Lincoln Electric Magnum PRO 250 LX Operator'S Manual Download Page 2

THANK YOU FOR SELECTING 

A QUALITY PRODUCT BY 

LINCOLN  ELEC  TRIC. 

PLEASE EXAMINE CARTON AND EQUIPMENT FOR
DAMAGE IMMEDIATELY

When this equipment is shipped, title passes to the purchaser
upon receipt by the carrier. Consequently, claims for material
damaged in shipment must be made by the purchaser against the
transportation company at the time the shipment is received.

SAFETY DEPENDS ON YOU

Lincoln arc welding and cutting equipment is designed and built
with safety in mind. However, your overall safety can be increased
by proper installation ... and thoughtful operation on your part. 

DO NOT INSTALL, OPERATE OR REPAIR THIS EQUIPMENT 

WITHOUT READING THIS MANUAL AND THE SAFETY

PRECAUTIONS CONTAINED THROUGHOUT.

And, most importantly,

think before you act and be careful.

This statement appears where the information must be followed
exactly to avoid serious personal injury or loss of life.

This statement appears where the information must be followed
to avoid minor personal injury or damage to this equipment.

KEEP YOUR HEAD OUT OF THE FUMES.

DON’T

get too close to the arc.

Use corrective lenses if necessary
to stay a reasonable distance
away from the arc.

READ

and obey the Safety Data

Sheet (SDS) and the warning label
that appears on all containers of
welding materials.

USE ENOUGH VENTILATION

or

exhaust at the arc, or both, to
keep the fumes and gases from 
your breathing zone and the general area.

IN A LARGE ROOM OR OUTDOORS

, natural ventilation may be

adequate if you keep your head out of the fumes (See below).

USE NATURAL DRAFTS

or fans to keep the fumes away 

from your face.

If you de velop unusual symptoms, see your supervisor. 
Perhaps the welding atmosphere and ventilation system 
should be checked.

WEAR CORRECT EYE, EAR & 
BODY PROTECTION

PROTECT

your eyes and face with welding helmet

properly fitted and with proper grade of filter plate
(See ANSI Z49.1).

PROTECT

your body from welding spatter and arc

flash with protective clothing including woolen
clothing, flame-proof apron and gloves, leather
leggings, and high boots.

PROTECT

others from splatter, flash, and glare

with protective screens or barriers.

IN SOME AREAS

, protection from noise may be appropriate.

BE SURE

protective equipment is in good condition.

Also, wear safety glasses in work area

AT ALL TIMES.

SPECIAL SITUATIONS

DO NOT WELD OR CUT

containers or materials which previously

had been in contact with hazardous substances unless they are
properly cleaned. This is extremely dangerous.

DO NOT WELD OR CUT

painted or plated parts unless special

precautions with ventilation have been taken. They can release
highly toxic fumes or gases.

Additional precautionary measures

PROTECT

compressed gas cylinders from excessive heat,

mechanical shocks, and arcs; fasten cylinders so they cannot fall.

BE SURE

cylinders are never grounded or part of an 

electrical circuit.

REMOVE 

all potential fire hazards from welding area.

ALWAYS HAVE FIRE FIGHTING EQUIPMENT READY FOR

IMMEDIATE USE AND KNOW HOW TO USE IT.

WARNING

CAUTION

Safety 01 of 04 - 5/16/2018

Summary of Contents for Magnum PRO 250 LX

Page 1: ...gister Authorized Service and Distributor Locator www lincolnelectric com locator IM10484 Issue Date Nov 16 18 Lincoln Global Inc All Rights Reserved K Number K3569 2 Magnum PRO 250 LX GT K3570 2 Magn...

Page 2: ...A LARGE ROOM OR OUTDOORS natural ventilation may be adequate if you keep your head out of the fumes See below USE NATURAL DRAFTS or fans to keep the fumes away from your face If you develop unusual s...

Page 3: ...hot engine parts and igniting Do not spill fuel when filling tank If fuel is spilled wipe it up and do not start engine until fumes have been eliminated 1 d Keep all equipment safety guards covers and...

Page 4: ...m to ANSI Z87 I standards 4 b Use suitable clothing made from durable flame resistant material to protect your skin and that of your helpers from the arc rays 4 c Protect other nearby personnel with s...

