TM 9-2520-246-34-1 b. Countershaft Assembly. FRAME 1 NOTE Readings must be within limits given in table 2-41. If readings are not within given limits, throw away part and get a new one. 1. Measure high range gear bore (1) and high range gear keyway width (2). 2. Measure countershaft diameter (3) in two places and two countershaft keyway widths (4). 3. Measure two key widths (5). 4. Measure low range gear bore (6) and low range gear keyway width (7). GO TO FRAME 2 Index Number 1 2 3 4 5 6 7 2-202 Table 2-41. Countershaft Assembly Wear Limits Item/Point of Measurement High range gear bore High range gear keyway width Countershaft diameter Countershaft keyway width Key width Low range gear bore Low range gear keyway width Size and Fit of New Parts (inches) 2.3750 to 2.3760 0.5000 to 0.5032 2.3765 to 2.3775 0.4984 to 0.5000 0.5000 to 0.5012 2.3750 to 2.3760 0.5000 to 0.5032 Wear Limits (inches) 2.3765 0.5052 2.3755 0.5024 None 2.3765 2.3765