Tweco Maximizer 300 Torch for BNFL - Manual (Page 34)

SERVICE 5-4 Manual 0-2990
4. Tilt the torch head to remove the gas distributor. The
end of the multipurpose wrench can be used to help
remove the gas distributor. Check for excessive wear,
plugged gas slots, or discoloration. Replace if neces-
sary.
5. Using the multipurpose wrench (electrode area) re-
move the electrode. Refer to Figure 5-4 and check the
face of the electrode for excessive wear.
Worn Electrode
New Electrode
A-00256
Figure 5-4 Electrode Wear
6. Install the electrode and tighten with multipurpose
wrench. Do not over tighten the electrode. The cir-
cular area around the wrench used for electrodes will
also align the electrode in the torch head. This will
prevent installing electrodes on an angle and cross
threading the electrode in the torch head.
7. Install the gas distributor.
8. Install the tip and tighten with the multipurpose
wrench. Do not over tighten the tip.
CAUTION
Make sure both the tip and electrode correspond
with the plasma and secondary gases being used,
the current range, and the type of operation. Refer
to Section 4.04, Torch Parts Selection.
9. Hand tighten the shield cup body and end cap until it
is seated on the torch head. If resistance is felt when
installing the cup, check the threads before proceed-
ing.
5.05 Troubleshooting Guide
A. Troubleshooting
This Sub-Section covers troubleshooting that requires
disassembly and electronic measurements. It is helpful
for solving many of the common problems that can arise
with this torch assembly.
B. How to use this Guide
The following information is a guide to help the Cus-
tomer/Operator determine the most likely causes for
various symptoms.
This guide is set up in the following manner:
X. Symptom (Bold Type)
Any Special Instructions (Text Type)
1. Cause (Italic Type)
a. Check/Remedy (Text Type)
Locate your symptom, check the causes (easiest listed first)
then remedies. Repair as needed being sure to verify that
the unit is fully operational after any repairs.
A. Torch will not pilot when torch switch is activated
1. Power Supply RUN/SET/PURGE switch in SET po-
sition
a. Place RUN/SET/PURGE switch to RUN posi-
tion.
2. Torch switch activated during power on purge
a. Release torch switch and wait at least 20 sec-
onds before activating switch again
3. Faulty torch parts
a. Inspect torch parts and replace if necessary. Re-
fer to Section 5.04, Inspection and Replacement
Consumable Torch Parts
4. Gas pressure too high
a. Set pressure to 65 - 75 psi (4.5 - 5.2 bar)
5. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.07, Torch and Leads
Troubleshooting.
6. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.