TM 9-2520-246-34-1 d. Countershaft Assembly. FRAME 1 1. 2. 3. 4. Measure Measure Measure Measure NOTE Readings must be within limits given in table 2-19. If read- ings are not within given limits, throw away part and get a new one. two inner bearing races (1) and two outer bearing races (2). two gear bores (3). keyway width (4) in two gears. width of two keys (5). GO TO FRAME 2 Table 2-19. Coutershaft Gears and Bearings Wear Limits Index Number 1 2 3 4 5 Item/Point of Measurement Bearing inner race diameter Bearing outer race diameter Gear bore Gear keyway width Key width — Size and Fit of New Parts (inches) 2.000 to 2.0005 4.000 to 4.0010 2.375 to 2.376 0.5000 to 0.5025 0.5000 to 0.5010 Wear Limit (inches) None None 2.3765 0.5052 None 2-179