), and washers (11) to remove bracket (12) and
solenoid assembly (13).
(3)
While supporting interrupter module assembly (14), remove nuts (15), and washers (16) to remove
mechanism left and right shield assemblies (1 7). Reinstall nuts (15), and washers (16).
(4)
To remove phase insulator assembly (18), remove four bolts (19), lockwashers (20), and washers (21) at
bottom rear; four bolts (22), lockwashers (23), and washers (24) from front; and six bolts (25), lockwashers
(26), and washers (27) through rear brace (28). Remove four bolts (29), lockwashers (30), and washers (31)
securing ends of rear brace (28). Remove rear brace (28) and remove phase insulator (18).
NOTE
Phase A and Phase C interrupter module assemblies are retained by slightly longer bolts (38).
These bolts are also used to secure the shield assemblies.
(5)
In order to free pivot wing assembly (32), remove cotter pin (33), connecting pin (34), and washers (35, 36,
and 37). Remove six bolts (38 and 39), lockwashers (40), washers (16), and nuts (15)) to remove each
interrupter module assembly (14).
(6)
Remove capscrews (41) and flat washers (42) to remove primary disconnect finger (43) and primary
disconnect spring (44) assemblies.
(7)
Remove bolt (45), flat washer (46), brass bushing washer (47), eccentric roller (48), and brass bushing
washer (49). Insert bolt (45) into motor eccentric (50), tap lightly and turn motor eccentric (50) clockwise to
remove motor eccentric (50) from motor (51). Remove bushing (52) and drive lever bushing housing (53).
(8)
Remove bolts (54) and lockwashers (55) to remove motor access plate (56). Tag and disconnect wires and
remove spring charge motor assembly (51).
(9)
Remove bolts (57), washers (58 and 59), nuts (60), and unhook spring (61) to remove counter assembly
(62).
(10)
Remove bolts (63), nuts (64), and washers (65) to remove main shaft removal inserts (66).
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