TM 9-2520-246-34-1 c. Countershaft Assembly. FRAME 1 NOTE Readings must be within limits given in table 2-10. If readings are not within given limits, throw away part 1. 2. 3. 4. 5. Measure Measure Measure Measure Measure and get a new one. inside diameter of bearing (1). thickness of thrust washer (2) drive gear bore (3). fifth gear bore (4). diameter of countershaft journal (5). GO TO FRAME 2 Table 2-10. Countershaft Drive and Fifth Gear Wear Limits Index Number 1 2 3 4 5 Item/Point of Measurement Bearing inside diameter Thrust washer thickness Drive gear bore Fifth gear bore Countershaft journal diameter Size and Fit of New Parts (inches) 1.7332 to 1.7337 0.0598 1.995 to 2.0005 2.2495 to 2.2505 1.7317 to 1.7322 Wear Limit (inches) 0.001 0.007 None None 0.002 2-56