TM-9-2520-246-34
TRANSMISSION MODEL 3052, NSN 2520-00-347-4520
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT; MAINTENANCE MANUAL
MAY 1978
TM-9-2520-246-34 - Page 92 of 153
TM 9-2520-246-34
drag when turned by hand. If test indicates bearings
assemblies are turned by hand from inside the case.
are too tight or too loose, shims must be added or
Position cover on case and secure with four capscrews
removed as directed in
b
below.
and lockwashers. Tighten to 60-77 lb-ft torque.
b. Add or Remove Shims.
Remove four capscrews
c. Add Shim.
When slight drag adjustment has
and lockwashers holding the idler shaft rear bearing
been obtained, remove cover and add one 0.005-inch
cover (fig. 4-35) to case. Remove cover and add or
shim. Install cover (b above). This will provide and
remove shims as required to obtain a slight drag when
ensure the proper end play.
Section Vlll. REPAIR AND REPLACEMENT STANDARDS
(MODEL T-136-21)
4-33. GeneraI.
The repair and replacement
standards included herein provide the minimum,
maximum, and key clearances of new parts. (See fig.
4-46, 4-47, 4-48, 4-49, and 4-50, and corresponding
tables 4-5, 4-6, 4-7, and 4-8.) Standards also provide
wear limits which indicate the point to which a part or
parts may be worn before replacement is required, in
order to receive maximum service with minimum
replacement. Normally, all parts which have not been
worn beyond the dimensions shown in the "Wear
Limits" column, or damaged by corrosion, will be
approved for service. An asterisk (*) in the “Wear
Limits” column. indicates that the part or parts should
be replaced when worn beyond the limits given in the
“Size and Fit of New Parts” column. In the “Size and
Fit of New Parts” and “Wear Limits” column, the
letter L indicates a loose fit (clearance) and a letter T
indicates a tight fit (interference).
4-34. Repair and Replacement Standard Points
of Measurement.
Figures 4-46, 4-47, 4-48, 4-49, and
4-50. and corresponding tables 4-5, 4-6, 4-7 and 4-8,
provide the repair and replacement standard points of
measurement for transfer model T-136-21.
4-35. Sprags and Energizing Springs.
NOTE
When checking sprags, the anvil end and
spindle of the micrometer and flat backs of
the sprag must all rest on a flat surface (fig.
4-46), to make sure they are in the same
plane. If three or more sprags are worn to
a size 0.375 inch or smaller, replace sprag
unit with new sprags.
a.
Since the wear on all sprags in any one sprag
unit will be quite uniform, it is only necessary to
inspect two or three sprags in each assembly.
b.
Inspect the sprags for evidence of wear on the
cam surface which contacts the inner race. If the wear
on the inner edge of the sprag is not more than 1/16
of an inch wide, the sprag is still usable. This
inspection procedure is shown in fig. 4-46.
c.
Inspect the energizing springs for evidence of wear,
kinking, or twisting. If any of the above defects are
present, replace the spring with a new one.
Figure 4-46. lnspecting Sprags for Wear.
4-31
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