TM 55-4920-213-15
Section IV. TROUBLESHOOTING
Probable cause
Possible remedy
One or more circuit
This section contains troubleshooting infor-
breakers inoperative
Check circuit breakers and
mation useful to second echelon personnel in
replace as necessary.
Safety switch inoperative.
Replace safety switch.
diagnosing and correcting unsatisfactory op-
Corroded prong or loose
eration or failure of the shop set or any of the
connection at power re-
components.
ceptacle.
Clean prong and check
connectors and plug for
94. Procedure
tightness.
Cause beyond repair scope
Troubleshooting is a systematic isolation of
of operator.
Notify supporting field
defective components by means of an analysis
maintenance unit.
of the shop set trouble symptoms, testing to
98. Pneumatic Equipment Operates at
determine the defective component, and apply-
Slow or Reduced Speed
ing the remedies. To correct malfunctioning
Possible remedy
Probable cause
of equipment, the probably cause should be sys-
Low air pressure
Check air pressure gages,
tematically isolated in. accordance with instruc-
and regulators; adjust as
tions in paragraphs 95-102.
necessary.
Leak in air line(s) or loose
connector(s).
Check air pressure at
equipment; retrace air
Slow or Reduced Speed
line (s); check for leaks
Possible remedy
Probable. cause
and loose connector(s).
Cause beyond repair scope
Tighten connectors
Loose connectors
of operator
Notify supporting field
Low voltage.
Check incoming voltage.
maintenance unit.
Improper source of
voltage
Check source voltage for
99. Pneumatic Equipment Stops
epecified requirement.
During Operation
Cause beyond repair scope
of operator.
Notify supporting field
Probable cause
Possible remedy
maintenance unit.
Failure of source of
Check compressor for
power
96. Electrical Equipment Stops During
operation; check incoming
Operation
auxiliary line for pres-
sure.
Possible remedy
Probable cause
Overloading
Reduce feed, pressure on
Power source disconnected. Check power source, exter-
work, or speed as neces-
nal power cable, cords
sary.
and circuit breakers.
Cause beyond repair scope
Overheating of equipment._Check equipment for speed
of operator
Notify supporting field
setting and voltage as
maintenance unit.
necessary. Allow equip-
100. Pneumatic Equipment Will Not Start
ment to cool and restart.
Overloading.
Adjust feed or speed of
Probable cause
Possible remedy
equipment as necessary.
Source of power dis-
Cause beyond repair scope
connected
Check connections at points
of operator.
Notify supporting field
of installation.
maintenance unit.
Faulty check valves.
Check air pressure at
regulators; replace check
97. Electrical Equipment Will Not Start
valves as necessary.
Break in air hose of
Probable cause
Possible remedy
equipment
Check air hose and replace
Power cord disconnected
Check rear power outlet. for
as necessary.
proper installation of
Cause beyond repair scope
power cord from auxiliary
of operator
Notify supporting field
power source.
maintenance unit.