Page 5: ...nt passing through lifting chains crane cables or other alternate circuits This can create fire hazards or overheat lifting chains or cables until they fail 6 h Also see item 1 c 6 I Read and follow N...

Page 6: ...CTION 6 MAKING A WELD 7 MACHINE OPERATION SECTION 7 PROCEDURE SETTINGS 8 SETTING GAS FLOW RATE 9 OPTIONAL KITS AND ACCESSORIES 10 MAINTENANCE 10 ROUTINE MAINTENANCE 10 TROUBLESHOOTING 11 HOW TO USE TR...

Page 7: ...aded to withstand the harsh conditions of being used in rugged environments NOTE Please turn off gas when not in use SPECIFICATIONS SUPPLIED wITH KP2745 364AT 3 64 Contact Tip KP2747 1A Aluminum Diffu...

Page 8: ...l of the parts listed KP2745 364AT Contact Tip 3 64 1 2mm Included KP2747 1A Aluminum Gas Diffuser Installed KP2743 1 62RA Aluminum Gas Nozzle Installed 1 8 Recess 625 ID KP2518 2 U Groove Drive Roll...

Page 9: ...l be in the 3 64 operating position Reverse roller for 030 or 035 inch 0 9 mm diameter wire 5 Gas nozzle directs gas flow around arc Pull off gas nozzle to see contact tip and gas diffuser Spool gun i...

Page 10: ...e available and the best choice depends on the type of base metals and the desired characteristics of the weldment such as ductility and strength corrosion resistance sustained service temperature and...

Page 11: ...between drive roll pressure idler roll 8 Push wire until wire end extends approximately 6 150 mm past end of gas diffuser Re engage idle roll pressure by pushing release lever down as shown above the...

Page 12: ...rive Roll Orientation B Changing Drive Roll Orientation Note The drive roll and motor shaft are left hand thread 1 Flip lid open then move release lever to the up position 2 Take wrench 10mm and loose...

Page 13: ...just gas flow per Setting Gas Flow Rate 7 Re engage wire drive by pushing release lever to down position to feed wire 8 Momentarily squeeze trigger and verify that wire feeds properly Trim wire to app...

Page 14: ...8 9 Wire Size Metal Thickness Arc Volts Wire Speed Amps DC in mm ga in mm ipm mpm 030 0 8 22 030 0 8 13 14 1 200 5 1 40 20 036 1 0 13 14 1 240 6 1 40 18 048 1 2 14 15 1 290 7 4 50 16 060 1 6 15 16 1 3...

Page 15: ...25 Thread on 550A Nozzle Tip Recessed Order KP2743 1 62RA Insulator For 550 Amp front end expendables Order KP2773 1 Contact Tips Both standard duty and heavy duty contact tips are available in a vari...

Page 16: ...1 LOCATE PROBLEM SYMPTOM Look under the column labeled PROBLEM SYMPTOMS This column describes possible symptoms that the machine may exhibit Find the listing that best describes the symptom that the...

Page 17: ...ler 1 Change position of wire drive roller 2 Wire drive release open 2 Close wire drive release 3 Wire welded to tip 3 Peel wire off tip or use new tip 4 Wire spool empty 4 Insert new spool 5 Tip too...

Page 18: ...should vary from 5K 0 ohms TESTINg THE TRIggER SwITCH Using the torch Control Cable Connector check for continuity across pins E and F when the trigger is pressed 12 Observe all Safety Guidelines det...

Page 19: ...ed 12 Test weld before adding blue loctite into the set screw hole at the trigger top red part FIGURE F 1 MECHANICAL vALvE REPLACEMENT 1 Remove the following items a Gun tube barrel b Plastic screw co...

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Page 22: ...parts or electrode with skin or wet clothing l Insulate yourself from work and ground l No toque las partes o los electrodos bajo carga con la piel o ropa moja da l Aislese del trabajo y de la tierra...

Page 23: ...d Entl ftung des Arbeitsplatzes l Mantenha seu rosto da fuma a l Use ventila o e exhaust o para remover fumo da zona respirat ria l Turn power off before servicing l Desconectar el cable de ali mentac...

Page 24: ...tomer s particular purpose with respect to such information or advice As a matter of practical consideration we also cannot assume any responsibility for updating or correcting any such information or...

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