Lincoln Electric Classic 300 MP Service Manual page 54

LINCOLN ELECTRIC Classic® 300 MP Service Manual
The brushes should be seated so that the face of each brush makes 95% minimum contact with the
commutator. Lightly stone the commutator to seat the brushes. See caution note on commutator
stone usage.
Examine the brush holders:
The brush holder insulators must be clean and in good condition and all of the hardware must be in
place. Replace any insulators that are cracked or damaged in any way.
When installing the brush holders, they should be rotated toward the brush retainer (clockwise
rotation when facing the brush holder mounting screw.) until they stop. The edge of the brush
holder plate should be parallel with the surface of the commutator and positioned .030 to .090 from
the surface of the commutator. The brush holder mounting screw tightened to a torque of 24 to 28
Ft/lbs.
The brush holder plate and retainer assembly must be clean and smooth; nothing should prevent
free movement of the brushes. All electrical connections to the brush holders must be clean and
tight.
Figure F.21 – Generator cover location
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