Hobart Welding Products 250 Optional Spool Gun Switch, Description Remarks

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Item		Dia.	Part	Description	Quantity
	No.	Mkgs.	No.	Description	Quantity
				Figure 8-5. M-25 Gun (Continued)

. . .	8 . . .	. . . . . .	. 169 738	. . NUT, locking handle	. . . 1
. . .	9 . . .	. . . . . .	. 169 732	. . NUT, jam	. . . 1
. . . 10 . . .		. . . . . .	. 227 799	. . HANDLE, rear	. . . 1
. . . 11 . . .		. . . . . .	. 227 800	. . CORD, trigger assembly	. . . 1
. . . 12 . . .		. . . . . .	. 209 495	. . CONNECTOR, feeder	. . . 1
. . . 13 . . .		. . . . . .	. 079 974	. . O-RING, .500 ID x .103CS rbr	. . . 2
. . . 14 . . .		. . . . . .	+194 010	. . LINER, monocoil .023/.025 wire x 15ft (consisting of)	. . . 1
. . . 14 . . .		. . . . . .	+194 011	. . LINER, monocoil .030/.035 wire x 15ft (consisting of)	. . . 1
. . . 14 . . .		. . . . . .	+194 012	. . LINER, monocoil .035/.045 wire x 15ft (consisting of)	. . . 1
. . . 14 . . .		. . . . . .	+194 014	. . LINER, monocoil 3/64 AL wire x 10ft (consisting of)	. . . 1
. . . 15 . . .		. . . . . .	. 079 975	. . . . O-RING, .187 ID x .103CS rbr	. . . 1
. . . 16 . . .		. . . . . .	. 227 798	. . SWITCH, trigger	. . . 1

♦OPTIONAL

To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested Replacement Parts. Model and serial number required when ordering parts from your local distributor.

Item	Dia.	Part	Description	Quantity
No.	Mkgs.	No.	Description	Quantity
			Optional Spool Gun Switch

. . . . . . . . .	. . . . . . . . . .	186 420 . .	SWITCH ASSY	. . . 1
. . . . . . . . .	. . . . . . . . . .	202 449 . .	PLATE, switch	. . . 1
. . . . . . . . .	. . . . . . . . . .	202 910 . .	LABEL, spoolgun/mig gun	. . . 1

To maintain the factory original performance of your equipment, use only Manufacturer’s Suggested Replacement Parts. Model and serial number required when ordering parts from your local distributor.

Table 8-1. Accessories

PART NO.	DESCRIPTION	REMARKS

042 758	Dual Bottle Rack Kit	Converts Single Cylinder Rack To Dual Rack

225 273	8 in Spool Spacer	Aligns Narrow Spools With Feed Head

212 492	Regulator/Flowmeter	For Use With 100% CO2 Shielding Gas
300 144	Spool Gun 3545-20	Provides Excellent Feeding Of Aluminum Wire

OM-192 440 Page 49

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Contents Processes OM-192 440WDescription File MIG GmawFrom Hobart to You Table of Contents Warranty Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Principales normes de sécuritéWelding Power Source Duty Cycle And Overheating SpecificationsExceeding duty cycle can damage unit and void warranty OverheatingDefinition Welding Gun Duty Cycle And OverheatingVolt-Ampere Curves Installing Welding Gun Installing Work Clamp Connecting To Weld Output TerminalsInstalling Wire Spool And Adjusting Hub Tension Setting Gun Polarity For Wire TypeRear Panel Installing Gas SupplyVolts Positioning Jumper LinksHz Single Electrical Service GuideInput Voltage Min Grounding Conductor Size In AWGSelecting a Location And Connecting Input Power Wood Threading Welding WireOperation Turn Off unit, and disconnect input powerTurn Off unit Connecting Spool Gun To Welding Power SourceControls − OperationWhile welding Voltage switch positionWeld Parameters Number on left of slash To read settingsExample 2/40 = Disconnect power before maintaining Routine MaintenanceSupplementary Protectors MonthsRemoving Knob From Front Panel Replacing Drive Roll And Wire Inlet GuideTurn Off power Replacing Gun Contact Tip Turn Off power before replacing contact tipWire size stamped on tip − check and match wire size Turn off welding power source/wire feederReplacing Switch And/Or Head Tube Wire Drive/Gun Troubleshooting Table Welding Troubleshooting TableWire Drive/Gun Trouble Remedy Welding Trouble RemedyTypical MIG Process Connections − MIG Welding Gmaw GuidelinesWire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a AmperageHolding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Gun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Waviness Of BeadWire does not feed Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases ApplicationWelding arc not stable Wire slipping in drive rolls OM-192 440 − Electrical Diagram − Parts List REGULATOR/FLOWMETER, 10−50 CFH ARGON/CO2 Center Baffle w/Components Center Baffle w/Components -1Item Rear Panel w/Components Front Panel w/Components M-25 Gun Description Remarks Optional Spool Gun SwitchPage Assistance ServiceSupport Hobart Welding Products Contact your Distributor for