Snap-On MM140SL Owner's Manual
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Snap-On MM140SL Owner's Manual

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OWNER'S MANUAL
MM140SL M.I.G. COMBINATION UNIT
CONGRATULATIONS!
YOU HAVE PURCHASED THE WORLDS FINEST 115
VOLT AC SINGLE PHASE MIG WELDING SYSTEM
AVAILABLE EXCLUSIVELY FROM SNAP-ON TOOLS.
THE SNAP-ON MUSCLE MIG SYSTEM MODEL#
MM140SL IS DESIGNED AND ENGINEERED BY THE
PROS FOR THE PROS. UNDER NORMAL CARE THIS
SYSTEM WILL PROVIDE YOU WITH YEARS OF UN-
SURPASSED SERVICE AND MOST IMPORTANTLY
PERFORMANCE.
FOR TECH. SERVICE, CALL TOLL-FREE 1-800-232-9353
INSTALLATION
OPERATION
MAINTENANCE
FORM WC5376
Rev. 11/98, 1/00, 8/00, 4/01

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Summary of Contents for Snap-On MM140SL

  • Page 1 VOLT AC SINGLE PHASE MIG WELDING SYSTEM AVAILABLE EXCLUSIVELY FROM SNAP-ON TOOLS. THE SNAP-ON MUSCLE MIG SYSTEM MODEL# MM140SL IS DESIGNED AND ENGINEERED BY THE PROS FOR THE PROS. UNDER NORMAL CARE THIS SYSTEM WILL PROVIDE YOU WITH YEARS OF UN- SURPASSED SERVICE AND MOST IMPORTANTLY PERFORMANCE.

  • Page 2: Table Of Contents

    TROUBLE SHOOTING CHART..........15 CONNECTING FLEX-TIG OR SPOOL GUN ......20 LINER INSTALLATION ............... 21 PARTS BREAKDOWN - MIG TORCH ........22 OPTIONS - FLEX-TIG OR SPOOL GUN ........24 PARAMETER CHARTS .............. 25 Snap-on Tools Corporation Kenosha WI 53141-1410...

  • Page 3: Electrical Supply Requirements

    12 Gauge 30 Amp 10 Gauge Do not rely on the circuit breaker built into the MM140SL to protect your wiring. This circuit breaker protects the MM140SL internal wiring only. Do not use undersized extension cords. Follow the cord manufacturer's recommendations as to current carrying capacities.

  • Page 4: Introduction

    INTRODUCTION WIRE SPOOL The Snap-on Tools MM140SL is a FEED ROLLS combination welding power source, remote feed unit, MIG torch and accessory package. It operates on POWER SOURCE 115 volts AC input current and is TORCH designed to meet the requirements of autobody repair shops.

  • Page 5: Description, Specifications

    DESCRIPTION SPECIFICATIONS (Cont.) REMOTE FEED UNIT The MM140SL consists of a combi- Input Voltage 28 VAC nation MIG welding power source and remote feed unit, a MIG torch with Wire Feed Speed Range: 50-800 IPM 10 foot cable, a fifteen foot feeder...

  • Page 6: Check List (Contents)

    CHECK LIST ELECTRICAL SUPPLY THE SNAP-ON TOOLS MM140SL INCLUDES Follow the Electrical Supply Re- THE FOLLOWING: quirements on page 1. INSTALLING THE FEEDER CONTROL CABLE 1- Combination Power Source/Remote ASSEMBLY Feed Unit 1- Cylinder Rack/Industrial Wheel 1. Uncoil the cable assembly.
  • Page 7 RECEPTACLE rate is 30 CFH. When welding (OUTPUT) aluminum, the gas flow rate is 40 CFH. WELDING MACHINE NOTE The MM140SL must be turned TO (+) "ON" torch TERMINAL trigger depressed, before (STANDARD) the gas flow rate can be adjusted.
  • Page 8 .040" - .045" STEEL WIRES 1. Remove the wire spool clip from AND 3/64" ALUMINUM WIRES the spool hub. 2. Unpack the spool of welding wire FIG. 8. DOUBLE GROOVE DRIVE ROLL from its protective packaging. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 9 HOT when the contact tip. For aluminum or the torch trigger is actu- stainless steel welding, anti-spatter compound can be ated. used as it will contaminate the weld. Snap-on Tools Corporation Kenosha, WI 53141-1410...

