Checking/Replacing Retaining Cup, Tip, And Electrode - Miller Electric Spectrum 1251 Owner's Manual

7-4. Checking/Replacing Retaining Cup, Tip, And Electrode

Inspect shield cup, tip, and electrode for wear before cutting or whenever cutting speed has been significantly
reduced. Do not operate torch without a tip or electrode in place. Be sure to use genuine replacement parts.
A good practice is to replace both the tip and electrode at the same time.
Turn Off power source before checking torch parts.
3
New
4
Make sure this area is
clean of any debris.
1
Turn Off power source.
1 Drag Shield
Check this area for any debris or foreign
material. Clean out if necessary.
2 Retaining Cup
Remove retaining cup. Check retaining cup
for cracks, and replace if necessary.
3 Tip
4 Opening
OM-201 872 Page 40
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A complete Parts List is available at www.MillerWelds.com
Overtightening will strip threads. Do not overtighten electrode, tip,
and retaining cup during assembly. Do not cross-thread parts causing
stripping. Use care during torch assembly and parts replacement.
1/32 in (1 mm) to 1/16 in
(2 mm) maximum pit
depth depending on
acceptable cut quality
5
New
Worn
2
Remove tip. Check tip, and replace if open-
ing is deformed or 50% oversize. If inside of
tip is not clean and bright, clean with steel
wool. Be sure to remove any pieces of steel
wool afterwards.
5 Electrode
Check electrode. If center has a pit more
than a 1/32 in (1 mm) deep, remove and
replace electrode.
6 Swirl Ring
Worn
Make sure this area is
clean of any debris.
8
7
6
Remove swirl ring. Check ring, and replace
if side holes are plugged.
7 O-Ring
Check O-rings on torch. If needed, coat with
thin film of silicone lubricant (part no.
169 231). Replace if damaged.
8 Plunger Area
Check this area for any debris or foreign
material. Clean out if necessary.
Carefully reassemble parts in reverse order.
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