Tweco PCM-62 Machine Torch - Manual (Page 34)

SERVICE 5-6 Manual 0-2817
3. Visually check that the PIP wires, torch switch
wires, pilot lead connection, and negative lead
connections are properly connected and in good
condition (no shorts or arcing).
A-03540
Torch Trigger
PIP Pins Shield Cup
To Control
Cable Wiring
Torch Switch
Figure 5-4A HandTorch Switch and PIP Schematic
A-00458
Torch Switch
PIP Pin
PIP Pin
Shield Cup
To Control
Cable Wiring
Figure 5-4B Machine Torch Switch and PIP
Schematic
• If problems are evident, repair or replace as
required.
• If there are no visual problems, then proceed
to Step 4.
4. Check the pilot lead, negative lead and switch con-
trol wires for opens from one end of the torch leads
to the other.
• If open, replace leads or open component of
the Torch Leads Assembly.
• If not open, then proceed to Step 5.
5. Check the pilot and switch control wires for shorts
to other components in the Torch Leads.
• If shorted, then replace Torch Leads.
• If not shorted, then proceed to Step 6.
6. Carefully reassemble the components and recheck
the completed assembly per paragraph ‘B’, Step
3 to confirm that the components have been prop-
erly assembled.
This completes the checks for the proper operation of the
Torch Head and Torch Leads.
5.07 Servicing Hand Torch (PCH)
Components
WARNINGS
Disconnect primary power to the system before dis-
assembling the torch, leads, or power supply.
NEVER touch any internal torch parts while the
AC indicator light on the Power Supply is ON.
A. Removing the Hand Torch Assembly
The removal of the torch head assembly requires dis-
assembly of the torch handle and leads per the fol-
lowing procedure:
1. Remove the five screws from the torch handle as-
sembly. Pull the halves apart and set aside.
A-02823
Handle Screws
(Five Places)
Handle Half
Figure 5-5 Torch Handle Screw Removal
2. Disconnect all wire connectors.
3. Slide the insulation sleeve on the Pilot Lead back
towards the Lead.
4. Remove the screw and star washer securing the
Pilot Lead to the head assembly.
5. Slide the insulation sleeving on the Negative /
Plasma Lead back towards the Lead.
NOTE
Some units may have shrink on tubing instead of
insulation sleeving. If this is the case, remove the
shrink on tubing from the Negative / Plasma Lead,
being careful not to damage the lead under the
shrink on tubing.