Lincoln Electric SVM 113-A service manual Rheostat Removal and Replacement

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F-39 F-39

TROUBLESHOOTING & REPAIR

RHEOSTAT REMOVAL AND REPLACEMENT (continued)

FIGURE F.15 - RHEOSTAT REMOVAL

See Figure F.15 for steps 3 - 9.

PROCEDURE

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1.Remove the spark plug wire.

2.With the 5/16” nut driver, remove the 8 sheet metal screws that hold the top cover to the control box. Remove the top cover.

3.With the 5/16” nut driver and the 5/16” wrench, remove the 6 screws that hold the control panel in place. Move the panel aside as far as the leads will allow.

4.With the small slot head screw driver, loosen the screw that holds the knob to the rheostat shaft. The shaft has a flat for locating the knob at reassembly.

5.With a 9/16” open or box end wrench, remove the nut that holds the rheostat to the control panel. Support the rheostat with your hand as you turn the nut. There is a shake-proof washer under the nut.

6.Pull the rheostat back out of the control panel and lay it out on its wires to loosen the nuts that hold them.

7.With the 5/16” open or box end wrench, remove the brass nuts from the wire termi- nals. Support the terminals as you turn the wrench to avoid ripping the terminals from their foundations. Note the wire locations for reassembly.

Note: The brass screws are double-nutted with a shake-proof star washer under the screw head.

8.To reinstall the rheostat, replace each of the brass screws. Place a shake-proof star washer under the head, insert the screw into the rheostat and tighten down one nut. Replace the appropriate wires and tighten down the second nut. Again, support the terminals as you turn the wrench to avoid ripping the terminals from their foundations.

9.Reassemble the rheostat to the front of the control panel. Line up the locating tab on the rheostat with the slot on the con- trol panel hole.

10.Reassemble the shake-proof star washer and nut and tighten securely with the 9/16” wrench.

11.Locate the flat spot on the shaft, line up the knob locking screw, push the knob onto the shaft and tighten the screw with the small slot head screw driver.

12.Check the rheostat knob for proper rota- tion, minimum to maximum.

13.Replace the control panel and tighten the 6 sheet metal screws with the 5/16” nut driver and 5/16” wrench.

14.Replace the top cover of the control box and tighten the 8 sheet metal screws with the 5/16” nut driver.

WELDANPOWER 125