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 (d) Installation is in reverse order of removal.
(b) Remove screw (6) and arc horn (8), and lift off
stationary contact (10).
d. Main Line Contactor.
(c) Disconnect pigtail from terminal post (36),
(1) The main line contactor assembly is the same as
remove cotter pin, cup washer, and contact spring (13); and
that of the accelerating contactor (c. above), with the
lift off movable contact (12).
exception that it is a two-pole contactor.
(d) Installation is in reverse order of removal.
(2) Replacement of contacts (c. (1) above).
(2) Replacement of relay coil as follows:
(3) Replacement of relay coil (c. (2) above).
(a) Disconnect pigtail from terminal post (36),
e. Overload Relay.
remove cotter pin (15), cup washer (14), and armature return
(1) Remove screw (10, fig. 5-73) from each end of
spring ( 19) . Lift off armature assembly (16).
thermal unit (11) and slip off unit. Installation is in reverse
(b) Disconnect coil leads at clamp (29) on each side
order of removal. Tighten screws securely.
of the coil.
(c) Loosen screw (31) and remove pole face (32).
Slide coil forward from magnet coil.
1.
Contact, stationary
7.
Tie bar and slider stop
2.
Reset and slider
8.
Guide pin
3.
Contact, movable
9.
Spring
4.
Spring
10.
Screw
5.
Cotterpin
11.
Thermal unit
6.
Screw
12.
Stud
Figure 5-73. Overload Relay.
(2) Replace latch spring as follows:
(a) Remove reset and slider assembly ((2) (b)
(a) Remove thermal unit.
above). Remove cotter pin (5), spring (4), and contact (3).
(b) Loosen screws (6) holding tie bar and slider stop.
Installation is in reverse order of removal.
Remove reset and slider assembly (2) along with tie bar and
(b) Remove panel from controller inclosure. Trip
slider stop.
thermal unit using slider latch. Remove nut holding stationary
(c) Remove latch spring (9) from slider assembly and
contact (1), then unscrew stud (12) from panel. Lift off
tie bar and slider stop.
contact. Installation is in reverse order of removal.
(3) Replace contacts and springs as follows:
5-36. Fire Pump
a. General Description. The pump is a single
5-97
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