Tweco Max 300 w-TD-750 - Manual (Page 34)

SERVICE 28 Manual 0-2557
C. Torch O-ring Lubricate
The internal o-rings on the torch head assembly (elec-
trode, gas distributor and tip) require lubricating on a
scheduled basis. This will allow the o-rings to remain
pilable and provide a proper seal. The o-rings will
dry out, becoming hard and cracked, if the o-ring lu-
bricant is not used on a regular basis. This can lead to
potential leaks internally and externally. Failure of o-
rings that seal against outside “air” entering the torch
assembly can cause severe contamination. These con-
taminants can destroy or shorten the parts life of tips,
electrodes, and internal torch parts.
It is recommended to apply a very light film of o-ring
lubricant, Catalog Number 8-4025, to the internal torch
head assembly o-rings on a weekly basis.
NOTE
DO NOT use other lubricants or grease, they may
not be designed to operate within high tempera-
tures or may contain “unknown elements” that
may react with the atmosphere. This reaction can
leave contaminants inside the torch. Either of these
conditions can lead to inconsistent performance or
poor parts life.
5.03 Common Operating Faults
The following lists the more common cutting faults and
what is the possible cause:
1. Insufficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
f. Non-Genuine Thermal Dynamic Parts
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Cutting current too high
d. Work cable disconnected
e. Worn torch parts
f. Non-Genuine Thermal Dynamic Parts
3. Excessive Dross Formation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
d. Improper cutting current
e. Non-Genuine Thermal Dynamic Parts
4. Short Torch Parts Life
a. Oil or moisture in air source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Air flow too low (incorrect pressure)
e. Improperly assembled torch
f. Output current too high
g. Torch tip contacting workpiece
h. Damaged or loose torch head components
i. Non-Genuine Thermal Dynamic Parts
5. Poor Pilot Starting
a. Non-Genuine Thermal Dynamic Parts
b. High coolant conductivity
Refer to Power Base Unit Manual 0-2474
5.04 Inspection and Replacement
Consumable Torch Parts
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.
Remove the consumable torch parts per the following
procedure (See Note):
NOTE
A multi-purpose wrench is supplied for changing
the tip, electrode and gas distributor in the torch
head.