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Page Title:
Section VI. REPAIR AND REBUILD STANDARDS |
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 Section VI.
REPAIR AND REBUILD STANDARDS
limits" column or damaged from corrosion
39. General
will be approved for service. An aster-
isk (*) in the "Wear limits" column indi-
The repair and rebuild standards listed
give maximum, minimum, and key clearances
cates that the part or parts should be re-
of new or rebuilt parts.
They also give
placed when worn beyond the limits given
in the "Sizes and fits of new parts" col-
wear limits which indicate that point to
umn. In "Sizes and fits of new parts"col-
which a part or parts may be worn before
umn, the letter "L" indicates a loose fit
replacement, in order to receive maximum
and the letter "T" indicates a tight fit.
service with minimum replacement.
Nor-
mally, all parts which have not been worn
All dimensions are given in inches unless
beyond the dimensions shown in the "Wear
otherwise specified.
40. S t a r t e r A s s e m b l y S t a n d a r d s
Armature
and
a.
Wear
limits
Fig.
Ref.
Sizes and fits
Field
Depot
No.
letter
Point of measurement
of new parts
maint
maint
OD of bearing ----------------
a
0.7545 to
0.7555
48
ID of bearing -----------------
b
0.6260 to
0.6270 0.6310
0.6290
Dia of bearing bore in head ---
c
0.7150 to
0.7520
Fit of bearing in head - - - - - - -
a-c
0.0025T to
0.0045T
d
OF of commutator end of armature
shaft ---------------------------
0.6239 to 0.6250 0.6234
0.6238
Fit of shaft in bearing -------
b-d
0.0010L to 0.0031L 0.0076L
0.0052L
Commutator diameter -----------
1.6800
e
f
OD of drive end of armature shaft
(large dia) ------------------
0.8700
0.8700
to
0.8720
0.8696
g
OD of drive end of armature shaft
(small dia) ------------------------
0.7456
to
0.7465
0.7451
0.7456
h
Dia of bearing bore in inter-
mediate bearing retainer -----
0.9995
to 1.0005
ID of bearing -----------------
j
0.8725
to 0.8745 0.8785
0.8765
Fit of shaft in bearing -------
f-j
0.0005L
to 0.0045L 0.0089L
0.0065L
OD of bearing --------------------
k
1.0030
to 1.0040
h-k
Fit of bearing in intermediate
retainer
---------------------
0.0025T to 0.0045T
Drive spring:
l
Free length ------------------------
2.21
Lbs compression at 1.81-inch
length ---------------------
20 lbs
ID of bearing ------------------
m
0.7505
0.7475 to
0.7485 0.7525
Fit of shaft in bearing -------
g-m
0.0010L to
0.0029L 0.0074L
0.0049L
OD of bearing ------------------
n
0.8780 to
0.8790
Dia of bearing bore in housing
0.8745 to
0.8755
P
Fit of bearing in housing -----
n-p
0.0025T to
0.0045T
b.
Brushes and Return Spring.
Return spring:
a
49
Free length -----------------
2.078
Lbs compression at 1.25-inch
length ---------------------
41.7
lbs
Brush length ------------------
0.750
a
50
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