GENERATOR
MAINTENANCE
GENERATOR
REVOLVING
FIELD
The generator uses a 2 pole revolving field with an
exciter winding to excite the field and regulate the AC
output (Figure 40).
The generators AC welding output comes from the
stator windings that also supply 120 volts, or 120/240
volts,
AC, depending on model. An additional winding
supplies power for battery charging system.
To aid servicing and repair, all output leads from the
generator are marked. The lead and terminal
markings are shown on the welder wiring diagram.
MAINTENANCE
The generator normally requires little care other than
periodic inspection of the bearing, collector rings and
brushes every 500 hours.
BRUSHES
After approximately 500 hours of operation, remove
the generator brushes and inspect for wear, scoring
and general conditions.
To remove the brushes, remove the generator fan
guard and the fan. The brush guide is now accessible
and can be detached by removing the attaching
screws in the end
bell.
Before removing the brushes
from the guide, tag the leads 5 and 6 as shown by the
markings on the side of the brush holder. See Figure
41.
Unscrew the brush retaining screws and pull the
brushes from the guide.
The brush faces should have a smooth, coppery cast
to them, with no deep grooves present. If serious
grooves are noted, the slip rings should be inspected
to determine the cause for corrective purposes. If slip
ring dressing is required, your nearest qualified
electric motor or generator service shop is best
equipped to handle this job.
If brushes appear to be in satisfactory condition, and
are at least 5/16 inch in length, replace them in the
guide from which they were removed. Work the
brushes up and down in the guide to be sure there is
no sticking or binding. If they
bind,
clean out the
guide with air pressure or a small bristle brush until
the brushes slide freely in the guide. Replace the
brush retainer screws.
If brushes are worn to less than 5/16 inch length,
replace with new brushes. See Figure 41 for com-
parison scale.
When replacing brushes, do not use a substitute
brush.
It may look identical but may have entirely
different electrical characteristics.
ENGINE TO GENERATOR
ADAPTER-
END BELL
COVER
BLOWER
END BELL
BRUSH HOLDER
AND BRUSHES
FIGURE 40. GENERATOR ASSEMBLY
36
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