Lincoln Electric SP-250 service manual Routine and Periodic, Maintenance

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D-1		MAINTENANCE			D-1
SAFETY PRECAUTIONS			Drive Rolls and Guide Tubes
	WARNING		After every coil of wire, inspect the wire drive mecha-
			nism. Clean it as necessary by blowing with low pres-
•Have a qualified technician do the maintenance			sure compressed air. Do not use solvents for cleaning
and troubleshooting work.			the idle roll because it may wash the lubricant out of
			the bearing. All drive rolls are stamped with the wire
•Disconnect input power at main input supply prior			sizes they will feed. If a wire size other than that
to working inside machine.			stamped on the roll is used, the drive roll must be
____________________________________			changed .
Read the Safety Precautions in the front of this manu-			Drop-In Reel Spindle and Clips
al before working on this machine.
ROUTINE AND PERIODIC			Before loading a coil of wire into the SP-250 drop-in
			spindle, inspect the mating surfaces of the spindle
MAINTENANCE
			hubs and the spindle mounting clips (V-brackets) and,
			if necessary, wipe or blow out any dirt and debris which
Disconnect input AC power supply lines to the machine			may have deposited on these surfaces .
before performing periodic maintenance, tightening,			Cable Cleaning
cleaning, or replacing parts. See Figure D.1.
			Clean cable liner after using approximately 300
Perform the following daily:			pounds (136 kg) of electrode. Remove the cable from
			the wire feeder and lay it out straight on the floor.
1. Check that no combustible materials are in the			Remove the contact tip from the gun. Using an air hose
			and only partial pressure, gently blow out the cable
	welding or cutting area or around the machine.		liner from the gas diffuser end.
2. Remove any debris, dust, dirt, or materials that
				CAUTION
	could block the air flow to the machine for cooling.
3. Inspect the electrode cables for any slits, punc-			Excessive pressure at the start may cause dirt to form
	tures in the cable jacket, or any condition that		a plug.
	would affect the proper operation of the machine.		____________________________________
Perform Periodically:			Flex the cable over its entire length and again blow out
			the cable. Repeat this procedure until no further dirt

comes out.

Clean the inside of the machine with low pressure air stream. Clean the following parts. Refer to Figure D-1.

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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 require no maintenance.

Gun Tubes and Nozzles

a.Replace worn contact tips as required.

b.Remove spatter from inside of gas nozzle and from tip after each 10 minutes of arc time or as required.

IDEALARC SP-250