(2) Tag and disconnect electrical leads to
(13) Discard gaskets (20, 14, and 13) and
(3) Disconnect wiring harness connector
(14) Repair minor thread damage to parts
from main load contactor connector.
using thread chaser. Discard hardware with thread
(4) Remove nuts (5) and screws (6) to remove
main load contactor.
(15) Remove minor pitting from contact sur-
faces of bridge assemblies with fine grit abrasive
paper or a fine file. Replace bridge assemblies if
(1) Thoroughly clean the exterior of the con-
tactor with a clean, lint-free cloth moistened with
(16) Replace any parts found defective or dam-
an approved solvent. Blow dust and dirt from
aged beyond repair.
crevices with compressed air.
(2) Disassemble main bad contactor in order
of the ascending sequence of index numbers (7 thru
(1) Assemble core and frame (83), coil washer
(84), and coil (85).
Cleaning, Inspection, and Repair.
(2) Install end plate (86) and loosely install
(1) Clean all parts with a clean, lint-free cloth
moistened with an approved solved.
(3) Secure terminals (77) to auxiliary operator
(73) with lockwashers (76) and nuts (75).
(2) Check terminal covers (4) and housing (15)
for cracks, breaks, and other damage.
(4) Install adhesive back spacer (78) (adhesive
side up) over core and rod (79).
(3) Inspect chamber base (19), main base (46),
and main contact operator (31) for cracks, breaks,
(5) Secure core and rod to auxiliary Operator
and other damage.
with nut (71) and lockwasher (72).
(4) Inspect bridge assembly (25) for pitting,
(6) Insert guide rods (70) through auxiliary
corrosion, and other damage.
operator (73) and install return springs (74).
(5) Inspect contact assembly (38) for burns,
(7) Thread guide rods into core and frame (83)
corrosion, melting and other damage.
unti1 a sufficient length extends out the bottom to
loosely install lockwashers (69) and nuts (68).
(6) Inspect auxiliary operator (73) for cracks,
(8) Install the economizing switch (63) onto
(7) Check core and rod (79), core and frame
(83), bracket assembly (60), and end plate (86) for
cracks, breaks, and other damage.
(9) Loosely secure bracket (67) to core and
(8) Check coil (85) for swelling of encapsu-
lated material, burns, and evidence of corrosion.
and screws (64).
(10) Fit bracket (60) over economizing switch
(9) Check economizing switch (63) for cracks,
and secure to auxiliary operator (73) with screw (59),
corrosion, burns, and evidence of shorting.
flat washer (58), lockwashcr (57), and nut (56).
(10) Check contacts of contact assemblies
(11) Adjust assembled actuator assembly as
(53 and 54) for corrosion, pitting, burns, and other
(a) Install a suitable clamp across points
(11) Check connector and wire assembly for
(A) and (B) of actuator assembly. Tighten clamp
cracks, stripped or otherwise damagcd threads,
sufficiently to insure that no air gap exists at points
burned or chaffed insulation, bare wires and other
(C) and (D).
or repair wire and connector damage.
(b) Tighten loosely installed screws (l).
(12) Check all threads for crossing, stripping,
peening, and other damage.
(c) Remove clamp.