TM 55-4920--217-15
Section IV. TROUBLESHOOTING
89. Use of Troubleshooting Section
93. Electrical Equipment Will Not Start
This section contains troubleshooting information
Probable cause
Possible remedy
useful to second echelon personnel in diagnosing and
correcting unsatisfactory operation or failure of the shop
Power cord discon-
set or any of the components.
nected. ----------------------- Check rear power outlet for
proper installation of power
cord from auxiliary power
90. Procedure
source.
Troubleshooting is a systematic isolation of defective
One or more circuit
components by means of an analysis of the shop set
breakers inoperative. ----- Check circuit breakers and
trouble symptoms, testing to determine the defective
replace as necessary.
component, and applying the remedies. To correct
Corroded prong .or loose
malfunctioning of equipment, the probable cause should
connection at power re-
be systematically isolated in accordance with instructions
ceptacle. --------------------- Clean prong and check
in the following paragraphs.
connectors and plug for
tightness.
91.
Electrical Equipment Operates at Slow or
Cause beyond repair
Reduced Speed
scope of operator. --------- Notify
supporting
field
Probable cause
Possible remedy
maintenance unit.
Loose connectors. ----------- Tighten connectors.
Low voltage.------------------- Check incoming voltage.
94. Pneumatic Equipment Operates at Slow
Improper source of
or Reduced Speed
voltage. ---------------------- Check source voltage for
Probable cause
Possible remedy
specified requirements.
Low air pressure. ------------- Check air pressure gages,
Cause beyond repair
and regulators; adjust as
scope of operator.--------- Notify
supporting
field
necessary.
maintenance unit.
Leak in air line(s)
or loose connector(s). ---- Check air pressure at
92. Electrical Equipment Stops During Operation
equipment;
retrace
air
Probable cause
Possible remedy
line(s); check for leaks and
Power source discon-
loose connector(s).
nected. ----------------------- Check external power cable,
Cause beyond repair
cords, and circuit breakers.
scope of operator. ........... Notify
supporting
field
Overheating of
maintenance unit.
equipment. ------------------ Check equipment for speed
setting and voltage as
95. Pneumatic Equipment Stops During
necessary.
Allow
Operation
equipment to cool and
Probable cause
Possible remedy
restart.
Overloading. ------------------ Adjust feed or speed of
Failure of source of
equipment as necessary.
power. ------------------------ Check incoming auxiliary
Cause beyond repair
line for pressure.
scope of operator.--------- Notify
supporting
field
Overloading.------------------- Reduce feed, pressure on
maintenance unit.
work,
or
speed
as
necessary.
Cause beyond repair
scope of operator. --------- Notify
supporting
field
maintenance unit.
96. Pneumatic Equipment Will Not Start
Probable cause
Possible remedy
Source of power discon-
nected. ----------------------- Check connections at points
of installation.
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