Snap-On MM 140 SL Owners Manual

M.I.G. TORCH LINER INSTALLATION

(steel only)

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

clog, kink, etc.), a liner change is required.

Following is a step by step guide to aid in liner removal and installation.

NOTE

When removing the welding wire from the MIG torch, care should be taken to avoid the wire from uncoiling from the wire spool.

REMOVING OLD LINER

1.

Remove torch assembly from the welding machine.

2.

Place torch assembly on a flat surface, making sure torch is laying straight as possible.

3.

Remove nozzle, bushing insulator, contact tip and gas diffuser from the front end of the torch assembly.

4.

Loosen set screw located on the connector end of the torch assembly (see FIG. 21).

5.

Grip the liner and gas seal firmly, then pull. The liner should easily slide from torch assembly.

INSTALLING NEW LINER

1.

Remove the new liner from the package.

2.

Uncoil liner and lay the liner parallel next to the MIG torch assembly.

3.

Adjust the liner stickout length to 3/4" as shown in FIG. 20.

GAS SEAL 3/4"

LINER

STICKOUT

FIG. 20. - LINER STICKOUT

4.

Install the new liner into the

MIG torch assembly, until gas seal seats flush with the connector plug.

5.

Tighten set screw. (Do not overtighten), refer to FIG. 21.

SET SCREW

3/4"

CONNECTOR

PLUG

FIG. 21. - TORCH CONNECTOR END

6.

Following the diagram in FIG.

22, measure out 1 1/4"+ from the neck assembly and cut off the protruding liner.

7.

Debur the cutoff end of the liner to insure unobstructed wire feed.

1 1/4+"

NECK

ASSEMBLY

PROTRUDING

LINER

FIG. 22. - TORCH FRONT END

8.

Install the gas diffuser and contact tip of proper wire size, tighten with a wrench.

9.

Install the bushing insulator onto the gas diffuser. Spray the

"O" rings with anti-spatter compound for lubrication.

10.

Install the TWIST-ON adjustable nozzle and twist the nozzle during the installation. Turn to

Page 7 for correct nozzle adjustment.

Snap-on Tools Corporation Kenosha, WI 53141-1410 21