TM-9-2520-272-40 Direct Support for M113A3 X200-4A Transmission 2520-01-397-1074 Download
Page 513 of 620
TM 9-2520-272-40 0063 SUSTAINMENT MAINTENANCE CHECK OUTPUT SHAFT DRAG, LEFT AND RIGHT SIDE INITIAL SETUP: Tools and Special Tools Chisel, Cold, 3/8”, Flat (WP 0079, Item 7) Socket, Socket Wrench, 1/2” Drive, 1-1/2” Spline (WP 0079, Item 38) Tool Kit, General Mechanic’s (GMTK) (WP 0079, Item 45) Wrench, Torque, Ratcheting, 1/2” Drive, 250 lb-ft (WP 0079, Item 51) Personnel Required Track Vehicle Repairer, 91H10 References WP 0065 WP 0066 Equipment Condition All maintenance actions have been completed When the left or right cover has been removed and maintenance work has been performed on either cover, or the left or right end of the center housing, the output shaft(s) on the side(s) where the work was performed must be given a drag check. This check will indicate if an assembly error exists such as omission of a spacer or gear or binding of parts. The output shaft drag check is performed after assembly of the transmission has been completed. The transmission must be on the work table or on the f oor in the normal upright operating position. The output shaft drag check is performed on a dry transmission (i.e., a transmission not f lled with oil). Each output shaft in a dry transmission should rotate with the application of 20 lb-ft (27 N·m) of torque. When rotation of the output shaft produces a torque reading higher than 20 lb-ft (27 N·m), the side with the faulty drag must be disassembled and checked for missing parts or parts improperly installed. NOTE A high drag check torque reading on a wet transmission should not be interpreted as an indication of a problem. For example, a transmission full of oil may produce a normal drag check reading of 50 lb-ft (68 N·m) or more because of all the oil being moved around. However, an uneven drag check reading, such as 50 lb-ft (68 N·m) on one shaft and 40 lb-ft (54 N·m) on the other shaft, would indicate something binding in the side with the higher reading. When there is excessive drag on one output shaft, there will probably also be excessive drag on the other output shaft. The output shaft with the higher torque reading represents the side of the transmission which must be disassembled. 0063‐1