Tweco 7-5227 - Manual (Page 6)

July 28, 2004 6 Manual 0-4647
Inspection and Replacement of
Consumable Torch Parts
A. General Information
WARNINGS
Disconnect primary power to the system before
disassembling the torch or torch leads.
DO NOT touch any internal torch parts while the
AC indicator light of the Power Supply is ON.
Unthread the shield cup assembly to remove the consum-
able torch parts.
1. Inspect the cup for damage. Wipe it clean or replace if
damaged. Slag built up on the shield cup that cannot
be removed may affect the performance of the system.
A-03645
Electrode
Starter Cartridge
Tip
Shield Cup
Torch Head
2. Check the tip for excessive wear (indicated by an elon-
gated or oversized orifice). Clean or replace the tip if
necessary.
Good Tip Worn Tip
A-03406
3. Check the starter cartridge for excessive wear, plugged gas
holes, discoloration, and for free movement of the lower
end plate. Replace if necessary.
Lower End Fitting
Start Cartridge
Art # A-03621
4. Check the end of the electrode for excessive wear.
Worn Electrode
New Electrode
Art # A-03284
5 . Reinstall the Electrode by pushing it straight into the torch
head until it clicks.
WARNINGS
Refer to the consumables selection charts for the
proper combination of torch parts.
The use of any consumable parts other than those
specified by the Manufacturer may cause irrepa-
rable damage to the torch head.
6 . Reinstall the desired starter cartridge and tip into the torch
head.
7. Hand tighten the shield cup until it is seated on the torch
head. If resistance is felt when installing the cup, check the
threads before proceeding.
NOTE
When operating the torch in a normal condition,
a small amount of gas vents through the gap be-
tween the shield cup and the torch handle. Do not
attempt to overtighten the shield cup as irrepa-
rable damage to internal components may result.