Tweco A80-A120 CutMaster - Manual (Page 82)

CUTMASTER A80, A120
SERVICE Manual 0-5119
5T-2
5T.02 Inspection and Replacement of
Consumable Torch Parts
WARNING
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.
Remove the consumable torch parts as follows:
NOTE
The shield cup holds the tip and starter cartridge
in place. Position the torch with the shield cup
facing upward to prevent these parts from falling
out when the cup is removed.
1. Unscrew and remove the shield cup from the
torch.
NOTE
Slag built up on the shield cup that cannot be re-
moved may effect the performance of the system.
2. Inspect the cup for damage. Wipe it clean or
replace if damaged.
Art # A-08067
Shield Cups
3. On torches with a shield cup body and a shield
cap or deflector, ensure that the cap or deflector
is threaded snugly against the shield cup body.
In shielded drag cutting operations (only),
there may be an O-ring between the shield cup
body and drag shield cap. Do not lubricate the
O-ring.
Shield Cap,
Deflector
Shield Cap,
Machine
Shield
Cup Body
Shield
Cup
Art # A-08742
Drag
Shield Cap
4. Remove the tip. Check for excessive wear (in-
dicated by an elongated or oversized orifice).
Clean or replace the tip if necessary.
Good Tip Worn Tip
A-03406
Example of Tip Wear
5. Remove the starter cartridge. Check for exces-
sive wear, plugged gas holes, or discoloration.
Check the lower end fitting for free motion.
Replace if necessary.
Art # A-08064_AC
Spring-Loaded
Lower End Fitting
Full Compression
Spring-Loaded
Lower End Fitting at Reset /
Full Extension
6. Pull the Electrode straight out of the Torch
Head. Check the face of the electrode for exces-
sive wear. Refer to the following figure.
Worn Electrode
New Electrode
Art # A-03284
Electrode Wear
7. Reinstall the Electrode by pushing it straight
into the torch head until it clicks.
8. Reinstall the desired starter cartridge and tip
into the torch head.
9. 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.
This completes the parts replacement procedures.