Welding Cable Connections; Assemble Rear Wheels; Installing Optional Spot/Stitch/Anti-Stick Module - ESAB MigMaster 250 Instruction Manual

SECTION 3
Never stand directly in front of or behind the regula-
tor when opening the cylinder valve. Always stand to
one side.
h. Using a leak test solution, such as P/N 998771 (8
oz. container) or soapy water, test for leakage
about the cylinder valve stem, the regulator inlet
connection, and the hose connections at the regu-
lator and at the Migmaster 250 for leakage. Correct
any leaks before starting work.
i. If work is to be stopped for a half-hour or more, or
the regulator is to be removed from the cylinder,
shut down the regulator as follows:
a. Close the cylinder valve.
b. Release gas from the regulator by closing the
torch trigger lever.
c. When pressure gauge drops to zero, the regu-
lator is de-pressurized and shutdown.
j. Each regulator is equipped with a porous metal
inlet filter, P/N 71Z33, pressed into the regulator
inlet nipple. No. regulator should be connected to
a cylinder or station valve unless it contains this
filter. You can replace the filter if you have reason
to do so. To remove a filter refer to the regulator
instruction literature for details.
k. Regulators in need of repair should be returned to
your Welding Equipment distributor or to an autho-
rized Remanufacturing Center.
If welding is performed in a confined area, shielding
gas leaks could result in a buildup of shielding gas
concentration, displacing oxygen, thereby endan-
gering personnel enter the area.

3.7 WELDING CABLE CONNECTIONS

Connect the work clamp solidly to the workpiece or work
table. Clamp onto a bare metal area.
A good electrical connection to the work is essential
to proper welding operation and to prevent electric
shock.
Welding cables should be kept as short as possible and
be of adequate current carrying capacity. Resistance of
the welding cables and connections causes a voltage
drop which is added to the voltage drop of the arc.
Excessive cable resistance may result in a reduction of
the maximum usable current output of the equipment.
The proper operation of this equipment is to a large extent
dependent on the use of welding cables and connections
which are in good condition and of adequate size.

3.8 ASSEMBLE REAR WHEELS

The unit's running board is factory assembled except for
the rear wheels which are packed loose in the shipping
carton. The rear gear consists of 2-wheels, 4-washers,
2-cotter pins, and an axle. To install the gear, do the
following:
a. Insert the axle through the holes provided at the
rear of the gear.
b. Place a washer onto each end of the axle, then slip
on the wheels, then add another washer to the
outside of each wheel, and secure the whole as-
sembly by inserting a pin in each end of the axle.
c. Remove the existing shipping supports by un-
screwing from chassis.
3.9 INSTALLING OPTIONAL SPOT/STITCH/ANTI-
STICK MODULE
a. Remove lower blank-cover plate from upper-right
front panel of power supply -- save the four mount-
ing screws.
b. Locate the harness-connected 15-pin plastic plug,
P3, inside the mounting cavity. Note that this plug
will have a jumper plug with jumper wires con-
nected to it -- remove (and save) the jumper plug.
(The jumper plug must be reinstalled if the module
is ever removed.
c. Connect the 15-pin plug into the matching recep-
tacle on the rear of the optional control module. The
plug will only fit one way.
d. Install the control module in place of the blank
panel removed in Step a., using the same four
screws that you saved.
20
INSTALLATION