TM 55-4920-217-15
b. Inspection. Inspect for nicks, scratches, gouges,
141. Bench Top, Sizes A, B, C, and D
condition, and wear. Repair or replace as necessary.
a. Repair.
Fabrication and assembly of
components which may be required for repair and
replacement will be on an "as required" basis.
Section IV. TROUBLESHOOTING
142. General
Probable cause
Possible remedy
External power receptacle
This section contains troubleshooting information useful
inoperative ............................. Replace receptacle.
to field and depot maintenance personnel in diagnosing
Power cord broken .................... Repair or replace power
and correcting unsatisfactory operation or failure of the
cord.
shop set or any of its components.
Circuit breakers burned
out. ........................................ Replace
circuit
143. Procedure
breakers.
Safety disconnect switch
Troubleshooting is a systematic isolation of
contacts corroded................... Clean contacts.
defective components by means of an analysis of the
shop set trouble symptoms, testing, to determine the
147. Pneumatic Equipment Operates at
defective component, and applying the remedy. To
Slow or Reduced Speed
correct malfunctioning of equipment, the probable cause
should be systematically isolated in accordance with
instructions in the following paragraphs.
Probable cause
Possible remedy
Partial stoppage in air
144. Electrical Equipment Operates at Slow
lines or hose. Remove obstruction from air line or hose.
Damaged air line Replace air line.
or Reduced Speed
Controls stuck Repair or replace controls.
Probable cause
Possible remedy
148. Pneumatic Equipment Stops During
Internal break in con-
Operation
ductor inside conduit. ............. Remove
wire
from
conduit; splice or
replace.
Probable cause
Possible remedy
Improper grounding. .................. Inspect for corrosion at
Obstruction in the air lines_ Remove obstruction.
ground
connection-
Broken air lines
Replace line.
repair or replace as
necessary.
149. Pneumatic Equipment Will Not Start
Contact points of cir-
cuit breaker dirty or
Clean points, reinstall
Probable cause
Possible remedy
cir-
Power source not
corroded. ............................... cuit breaker.
functioning correctly. ............ Refer to power source
Improper connections in
Check control panel;
technical manual for
re-
procedure.
control panel. ......................... position leads (fig. 8).
Check valves inopera-
tive. ..................................... Repair
or
replace
145. Electrical Equipment Stops During
check valves.
Operation
Control stuck ........................... Repair
or
replace
controls.
Probable cause
Possible remedy
Broken power cord. ................... Remove power cord;
150. Excessive Vibration of Equipment
inspect, repair, or
replace.
Probable cause
Possible remedy
Circuit breaker
Broken mountings. .................... Replace mountings,
burned out.............................. Replace
circuit
Equipment improperly
breakers.
mounted................................. Remount
equipment
correctly.
146. Electrical Equipment Will Not Start
100