TM 5-4940-200-35
b. Removal of Components.
Refer to
figure 9 and
e. Installation. If the engine overspeed relay is
remove
the
engine
overspeed
relay
resistor,
removed from the shop set body, refer to
microswitch, solenoid, and terminal block.
TM 5-4940-200-12 and install it.
c. Cleaning, Inspection, and Testing.
f. Adjustment .
Refer to
figure 10 and adjust the
engine overspeed relay.
(1) Wash nonelectrical metal parts in an
approved cleaning solvent and dry
30. Engine Overspeed Relay, Model CMU-5
thoroughly.
(2) Inspect the microswitch for cracks and
a. Removal.
Refer to TM 5-4940-200-12 and
remove the engine overspeed relay resistor and
switch by placing the leads of a multimeter
switches.
at the switch terminal C and terminal NC.
When the reset button is depressed,
b. Cleaning, Inspection, and Testing.
continuity should not be indicated. When
(1) Wash nonelectrical metal parts in an
indicated.
Replace
a
defective
approved cleaning solvent and dry
microswitch.
thoroughly.
(3) Inspect the insulation plate, located
(2) Inspect the resistor for cracked and
between the microswitch and switch
broken insulation. Test the resistor with a
bracket, for cracks or breaks.
(4) Inspect the resistor for cracked or broken
ohms +10 percent. Replace a defective
insulation.
Test the resistor with a
resistor.
(3) Inspect the auxiliary relay switch for
ohms 10 percent. Replace a defective
cracks, breaks, or other damage. Test the
resistor.
switch coil with a multimeter.
(5) Inspect the solenoid for visible damage or
defects.
Connect
the
solenoid,
cent. Replace a defective auxiliary relay
momentarily, to a 40-volt direct current
switch.
power source. Solenoid should operate.
(4) Inspect the overspeed relay switch for
Replace a defective solenoid.
cracks, breaks, or other damage. Test the
(6) Inspect the terminal blocks for cracks or
breaks, loose or damaged terminal plates,
should be 6,000 ohms 10 percent.
and damaged terminal screws.
Replace a defective overspeed relay
(7) Inspect all electrical leads for damaged
switch.
terminal lugs and cracked or damaged
(5) Inspect all electrical leads for damaged
insulation.
terminal lugs and cracked or damaged
(8) Inspect the microswitch bracket for cracks
insulation. Replace all defective parts.
or breaks.
(9) Replace all defective parts.
c. Installation. Refer to TM 5-4940-200-12 and
(10) Inspect the overspeed relay box for
install the engine overspeed relay resistor and switches.
breaks, cracks, or other damage.
d. Adjustment. Refer to
figure 11 and adjust the
d. Installation of Components.
Refer to
figure 9
engine overspeed relay.
and install the engine overspeed relay resistor,
microswitch, solenoid, and terminal block.
24