Lincoln Electric 215 manual Maintenance

D-1		MAINTENANCE			D-1
SAFETY PRECAUTIONS			onto the gun tube and does not block the gas
	WARNING		• Be sure the nozzle insulator is fully screwed
			holes in the diffuser.
	ELECTRIC SHOCK can kill.		• Slip the appropriate gas nozzle onto the nozzle
			insulator. Either a standard .50" (12.7 mm) or
	• Have an electrician install and		optional .62" (15.9 mm) I.D. slip-on gas nozzle
	service this equipment.		may be used and should be selected based on
	• Turn the input power off at the		the welding application.
	fuse box before working on		• Adjust the gas nozzle as appropriate for the
	equipment
	• Do not touch electrically hot		GMAW process to be used. Typically, the con-
			tact tip end should be flush to .12" (3.2 mm)
	parts.		extended for the short-circuiting transfer
GENERAL MAINTENANCE			process and .12" (3.2 mm) recessed for spray
			transfer.
sages causing the welder to run hot. Blow dirt out of			GUN TUBES AND NOZZLES
In extremely dusty locations, dirt may clog the air pas-
the welder with low-pressure air at regular intervals to			1. Replace worn contact tips as required.
eliminate excessive dirt and dust build-up on internal
parts.			2. Remove spatter from inside of gas nozzle and from
The fan motors have sealed ball bearings which			tip after each 10 minutes of arc time or as required.
require no service.			GUN CABLE CLEANING
DRIVE ROLLS AND GUIDE PLATES
			To help prevent feeding problems, clean cable liner
After every coil of wire, inspect the wire drive mecha-			after using approximately 300 pounds (136 kg) of
nism. Clean it as necessary by blowing with low pres-			electrode. Remove the cable from the wire feeder and
sure compressed air. Do not use solvents for cleaning			lay it out straight on the floor. Remove the contact tip
the idle roll because it may wash the lubricant out of			from the gun. Using an air hose and only partial pres-
the bearing. All drive rolls are stamped with the wire			sure, gently blow out the cable liner from the gas dif-
sizes they will feed. If a wire size other than that			fuser end.	CAUTION
changed.
stamped on the roll is used, the drive roll must be			Excessive pressure at the beginning of the clean-
For instructions on replacing or changing drive roll,
			ing procedure may cause the dirt to form a plug.
see “Wire Drive Rolls” in Operation section.			-----------------------------------------------------------------------
CONTACT TIP AND GAS NOZZLE			out the cable. Repeat this procedure until no further
INSTALLATION			Flex the cable over its entire length and again blow
			dirt comes out. If this has been done and feed prob-
1. Choose the correct size contact tip for the elec-			lems are experienced, try liner replacement, and refer
			to trouble shooting section on rough wire feeding.
trode being used (wire size is stenciled on the side
of the contact tip) and screw it snugly into the gas
diffuser.

2. Screw the appropriate fixed gas nozzle fully onto the diffuser. Either the standard .50" (12.7 mm) flush nozzle or other optional flush or recessed (spray arc) nozzle sizes may be used. (See Table D.2 in this section.)

3. If using optional adjustable slip-on nozzles, see Table D.2 in this section.

POWER MIG 215