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TM 10-4320-351-14
5.7.3 Repair Emergency Stop Switch (S4). (Refer to figure 5-12.)
The emergency stop switch is a four part component, as shown: a spring loaded operator (red button), a mounting base
and two contact blocks. When mounted on the control panel, these parts form a double pole, normally closed switch.
Depressing the operator (red button) opens both switch sections. The physical configuration of the operator (red button)
and the mounting base causes the operator (red button) to latch when depressed, holding the parallel switch sections in
the open position. Rotating the operator in the direction of the arrows releases it from the latched position and allows the
switches in the contact blocks to close.
The contact blocks are the most likely electrical failure, but the operator (red button) is subject to physical abuse and also
may have to replaced. The four parts can be replaced individually.
This task consists of:
a. Removal
b. Installation
INITIAL SET-UP:
Tools:
Materials/Parts Required:
Screwdriver, Cross Tip, #2
Solder (Appendix F, Section II, Item 6)
(Appendix B, Section III, Item 3)
Flux, Soldering (Appendix F, Section II, Item 7)
Screwdriver, Flat Blade, 3/16" x 4"
Strap, Tiedown (Appendix F, Section II, Item 8)
(Appendix B, Section III, Item 3)
Strap, Tiedown (Appendix F, Section II, Item 19)
Soldering Iron, Pencil Tip, 700°F
Tags, Electrical (Appendix F, Section II, Item 16)
(Appendix B, Section III, Item 3)
General Safety Requirements:
Equipment Condition:
Accessory module removed from system.
(para. 2.9)
a.
Removal.
(1)
Remove the twenty-four screws (1) and flat washers (2) that secure the control panel (3) to the control box.
(2)
Lift the control panel (3) from the control box and set on edge convenient to emergency stop switch S4.
(3)
Tag the wires associated with the contact block(s) (4) to be removed.
(4)
On the contact block (4), loosen the wire terminal retaining screws (5) and pull the terminals (6) from the
contact block.
(5)
Desolder terminals (6) from wires.
(6)
Loosen the contact block (4) retaining screw (7) and remove the contact block (4).
(7)
Loosen the two compression screws (8) on the mounting base (9); rotate and remove the mounting base
from the operator (red button) (10).
(8)
Lift operator (red button) (10) clear of the control panel (3).
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