TM 9-2520-246-34-1 FRAME 2 NOTE Readings must be within limits given in table 2-20. If read- ings are not within given limits, throw away part and get a new one. 1. Measure width of two countershaft keyways (1). 2. Measure diameter of two countershaft gear surfaces (2). 3. Measure diameter of two countershaft bearing surfaces (3). GO TO FRAME 3 Index Number 1 2 3 Table 2-20. Countershaft Wear Limits Size and Fit of New Parts Item/Point of Measurement (inches) Countershaft keyway width 0.4990 to 0.5010 Countershaft gear surface diameter 2.3765 to 2.3775 Countershaft bearing surface diameter 2.0010 to 2.0015 Wear Limit (inches) 0. 5028 2.3755 2.0005 2-180