TM 5-4310-375-14
4-15. Motor control box and starter assembly. Maintenance of the control box and starter assembly is as follows:
a. Removal/Disassembly. Remove and disassemble to the extent necessary to perform repair or replacement in
following sequence.
WARNING
Electricity is dangerous. Before performing any maintenance or adjust-
ments, be sure the electrical power is turned off. Never depend on the
ON-OFF switch. Turn power off at the source.
(1) Turn main power OFF at the source. Turn ON-OFF switch (2, figure 4-3) to OFF position. Loosen
control box cover clamp screws, move clamps from door lip and open control box door.
(2) Disconnect and tag all wires for reassembly reference.
(3) Unscrew and remove mounting nut of reset button and remove the reset button (1).
(4) Unscrew and remove mounting nut of ON-OFF switch; remove the switch (2) and legend plate (3).
(5) Remove four screws (4) and lift starter assembly (9) and mounting panel (8) out of control box. Remove
three nuts (5), lockwashers (6) and screws (7). Separate starter assembly (9) from mounting panel (8).
(6) To gain access to coil (13), unscrew the two captive cover screws (A) and remove cover (10). Tilt the top of
the armature (11) away from the coil and slide armature (11) up and out. Remove spring plate (12) and pull
coil (13) straight out.
(7) To remove the three heater coils (14), remove terminal screws securing the coil ends and lift coils (14) off
overload relay. Install terminal screws to prevent their loss until ready for reassembly.
(8) To gain access to movable and stationary contacts (16, 20) it is not necessary to remove parts (10 through
14). Simply, unscrew the captive hex head slotted screws (B) and pull out the power unit (15).
NOTE
The power unit (15) consists of a factory assembly of all the magnetic
parts, movable contacts, and their carrier assembly. This unit usually
permits immediate restoration to service of a device which may have
become inoperative. A set of stationary contacts is included with a new
power unit assembly. It is advisable to install these stationary contacts
at the same time, particularly if visual inspection indicates contacts need
replacement. Also, a set of contacts (21) is available for parts replace-
ment, see TM 5-4310-375-24P.
CAUTION
The power contacts should not be filed or dressed, they should be
replaced.
(9) To remove movable contacts (16), depress one end of the contact and push the contact out as shown in
Sketch "A". Remove the springs (18) and retainers (17).
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