TM 9-2520-246-34-1 b. Air Cylinder Shifter Shaft Assembly. FRAME 1 1. Check that shifter shaft (1) is not bent or cracked. Throw away bent or cracked shifter shaft. 2. Check that shifter fork (2) is not bent or cracked. Throw away bent or cracked fork. NOTE Readings must be within limits given in table 2-16. If readings are not within given limits, throw away part and get a new one. 3. Measure diameter of shifter shaft (1). 4. Measure width of two shifter fork pads (3). 5. Measure to check that shifter fork pads (3) are perpendicular to shifter fork bore (4). 6. Measure height of spring (5). END OF TASK Table 2-16. Air Cylinder Shifter Shaft Assembly Wear Limits Index Number 1 3 3 and 4 5 Item/Point of Measurement Shifter shaft outside diameter Shifter fork pad width Shifter fork perpendicularity of pad to bore Free height of spring Size and Fit of New Parts (inches) 0.8715 to 0.8725 0.562 to 0.572 0.005 2.64 to 2.85 Wear Limit (inches) 0.8685 0.5550 0.030 2.55 minimum 2-176