Lincoln Electric — To Check the Spark Gap
Maintenance · Hi-Freq. Spark Gap assembly
From a Lincoln Electric operator's manual — check it applies to your exact model before use.
Before you start
- The high voltages developed in the high frequency circuit can be lethal. Turn the input power off using the disconnect switch or fuse box before working inside the machine.
Procedure
- Turn the input power off.
- Remove the access panel on the right case side (Component Access).
- Check the spark gap spacing with a feeler gauge.
- If adjustment is required, loosen the Allen head screw on one of the aluminum blocks, reset the gap, and tighten the screw in the new position.
- If the spark gap is correct, reinstall the access panel on the right case side.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark gap factory setting: 0.015 inches (0.4 mm)
- Reduced setting: 0.008 inches (0.2 mm)
Source: Lincoln Electric operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.