Safety Precautions; Routine And Periodic Maintenance - Lincoln Electric IDEALARC SP-255 Service Manual

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SAFETY PRECAUTIONS

WARNING
• Have a qualified technician do the maintenance
and troubleshooting work.
• Disconnect input power at main input supply
prior to working inside machine.
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Read the Safety Precautions in the front of this manual
before working on this machine.
ROUTINE AND PERIODIC
MAINTENANCE
Disconnect input AC power supply lines to the machine
before performing periodic maintenance, tightening,
cleaning, or replacing parts. See Figure D.1.
Perform the following daily:
1. Check that no combustible materials are in the
welding area or around the machine.
2. Remove any debris, dust, dirt, or materials that
could block the air flow to the machine for cooling.
3. Inspect the electrode cables for any slits, punctures
in the cable jacket, or any condition that would af-
fect the proper operation of the machine.
Perform Periodically:
Clean the inside of the machine with low pressure air
stream. Clean the following parts. Refer to Figure D.1.
Main transformer and choke.
Electrode and work cable connections.
SCR rectifier bridge and heat sink fins.
Control board.
Fan Assembly.
NOTE: The fan motor has sealed bearings which re-
quire no maintenance.
MAINTENANCE
Drive Rolls and Guide Tubes
After every coil of wire, inspect the wire drive mecha-
nism. Clean it as necessary by blowing with low pres-
sure compressed air. Do not use solvents for cleaning
the idle roll because it may wash the lubricant out of the
bearing. All drive rolls are stamped with the wire sizes
they will feed. If a wire size other than that stamped on
the roll is used, the drive roll must be changed.
Cable Cleaning
Clean cable liner after using approximately 300 pounds
(136 kg) of electrode. Remove the cable from the wire
feeder and lay it out straight on the floor. Remove the
contact tip from the gun. Using an air hose and only
partial pressure, gently blow out the cable liner from the
gas diffuser end.
Excessive pressure at the start may cause dirt to
form a plug.
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Flex the cable over its entire length and again blow out
the cable. Repeat this procedure until no further dirt
comes out.
Gun Tubes and Nozzles
1. Replace worn contact tips as required.
2. Remove spatter from inside of gas nozzle and from
tip after each 10 minutes of arc time or as required.
IDEALARC SP-255
®
CAUTION
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