Miller Electric XR Control manual Changing Gun Contact Tip

7-5. Changing Gun Contact Tip

Remove nozzle 1 Nozzle

2 FasTip Unscrew FasTip. Install new FasTip.

2

1

Ref. 150 437-A

7-6. Replacing Or Cleaning Gun Drive Roll In Pistol-Grip Guns

5

3

4

2

6 7

Turn Off wire feeder and welding power source.

1Top Cover

2Pressure Roll Assembly

Cut off wire where it enters pressure roll assembly area.

3Setscrew

4Current Pick-Up Tab

1This tab helps prevent burnback caused by welding arcs inside the

contact tip. This tab may be re- moved to provide an insulated drive roll. (If tab is removed, a smaller di- ameter contact tip is recom- mended. See options in Parts List.) Lightly grease top of tab before rein- stalling.

5 Drive Roll

Use wire brush to clean drive roll. Install drive roll with desired groove down, and turn drive roll so one setscrew faces flat side of shaft.

6Bearing

7Liner

Line up drive roll groove with bear- ing groove and liner opening. Tighten setscrews.

If changing drive roll in feeder, see Section 7-1.

Thread welding wire through gun, and adjust drive roll pressure, if necessary (see Section 5-13). Close and secure pressure roll assembly. Reinstall top cover.

Tools Needed: 5/64 in

Ref. 151 599-F

OM-1594 Page 35