Lincoln Electric IM10155 SAE-300 HE - Manual (Page 21)

D-2
MAINTENANCE SAE-300 ® HE
Replace brushes when they wear within 1/4” of the pigtail. A
complete set of replacement brushes should be kept on hand.
Lincoln brushes have a curved face to fit the commutator. Have an
experienced maintenance person seat these brushes by lightly
stoning the commutator as the armature rotates at full speed until
contact is made across the full face of the brushes. After stoning,
blow out the dust with low pressure air.
To seat slip ring brushes, position the brushes in place. Then slide
one end of a piece of fine sandpaper between slip rings and brushes
with the coarse side against the brushes. With slight additional
finger pressure on top of the brushes, pull the sandpaper around the
circumference of the rings - in direction of rotation only until
brushes seat properly. In addition, stone slip ring with a fine stone.
Brushes must be seated 100%.
Arcing or excessive exciter brush wear indicates a possible
misaligned shaft. Have an authorized Field Service Shop check and
realign the shaft.
NAMEPLATES
Whenever routine maintenance is performed on this machine or at
least yearly - inspect all nameplates and labels for legibility.
Replace those which are no longer clear. Refer to the parts list for
the replacement item number.