TM 55-4920-215-15
Section IV. TROUBLESHOOTING
Probable cause
Possible remedy
92. Use of Troubleshooting Section
This
section
contains
troubleshooting
One or more circuit break-
information useful to second echelon personnel in
ers inoperative ..............................Check circuit breakers and
diagnosing and correcting unsatisfactory operation or
replace as necessary.
failure of the shop set or any of the components.
Safety switch inoperative.
Replace safety switch.
Corroded prong or loose
connection at power re-
93. Procedure
ceptacle .......................................Clean prong and check con-
Troubleshooting is a systematic isolation of
nectors and plug for tight-
defective components by means of an analysis of the
ness.
Cause beyond repair scope
shop set trouble symptoms, testing to determine the
of operator ....................................Notify supporting field
defective component, and applying the remedies. To
maintenance unit.
correct malfunctioning of equipment, the probable cause
should be systematically isolated in accordance with
97. Pneumatic Equipment Operates at
Slow or Reduced Speed
94. Electrical Equipment Operates at Slow
Probable cause
Possible remedy
or Reduce Speed
Low air pressure ...............................Check air pressure gages
and regulators; adjust as
Probable cause
Possible remedy
necessary.
Leak in air line (a) or
Loose connectors ............................ Tighten connectors.
loose connector (s) ........................Check air pressure at equip-
Low voltage ...................................... Check incoming voltage.
ment; retrace air line(s);
Improper source of voltage ............. Check source voltage for
check for leaks and loose
specified requirements.
connector(s).
Cause beyond repair scope
Cause beyond repair scope
of operator ........................................... Notify supporting field
of operator ....................................Notify supporting field
maintenance unit.
maintenance unit.
95. Electrical Equipment Stops During
98. Pneumatic Equipment Stops During
Operation
Operation
Probable cause
Possible remedy
Probable cause
Possible remedy
Power source disconnected ............. Check generator, external
Failure of source of power.................Check power source for
power cable, cords, and
operating; check incom
circuit breakers.
ing auxiliary line for
Overheating of equipment- ............... Check equipment for speed
pressure.
setting and voltage as
Overloading.......................................Reduce feed, pressure on
necessary Allow equip-
work, or speed as neces-
ment to cool and re-start.
sary.
Overloading ...................................... Adjust feed or speed of
Cause beyond repair scope
equipment as necessary.
of operator.....................................Notify supporting field
Cause beyond repair scope
maintenance unit.
of operator .................................... Notify supporting field
maintenance unit.
99. Pneumatic Equipment Will Not Start
96. Electrical Equipment Will Not Start
Probable cause
Possible remedy
Probable cause
Possible remedy
Source of power disconnec-
ted ................................................Check connections at points
Power cord disconnected ................ Check rear power outlet for
of installation.
proper installation of
Faulty check valves ..........................Check air pressure at regu-
power cord from genera-
lators; replace cheek
tor or auxiliary power
valves as necessary.
source.
Break in air hose of equip-
ment ............................................Check air hose and replace
as necessary.
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