TM 9-2520-246-34 4-14. Countershaft Rear Bearing Adjustment. a. Use shims in combination to obtain 0.002- to 0.005-inch end play. b. The shims are provided as a set. The part number for the set is 7521437. The part numbers and shim sizes are: 4-15. Rear Output Shaft Rear Bearing Adjustment. a. Use shims in combination to obtain 0.002- to 0.005-inch end play. b. The shims are provided as a set. The part number for the set is 7521437, the part numbers for shim sizes are: Ordance No. Thickness Ordnance No. Thickness 7521441 .003 ± .0005 7521446 .005 ± .0005 7521447 .010 ± .001 7521277 .003 ± .001 7521278 .005 ± .001 7521279 .010 ± .001 Section IV. REPAIR AND REPLACEMENT STANDARDS (MODEL T-136-27) 4-16. General. The repair and replacement standards included herein provide the minimum, maximum, and key clearances of new parts. (See fig. 4-22, 4-23, 4-24, and 4-25 and corresponding tables 4- 1, 4-2, 4-3, and 4-4.) 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” and “Wear Limits” columns. In the “Size and Fit of New Parts” and “Wear Limits Columns”, the letter “L” indicates a loose fit (clearance) and the letter "T" indicates a tight fit (interference). 4-17. Repair and Replacement Standard Points of Measurement. Figures 4-22, 4-23, 4-24, and 4-25 and corresponding tables 4-1, 4-2, 4-3, and 4-4 provide the repair and replacement standard points of measurement for transfer model T-136-27. 4-12