8
*ADAPTOR (PART OF
CONN. BLK. ASSY).
TORCH MOUNTING
BRACKET - 633885
ST-21M MIG MACHINE
TORCH - 690509
ADJUSTABLE SLIDE
25V39
MOUNTING PLATE
493195
TORCH MOUNTING
BRACKET - 633885
ST-21M MIG MACHINE
TORCH - 690509
Fig. 1 - ST-21M Torch Direct Mounting
Fig. 2 - ST-21M Torch Remote Mounting
5. With the nozzle and contact tube removed and wire
in the feed rolls, use the inching switch on the control
to feed wire through the mounting bracket and torch
until it protrudes from the end of the torch.
6. Select the correct contact tube or tip. If using contact
tube, slip the tube and collet nut (632811) over the
wire, and screw the nut into the torch to hold the tube
in place.
7. Place a spatter liner (633603, if one is required) in
the proper size nozzle and install into the front end
of the torch.
B. REMOTE MOUNTING
Follow the steps as described above in section III-A.
except in step 3, install adaptor (61N59) in place of torch
inlet guide tip. The torch is then mounted to mounting
bracket (see Fig. 2) and conduit (with conduit liner
installed if required) is to be connected to torch and to
wire outlet guide on welding head.
IV. ADJUSTMENT AND OPERATION
Before adjustments are made, disengage the pressure
roll to prevent wire from feeding and arcing to an acci-
dental ground. To set the shielding gas flow rate, press
the weld start button to open the gas solenoid valve and
adjust the flowmeter to the desired flow rate.
Make sure the coolant system is completely filled, and
be sure to plug in the coolant recirculator before operat-
ing the torch.
Specific operation of the torch depends on the particular
wire feeder with which it is to be used. Therefore, consult
the instruction booklet supplied with the wire feeder.
When changing wires — switch to one of different size
and composition — make sure you refer to the wire Feed
Accessories Table. The listed parts are to be used for a
particular wire size — DO NOT SUBSTITUTE PARTS.
* If desired, the adaptor and the lug can be switched to the opposite sides
of the connection block.
CONNECTION BLOCK
ASSY - 58V74
WELDING
HEAD
TORCH INLET
GUIDE TIP
(SEE TABLE 2)
MOUNTING
BRACKET -
996497
CONDUIT (See Table 4)
ADAPTOR - 61N59
CONDUIT LINER
(SEE TABLE 4)
TO WELDING HEAD
(See Table 4)
