Tweco Max 300 w-TD-750 - Manual (Page 37)

Manual 0-2557 31 SERVICE
3. Torch is being moved too fast across workpiece
a. Reduce cutting speed (refer to Appendix II, Cut-
ting Speed Charts).
4. Excessive oil or moisture in torch
a. Hold torch 1/8 inch (3 mm) from clean surface
while purging and observe oil or moisture
buildup (do not activate torch)
F. No gas flow
1. Gas not connected or pressure too low
a. Check source for at least 70 psi (4.8 BAR).
2. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if neces-
sary. Refer to Section 5.09, Torch and Leads
Troubleshooting.
3. Faulty components in power supply system components
a. Return for repair or have qualified technician
repair per Service Manual.
G. Torch cuts but not adequately
1. Current set too low at power supply
a. Increase current setting
2. Torch is being moved too fast across workpiece
a. Reduce cutting speed (refer to Appendix II or
III, Cutting Speed Charts).
3. Excessive oil or moisture in torch
a. Hold torch 1/8 inch (3 mm) from clean surface
while purging and observe oil or moisture
buildup (do not activate torch)
5.06 Servicing Machine Torch
Components
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 on the front panel of the Con-
trol Module is ON.
A. Removing Machine Torch Head
1. Remove the shield cup, tip, gas distributor and elec-
trode from the torch head assembly.
2. Unscrew the positioning tube from the torch adap-
tor on the torch head assembly and slide the posi-
tioning tube brack over the leads.
3. Unscrew the torch adaptor from the torch head as-
sembly. Slide the torch adaptor back over the leads
to expose the plasma (+), secondary, coolant sup-
ply (-), and coolant return connectors.
Positioning Tube
Torch Adaptor
Lead Connections
A-00663
Bushing
Pinion Assembly
Machine
Torch Head
Figure 5-5 Torch Mounting Assembly
4. Disconnect the plasma (+), secondary, coolant sup-
ply (-), and coolant return connectors to allow re-
moval of the torch head. Note the location of the
torch leads insulator which separates the negative
and positive leads.
Plasma (+) Lead
Coolant Return Lead
(LH Threads)
Secondary
Lead
Coolant
Supply (-) Lead
A-00664
Figure 5-6 Torch Head Removal
B. Reassembling Machine Torch Assembly
1. Connect the plasma (+), secondary, coolant supply
(-), and coolant return connectors.
NOTE
On a machine torch, the control leads are not used.
The two connectors are taped to the leads cover-
ing.