Tweco PAK 10 - Manual (Page 28)

Service 16 Manual No. 0-0515
If the end of the electrode is badly pitted (cavity
almost covers diameter) then that end of the elec-
trode should no longer be used.
The electrode may then be reversed. When both
ends are pitted, the electrode should be replaced.
Do not attempt to repoint the electrode.
NOTE
Remove the liner assembly (4) and sleeve (6), in
accordance with the following step, only if ei-
ther appears to be damaged and requires replace-
ment.
4. Remove the liner assembly (4) with the liner wrench
(16). After unscrewing the liner, slip out the sleeve
(6).
5. PCH-4B: Unscrew the back cap (14) and remove the
spring assembly (13) and collet assembly (12).
6. PCM-4BT: The collet (12) is removed by sliding the
collet wrench (17) into the torch cavity and unscrew-
ing it from the torch.
NOTE
The spring assembly (13) should come out with
the collet. Care must be taken not to lose this
spring.
Torch Assembly
WARNING
Disconnect primary power before assembling the
torch.
1. PCM-4BT: Insert the spring assembly (13) into the
collet (12) and install the collet in the torch cavity.
Tighten down with collet wrench (17).
2. Insert the sleeve (6) in the liner (4). The sleeve should
be clean and dry and may be either end up.
3. O-ring (5) should be lightly lubricated with O-ring
lubricant (Cat. No. 8-4025) and installed just past
the threads on the liner. Install the liner (4) in the
torch using the liner wrench (16).
4. PCH-4B: Insert the spring assembly (13) in the collet
(12) and install the collet in the back of the torch
with the end with the O-ring toward the front.
5. PCH-4B: Check the O-ring (11) that seals the back
cap to be sure it is lightly lubricated (Cat. No. 8-
4025) and in good condition.
1
3
9
5 4
1
2
6
7 8 10
PCH-4B HAND TORCH
PCM-4B MACHINE TORCH
A-03312
1. Head
2. Heat Shield
3. Handle
4. Torch Switch
5. Torch Switch Sheath
6. Back cap
7. Nut
8. Insulating Sleeve
9. Mounting tube
10. Pinion assembly
Figure 4-B Hand and Machine Torch Heads, Exploded View