Lincoln Electric SVM176-A GUN and Cable Maintenance, Figuire D.1, Removing Idle Roll Assembly

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D-2	MAINTENANCE					D-2
SAFETY PRECAUTIONS			GUN AND CABLE MAINTENANCE
WARNING			Remove spatter from tip after each ten minutes of arc
Have qualified personnel do the maintenanc		e
work. Turn the engine off before working inside			time or as required.
the machine. In some cases, it may be			Replace worn contact tips and thread protectors as
necessary to remove safety guards to perform
required maintenance. Remove guards only			required.
when necessary and replace them when the			Replace worn spring liners in nozzles. The life of the
maintenance requiring their removal is
complete. Always use the greatest care when			spring can be doubled by rotating it 180°.
working near moving parts.			Clean cables after using approximately 300 pounds of
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ELECTRIC SHOCK can kill.			electrode. Remove the cable from the wire feeder and
• Do not touch electrically live parts or			lay it out straight on the floor. Remove the contact noz-
electrode with skin or wet clothing.			zle tip from the gun. Using an air hose and only partial
• Insulate yourself from work and			pressure, gently blow out the cable from the gun end.
ground			(Too much pressure at the start will cause the dirt to
• Always wear dry insulating gloves.			form a plug.) Flex the cable over its entire length and
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See additional warning	information		again blow out the cable. Repeat this procedure until
throughout this operatorʼs manual and			no further dirt comes out.
the Engine manual as well.			Before any gun is disassembled, remove unit from the
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REPLACING OR REVERSING DRIVE ROLLS (See				FIGUIRE D.1
Figure D.1)			2		3
Loosen idle roll tension screw (Item 1) to release pres-
sure between idle roll and drive rolls.
Remove hex head screw (Item 2) with a 1/2" wrench
and remove the drive roll clamping collar (Item 3).
Remove drive rolls from shaft.
Wipe the drive roll surfaces clean. Then install new
			6		1 4 5
drive rolls. If reversing drive rolls, turn drive rolls over so
unworn teeth face each other.				IDLE ROLL TENSION
Replace clamping collar and hex head screw.				ADJUSTING SCREW
			WIRE DRIVE ASSEMBLY MAINTENANCE
Tighten the idle roll tension screw until it bottoms and
then back it out two complete turns. If feeding problems			Every 500 pounds of electrode, the drive roll section
persist, do not increase the tension. check for other
issues such as the wire spool binding or a dirty or dam-			should be inspected and cleaned out if necessary. Do
aged gun cable			not use a solvent for cleaning the idle roll as it may
REMOVING IDLE ROLL ASSEMBLY			wash lubricant out of the bearing.
			Replace drive rolls as required. Drive rolls should be
Remove the idle roll tension screw (Item 1), tension			worn on both sides before replacing. See “A” of this
spring retainer (Item 4), and tension spring (Item 5).			section.
Pivot the idle roll assembly away from the gearbox and			Check the motor brushes every six months. Replace if
lift it off the pivot pin (Item 6).			they are less than 1/4" long.
To re-assemble, replace idle roll assembly, tension			Every year examine the gear box and paint the gear
spring, retainer, and tension screw. Adjust the tension			teeth with moly-disulfide filled grease.
screw as described above.		LN-23P