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