TM 5-3820-233-35/2
24
Guide
44
Insulation
64
Plate
25
Nut
45
Screw
65
Plate and stub
26
Plug
46
Pole
66
Bushing
27
O-ring
47
Insulation
67
Plate
28
O-ring
48
Cover
68
Plate
29
Washer
49
Screw
69
Plate
30
Screw and washer
50
Gasket
70
Screw
31
Field coil
51
Washer
71
Brush
32
Lever
62
Screw
72
Lockwasher
33
0-ring
53
Nut
73
Spring
34
Snap ring
54
Lockwasher
74
Screw
35
Screw
65
Nut
75
Holder screw
36
Screw
56
Lockwasher
76
Holder
37
Housing
57
Washer
77
Lockwasher
38
Screw
58
Insulator
78
Screw
39
Housing
69
Bushing
79
Holder screw
40
Drive clutch assembly
60
0-ring
80
Screw
41
Gasket
61
Frame
81
Lockwasher
42
Washer
62
Washer
82
Washer
43
Lockwasher
63
Plate
Figure 10-3-Continued
not use any degreasing compounds or submerge the
Smooth the commutator with 00 sandpaper or under cut
armature in a degreasing tank as this would damage the
on a lathe. Replace the armature if the commutator
insulation.
bars are less than 1/16-inch thick after undercut.
(2) Clean the commutator with 00
Undercut the mica between the bars to a depth of 1/32-
sandpaper and remove sand particles with compressed
inch.
air.
(3) Clean the commutator end frame,
Caution
drive end frame, and components with an approved
Do not widen commutator slots by
solvent and dry thoroughly.
removing metal from bars when
undercutting. Use only solder with a
Caution
rosin core flux.
Do not soak insulators.
(2) Inspect the armature shaft for weal,
f.
Inspection and Repair.
pits, bends, corrosion, or breaks.
(1) Inspect
the
commutator
for
(3) Place the armature ends in V-blocks
roughness, high mica, loose winding, burrs, or pits.
and measure the commutator for out-of-round with a dial
indicator. Turn down if in excess of 0.001-inch out-of-
round.
(4) Inspect end frames for cracks and
damaged or worn bearing surfaces.
(5) Inspect brush plate for cracks and
loose rivets.
Inspect insulated brush holders for
grounds.
(6) Inspect brush springs for tension and
signs of breaks or other damage. Replace brushes.
(7) Inspect the ball bearings for smooth
operation. Inspect for excessive side play and damaged
surfaces.
Figure 11-1. Connections for checking output on
"B" circuit generators.
3-5
