Tweco Pak 200 - Manual (Page 87)

Manual 0-5057 7-7 TORCH MAINTENANCE
TORCH MAINTENANCE PAK 200
5. Unscrew the torch adaptor from the Torch Head
assembly. Slide the torch adaptor back over the
leads to expose the plasma (+), secondary, coolant
supply (-), and coolant return connectors.
Positioning Tube
Torch Adaptor
Lead Connections
A-00663
Bushing
Pinion Assembly
Machine
Torch Head
Figure 7-7: Torch Mounting Assembly
6. Disconnect the plasma (+), secondary, coolant
supply (-), and coolant return connectors to allow
removal 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-02198
Figure 7-8: Torch Head Removal
B. Reassembling Machine Torch Assembly
NOTE
Verify that the small rubber duck valve is in
torch plasma fi tting.
1. Remove the rigid insulator from the old Torch Head
Assembly from between the layers of Estermat
paper.
2. Slide the rigid insulator between the layers of
Estermat paper on the replacement Torch Head
Assembly (see NOTE).
NOTE
Over a period of time there may be a breakdown
of the Estermat paper causing the Torch Head
to short out if the rigid insulator is not installed.
Two Layers Of
Estermat Paper
Rigid Torch
Leads Insulator A-01577
Figure 7-9: Rigid Insulator Installation
3. Secure the rigid insulator in place with electrical
tape.
4. Slide replacement shrink on tubing on leads.
5. Connect the plasma (+), secondary, coolant supply,
(-) and coolant return connectors.
6. Secure leads and tubing with single layer of electri-
cal tape.
7. Slide the torch adapter down over the leads and
screw the adaptor securely onto the back of the
Torch Head assembly.
8. Slide the positioning tube down over the leads and
thread it into the torch adaptor on the Torch Head
assembly.
9. Apply tape to the torch leads sleeving at the back
end of the positioning tube.
10. Position shrink on tubing over the tape and shrink.
11. Install the front end torch parts.