Tweco PAK 200i - Manual (Page 70)

PAK 200i
7-� TORCH INFORMATION Manual 0-5335
1. Remove the shield cup, tip, gas distributor, and electrode from the torch. Disconnect the torch leads from
the power supply to isolate the torch from power supply circuits.
�. Using an ohmmeter (set to 10K or higher), check for continuity between the positive and negative torch
fittings. Infinite resistance (no continuity) should be found. If continuity is found, refer to "7.08 To r c h
And Leads Troubleshooting" on page 7-10.
C. Torch O-ring Lubrication
The internal o-rings on the Torch Head assembly (electrode, gas distributor and tip) require lubrication on a
scheduled basis. This will allow the o-rings to remain pliable and provide a proper seal. The o-rings will dry
out, becoming hard and cracked, if the o-ring lubricant is not used on a regular basis. This can lead to potential
leaks internally and externally. Failure of o-rings that seal against outside “air” entering the torch assembly
can cause severe contamination. These contaminants can destroy or shorten the parts life of tips, electrodes,
and internal torch parts.
It is recommended to apply a very light film of o-ring lubricant, (Catalog Number 8-40�5), to the internal Torch
Head assembly o-rings on a weekly basis.
NOTE
DO NOT use other lubricants or grease, they may not be designed to operate within high temperatures or may contain
“unknown elements” that may react with the atmosphere. This reaction can leave contaminants inside the torch.
Either of these conditions can lead to inconsistent performance or poor parts life.
7.03 Common Operating Faults
The following lists the more common cutting faults and what is the possible cause:
1. Insufficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
f. Non-Genuine Thermal Dynamics Parts
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Cutting current too high
d. Work cable disconnected
e. Worn torch parts
f. Non-Genuine Thermal Dynamics Parts
3. Excessive Dross Formation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
d. Improper cutting current
e. Non-Genuine Thermal Dynamics Parts