TM 55-4920-215-15
Section IV. TROUBLESHOOTING
Power cord broken .............Repair or replace power
143. General
cord.
This
section
contains
troubleshooting
Circuit breakers burned
information useful to field and depot maintenance
out ...................................Replace circuit breakers.
personnel in diagnosing and correcting unsatisfactory
Safety disconnect switch
operation or failure of the shop set or any of its
contacts corroded ............Clean contacts.
components.
148. Pneumatic Equipment Operates at Slow or
144. Procedure
Reduced Speed
Troubleshooting is a systematic isolation of
Probable cause
Possible remedy
defective components by means of an analysis of the
shop set trouble symptoms, testing to determine the
Partial stoppage in air line
defective component, and applying the remedy. To
or hose ............................Remove obstruction from
correct malfunctioning of equipment, the probable cause
air line or hose.
should be systematically isolated in accordance with
Damaged air line ................Replace air line.
instructions in the following paragraphs.
Controls stuck ....................Repair or replace controls.
145. Electrical Equipment Operates at Slow or
149. Pneumatic Equipment Stops During Operation
Probable cause
Possible remedy
Reduced Speed
Obstruction in air lines ........Remove obstruction.
Probable cause
Possible remedy
Broken air lines . .................Replace line.
Internal break in conduc-
Remove wire from conduit;
tor inside conduit.
150. Pneumatic Equipment Will Not Start
Improper grounding ............Inspect for corrosion at
ground connections-re-
Probable cause
Possible remedy
pair or replace as neces
Power source not function-
sary.
ing correctly ....................Refer to power source TM
Contact points of circuit
for procedure.
breaker dirty or
Check valves inoperative ....Repair or replace check
corroded .........................Clean points, reinstall cir-
valves.
cuit breaker.
Controls stuck ....................Repair or replace controls.
Improper connections in
control panel ...................Check control panel; posi-
151. Excessive Vibration of Equipment
Probable cause
Possible remedy
Broken mountings ...............Replace mountings.
146. Electrical Equipment Stops During Operation
Equipment improperly
Broken power cord
Remove power cord;
mounted ..........................Remount equipment cor-
inspect, repair, or replace.
rectly.
Circuit breaker burned
152. Excessive Noise
out ...................................Replace circuit breaker.
Probable cause
Possible remedy
Short circuit in system ........Check system with voltohm
Mountings not secure .........Re-position and secure
meter; repair short cir-
mounts.
cuit.
Equipment assembled im-
properly ........................... Reassemble correctly.
147. Electrical Equipment Will Not Start
Probable cause
Possible remedy
External power receptacle
inoperative ......................Replace receptacle.
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