Tweco 300 XT Ultra-Cut Plasma Cutting System - Manual (Page 59)

ULTRA-CUT 300 XT
Manual 0-5274 INSTALLATION 3-35
4. Insert the stack of consumable parts into the cartridge. Ensure that the large O-ring on the torch tip fits
completely into the cartridge. If any part of the O-ring protrudes from the cartridge, the parts are not seated
properly.
5. Use the cartridge tool to hold the cartridge assembly, while turning the shield cup (and shield retainer for
200 Amp parts) onto the cartridge assembly. For 300 Amp parts turn the shield retainer onto the shield cup
now. When this group is fully assembled, the shield should protrude from the front of the shield cup or
shield retainer. Without this protrusion the shield cup is not properly tightened onto the cartridge assembly.
6. Take the cartridge tool off the cartridge. Fit the cartridge assembly onto the torch head. The Speed Lok
ring should click into place and the cartridge assembly should touch the large O-ring on the torch body.
Torch Head O-Ring
Torch Head
Art # A-08300_AB
0.063 - 0.083"
(1.6 - 2.1 mm)
Protrusion
Installing Assembled Cartridge Onto Torch Head
7. Slide the ohmic clip over the shield cup if using ohmic torch height sensing.
8. Connect the wire lead from the height finder to the ohmic clip if using ohmic torch height sensing.
Ohmic Clip
Art # A-03393_AB
NOTE
Ohmic height sensing is not recommended with water shield. Water on the plate interferes electrically
with the ohmic sensing circuit.