Tweco M-42 RPT - Manual (Page 4)

January 23, 2004 4 Manual 0-2856
Change the torch parts for a different operation as fol-
lows:
NOTE
The shield cup holds the tip and gas distributor in
place. Position the torch with the shield cup fac-
ing upward to prevent these parts from falling out
when the cup is removed.
1. Unscrew and remove the shield cup from the torch
head.
Torch Head Assembly
(70˚ Hand Torch Shown)
Shield Cup
Gas
Distributor
Tip
Electrode
A-03025
2. Tilt the torch head to remove the tip and gas distribu-
tor.
3. Remove the SureLok Electrode by pulling it straight
out of the Torch Head.
4. Install the SureLok Electrode by pushing it straight
into the torch head until it clicks.
WARNINGS
The SureLok Electrode can only be used with the
SureLok Torch Head.
The use of any consumable parts other than
those specified by the Manufacturer may cause
irreparable damage to the torch head.
5 . Install the desired gas distributor and tip for the op-
eration into the torch head.
6. 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.
General Torch Maintenance
A. Cleaning Torch
Even with only clean air, eventually the inside of the
torch becomes coated with residue. This buildup can
affect the pilot arc initiation and the overall cut qual-
ity of the torch.
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.
The inside of the torch should be cleaned with elec-
trical contact cleaner using a cotton swab or soft wet
rag. In severe cases, the torch can be removed from
the leads and cleaned more thoroughly by pouring
electrical contact cleaner into the torch and blowing
it through with compressed air.
CAUTION
Dry the torch thoroughly before reinstalling.
B. Checking Center Insulator
The center insulator separates the negative and positive
sections of the torch. If the center insulator does not pro-
vide adequate resistance, current which is intended for
the pilot arc may be dissipated into the torch head, re-
sulting in torch failure.
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.