Miller Electric HF-251D-1, HF-251-2 manual Adjusting Spark Gaps

5-2. Adjusting Spark Gaps
			Turn Off unit and welding power
			source and disconnect input power.
		Rear Of Unit	Loosen screw on spark gap access
			door and open.
			1 Tungsten End Of Point
			Do not clean or dress tungsten.
			Replace point if tungsten end
			disappears.
			2	Spark Gap
			Normal spark gap is 0.008 in (0.203
			mm).
			If spark gaps are okay, reinstall
			door. If adjustment is needed, con-
			tinue as follows:
			3	Adjustment Screws
			Loosen screws. Place gauge of
			proper thickness in spark gap.
			4	Pressure Point
			Apply slight pressure at point until
			gauge is held firmly in gap. Tighten
			adjustment screws to 12 in/lbs
			torque (overtightening will deform
			plastic base). Repeat gauge adjust-
			ment with other gap.
1	2		Close access door.
3	4
Tools Needed:
5/32 in	0.008 in
	(0.203 mm)
				Ref. 098 956-G

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