e. Brush holder.: .Assemble the eight brushes and springs into the holder
in preparation for final installation (fig 28).
Brushes in holder.
f. Final assembly. First the brushes and the holder are installed into the
frame. Then, the armature is put in place so the commutator and brushes are
(1) If new brushes have been installed they must be properly seated
(a) No 2/0 sandpaper is cut the width of the commutator and is
installed between the commutator and brushes.
(b) The commutator end head is secured to the frame and the armature
rotated three to five times, in a counterclockwise direction, to seat the brushes.
(c) Remove the commutator end head and inspect for satisfactory
brush seats (fig 29).
(d) Remove armature from frame and blow away loose particles of
sanding dust from the armature and frame.
Wipe off the armature with a clean cloth dampened with
Wipe the-brushes clean with a dry cloth only.
(e) After coating the shaft and splines on the armature with grease,
install the armature and continue the assembly.
(2) In the installation of the commutator end head, make certain the
thrust washer is in place and that the scribe marks are properly alined.
(3) In the installation of the intermediate housing, don't forget the
thrust washer and to check the armature end play. The maximum end play is 0.050
OS 010, 6-P23