TM 55-2210-223-34
TO 45A2-2-14-22
3-24. POWER CONTACTOR (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
11.
Inspect molded parts for warpage, breaks, and cracks. Replace damaged parts.
12.
Inspect two stationary contacts (41) and movable contact (54) for wear. If alloy material is worn through to base
metal, replace stationary and movable contacts together.
13.
Inspect interlock housing (37) for wear. If contacts are burned or broken, replace interlock housing.
14.
Inspect magnet coil (59) for damaged insulation. Use a multimeter and measure resistance of magnet coil. If
resistance is not 120.0 ohms ( 10 %) or insulation is damaged replace coil.
15.
Replace damaged or loose terminals.
ASSEMBLY
16.
Assemble magnet assembly (33) by the following:
a.
Install spring washer (60) and magnet coil (59) on magnet bracket (61).
b.
Install pole plate (58) on magnet assembly (61). Secure with lockwasher (57) and screw (56).
17.
Assemble movable contact assembly (32) by the following:
a.
Install movable contact (54) on movable contact support (55). Secure with two lockwashers (53) and
allen-head screws (52).
b.
Install movable arcing tip (51) and hold-on iron (50) on movable contact support (55). Secure with
lockwasher (49) and screw (48).
c.
Install open-stop (47) in movable contact support (48).
18.
Assemble stationary contact assembly (30) by the following:
a.
Install two wipe springs (45) into tapered holes in top terminal (46).
b.
Install two pivot springs (44) over cone-shaped pins on top terminal (46), and install two pivot spring caps
(43) on pivot springs.
c.
Install spacer (42) with short leg of L between two pivot springs (44) and long leg between two wipe springs
(45).
d.
Install two stationary contacts (41) over two pivot springs (44) and two wipe springs (45).
e.
Install top stationary contact (40) and secure with two lockwashers (39) and allen-head screws (38).
3-81