  • Page 10: Operation

    Uncoil the work (ground) cable is common to the work cable and plug it into the negative (-) on the welder. terminal on the machine. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 11 PROCESS SELECTION F. "ON" INDICATOR LIGHT Illuminates when the circuit The following controls are lo- breaker on the machine is "ON". cated on the front of the MM140SL. G. (-)NEGATIVE TERMINAL Negative output terminal. GAS- OCV/GAS CURRENT PURGE work cable is plugged into this...
  • Page 12 The contact tip should be flush or stick out up to 1/16 inch beyond the end of the nozzle. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 13 FOR WELDING ALUMINUM inside the nozzle approximately 3/8 inch. This helps prevent the 4. Follow steps 4 and 5 as in welding wire from burning back to the contact tip. "Continuous Welding on Steel". Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 14 WORK SHIELDING GAS 6. To ascertain a good spot weld, look at the back side of the welded material. A small melt- through of approximately 1/16 FIG. 17. STITCH WELDING inch diameter is ideal. Snap-on Tools Corporation Kenosha, WI 53141-1410...

  • Page 15: Maintenance

    Use low pressure The frequent use of anti-spatter dry compressed air. spray will help prevent the adher- ence of spatter to the torch compo- nents. (continued on following page) Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 16 DO NOT weld in a closed in RECOMMENDED area. Proper ventilation is a CUSTOMER SPARE PARTS necessity, fresh supplied hood should be worn. The Snap-on Tools MM140SL is a machine of proven design and relia- WHEN welding near com- bility.

  • Page 17: Trouble Shooting Chart

    Sand points or replace (CR1) relay. Loose or broken connection. Tighten or repair connection. (continued on following page) - USE THIS IDENTIFIER, ALONG WITH THE SCHEMATIC DIAGRAM FOUND IN THE SERVICE (SYMBOL*) MANUAL, FOR TROUBLE-SHOOTING PURPOSES. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 18 Replace spring. Worn or dirty contact tip. Replace contact tip. Worn inlet guide(s). Clean or replace guides. Sticking pressure roll. Replace pressure roll. Feed roll tension incorrect. Adjust feed roll tension. See page 8. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 19 Replace solenoid. (GS) Incorrect electrode wire. Use correct wire. Contaminated base material. Clean or etch base material. - USE THIS IDENTIFIER, ALONG WITH THE SCHEMATIC DIAGRAM FOUND IN THE SERVICE (SYMBOL*) MANUAL, FOR TROUBLE-SHOOTING PURPOSES. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 20 (Radio Shack #276-1372) be used where the diode makes contact with the aluminum heat sink. Do not grease the threads on the diode. Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 21 (on the front of the machine) should affect the speed 5. Remove any tension on the drive of the drive roll from "0" thru roll. "10". 6. Activate the torch trigger. 10.Adjustment is now complete! Snap-on Tools Corporation Kenosha, WI 53141-1410...

  • Page 22: Connecting Flex-Tig Or Spool Gun

    F L E X T I G m a n u a l 6. To change back to standard MIG (Form WC5229). operation, reverse the proce- 7. To change back to standard MIG dure. operation, reverse the proce- dure. Snap-on Tools Corporation Kenosha, WI 53141-1410...

  • Page 23: Liner Installation

    (steel only) LINER The MIG torch liner provided with STICKOUT the MM140SL is designed for wire diameters from .020 thru .030. If FIG. 20. - LINER STICKOUT larger wire diameters are to be fed and or there is a problem (i.e.

  • Page 24: Parts Breakdown - Mig Torch

    ONLY ONLY ONLY .020-.030 inch 10 feet M103L-B M3LS-B (Blue) .035 inch 10 feet M103AL M3-6ALS M3-THS 10 feet M104L-N .035-.045 inch M4LS-N (Natural) 3/64 inch 10 feet M104AL M3-6ALS M3-THS 12 feet M124L-N Snap-on Tools Corporation Kenosha, WI 53141-1410...
  • Page 25 ITEMS WITH THE ASTERICK M3-308 M3-306 M3-120* ARE AVAILABLE FACTORY (2 REQD.) INSTALLED ONLY. TORCH REBUILD PROGRAM 15 SERIES TORCHES CAN BE REBUILT BY THE M3-310A FACTORY FOR A NOMINAL LABOR + PARTS CHARGE. Snap-on Tools Corporation Kenosha, WI 53141-1410...

  • Page 26: Options - Flex-Tig Or Spool Gun

    SNAP-ON TOOLS MUSCLE MIG SYSTEM (MM140SL, MM250SL) The TIG Welding Process is used to produce the highest quality, porosity-free welds. The FLEXTIG adds TIG Welding capabilities to your Snap-on Tools MIG Welder. The FLEXTIG is designed for Tungsten-Inert Gas (TIG) welding with Direct Current, Straight Polarity (DCSP) on steel, stainless steel, chrome-moly, copper or cast iron (18 Ga.

  • Page 27: Parameter Charts

    16 GA.(.060") " 1 1/2 Then secure drive roll with the washer and the Note: Settings are approximate and may vary. Adjust nut provided. for best results. Snap-on Tools Corporation Kenosha, WI 53141-1410 LB-1366...
  • Page 28 Snap-on Tools Corporation Kenosha, WI 53141-1410...

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