d. Cleaning, Inspection, and Repair.
second inch below the commutator bars,
either by hand or by machine.
(1) Clean all metal parts with an approved
Inspect all stator assemblies and field
cleaning solvent and dry thoroughly.
coils for defective insulation, broken leads,
(2) Inspect the brush holders, brush holder
or other defects.
rings, plates, and brush spring assemblies
windings, leads, or insulation.
for breaks, cracks, or other damage.
Inspect the terminal boards for cracks,
Replace all parts found to be defective.
breaks, defective terminals or terminal
(3) Clean a slightly dirty or discolored
Replace a defective
commutator with No. 00 sandpaper. Blow
terminal board or components.
sand, dust, and dirt from the armature with
Inspect each frame member for cracks or
clean, dry, compressed air.
breaks. Weld minor cracks and replace a
Inspect each panel of the generator box
for cracks, dents, and defective mounting
hardware. Straighten dents, weld cracks,
Do not use emery paper or emery
and replace defective mounting hardware.
cloth on any commutator.
Replace a badly; damaged panel.
(4) Inspect the armature shaft bearing surface
Inspect the conduit assembly for cracks'
for wear or damage. Examine the bearing
and breaks. Replace a damaged conduit
for wear, galling, roughness, or other
damage. Replace a damaged bearing.
Inspect the generator-welder base for
(5) Inspect the electrical contac t ring
cracks, breaks, and damaged mounting
assembly for roughness, wear, and
hardware. Weld cracks and minor breaks.
If defects cannot be
Replace damaged mounting hardware.
corrected, replace the electrical contact
(6) Inspect the welder commutator and the
generator commutator for roughness,
wear, or eccentricity.
commutator runout with a dial indicator.
(2) Refer to TM 5-4940-200-12 and install the
Place the armature assembly in a lathe
end cover, rear shaft guard, end
and turn a commutator that is 0.003 inch
wrappers, and air filters.
or more out-of-round. Make light cuts until
the commutator is cleaned.
(7) Undercut the mica separators in the
commutator to a depth of one thirty
Section VII. CONTROLS AND INSTRUMENTS
generator, and as a source of direct current for engine
The control panel for the generator-welder is located
in the front compartment of the left side of the shop set
Controls and Instruments
body. It contains all the instruments necessary to
operate the generator-welder as an arc welder, a
battery-charging generator, an alternating current