16
USER MANUAL
JEFMIG151-A
151A MIG WELDER - 230V 50Hz
www.jeffersontools.com
14. Maintenance
Periodically open the access panel from the unit and, using compressed air, blow out all dust and debris from the interior.
Inspect all air vents and cooling slots to ensure that they are clean and unobstructed.
Always store the welder in a clean, dry, safe location out of reach of children and other unauthorized people.
14.1.
Wire feed unit:
14.1.1 Check the wire feed unit at regular intervals. The feed roller wire guide plays an
important part in obtaining consistent results. Poor wire feed affects the weld.
Clean the rollers weekly, especially the feed roller groove, removing all dust
deposits.
14.2.
Torch:
14.2.1 Protect the torch cable assembly from mechanical wear. Clean the liner from
the machine forwards by using compressed air. If the liner is blocked it must
be replaced.
14.3.
Turning feed roller IMPORTANT: Turn the feed roller to suit the wire size.
14.3.1 There are two grooves on the feed roller, 0.6mm and 0.9mm. Always have
the groove that is being used on the outside of the roller (nearest to you). To
turn the feed roller first loosen the wire tension knob and move it into its up
position (see fig.14-1) then move the tensioning roller assembly to its down
position (see fig.14-2). Take hold of the triangular knob on the roller retainer
and rotate it 90°anticlock wise to release it as shown in fig.14.3. Now pull
the roller retainer off the drive spindle to reveal the roller as shown in fig.15.
Pull the roller off the drive spindle, flip it over and put it back on the drive
spindle. (See fig.16) The groove size you require should now be visible on
the face of the roller. Push the roller retainer back onto the drive spindle with
the opening facing right. Ensure that the flanges at the base of the retainer,
seat fully into the circular recess in the main moulding and then rotate the
retainer through 90° to lock it in place.
14.4.
Contact tip (to remove tip follow steps in 6.1.8):
14.4.1 The contact tip is a consumable item and must be replaced when the bore
becomes enlarged or oval. The contact tip MUST be kept free from spatter.
14.5.
Gas cup (to remove cup follow steps in 6.1.8):
14.5.1 The gas cup must also be kept clean and free from spatter. Build-up of
spatter inside the gas cup can cause a short circuit at the contact tip which
will result in expensive machine repairs.
14.6.
Replacing wire liner:
14.6.1 A worn or damaged wire liner will seriously affect the performance of the
welder and should be immediately replaced. First wind the wire back onto
the spool and secure it. Remove the four screws securing the torch cable
clamp to the wire feed unit (fig.17) and take off the clamp.
14.6.2 To open the torch case first take hold of the locking ring (fig.18-5) and turn
it anticlockwise until it stops and then pull it off the two halves of the torch
case and slide it a little way down the torch cable.
14.6.3 Lift up the back of the upper torch moulding as shown in fig18-1 and
unhook it from the front of the lower moulding (see 7 in fig.18) and lift it off.
14.6.4 Move the lower moulding away from the inner torch assembly as shown in
fig19-4.
WARNING:
Before performing any maintenance on the Welder, unplug the Power Cable from the electrical outlet and
allow all parts of the welder to cool thoroughly
FIG. 16
FIG. 15
FIG. 14
