8
3.1 GENERAL
Before any maintenance is attempted on this
torch, make sure the power switch on the console
is in the "OFF" position and the primary input is
deenergized.
3.2 INSPECTION AND CLEANING OF
CONSUMABLES
A. Disassemble the front end of the PT-27 as
follows:
1. Position torch head in a downward direction
(refer to Figure 2-1) and remove the shield.
The nozzle, swirl baffle, and electrode will
drop from the head and remain in the shield.
Remove these components and inspect for
wear. The nozzle and electrode will generally
wear at the same rate. For best performance,
replace together.
2. Nozzle: Replace if the orifice is clogged, nicked,
or out-of-round.
3. Electrode: See Figure 3-1 for electrode main-
tenance.
4. Shield: The face of the shield will gradually
erode from the heat and molten metal spray.
Replace the shield if more than 1/8 inch (3.2
mm) has eroded from the face. Refer to Figure
3-1.
5. Swirl Baffle: This is a ceramic part and may
crack or chip if dropped. Always replace if
cracks or chips are present.
6. O-ring: Lubricate as per Figure 3-1. Replace
if cut or worn. Air leaking past this seal will
reduce cutting performance.
B. To replace the above front end components,
refer to Figure 2-1.
HEAT SHIELD
Figure 3-1. O-ring, Electrode, and Shield Maintenance
LUBRICANT (P/N 17672) CAN BE
APPLIED TO O-RING OR HEAT SHIELD.
THE HEAT SHIELD FACE WILL
GRADUALLY ERODE WITH USE.
SEE PARAGRAPH 3.2.A.4.
19/32"
(15.1 mm)
REPLACE ELECTRODE BEFORE
LENGTH BECOMES SHORTER THAN 19/
32 INCH -
(15.1 mm).
O-RING
ELECTRODE
SECTION 3 MAINTENANCE
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