TM 9-2520-246-34 b. Main Drive Gear Assembly. (1) Remove the snapring and fourth-speed gear thrust washer from mainshaft assembly. (See fig. 3- 34.) Slide the fourth-speed gear from the mainshaft. (2) Setup fixture as shown in figure 3-35. Apply pressure from the press ram and remove fourth-speed gear sleeve and third-speed gear. (3) Slide second- and third-speed synchronizer free of mainshaft. Using a pair of pliers, remove the snapring which holds the second-speed synchronizer sleeve in position. Set up press as shown in figure 3- 36. Press second- and third-speed synchronizer sleeve approximately ΒΌ inch. Do not press second-speed gear onto woodruff keys of mainshaft. Install the puller on second and third speed synchronizer sleeve as shown in figure 3-37. Continue to remove synchronizer sleeve from shaft and remove the two woodruff keys, then remove second-speed gear. Figure 3-33. Disassembly of Input Shaft Assembly. c. Countershaft Assembly. (1) Using a pair of pliers, remove snapring. Position countershaft on press as shown in figure 3- 38. Install a puller adapter under the drive gear and press the shaft from the gear. Remove woodruff key. (2) Place into press as shown in figure 3-39. Remove fourth-speed gear snapring and press the shaft. Then remove fourth-speed woodruff key. d. Mainshaft Rear Bearing Cap. Using a round suitable block, drive the oil seal from the bearing cap. (See fig. 3-40.) e. Shifter Shaft Cover Assembly. (1) Remove the interlock safety nuts and bolts. (See fig. 3-41.) Figure 3-34. Removal of Fourth-Speed Gear. (2) Using a punch and hammer, remove the expansion plugs. Clip the safety wire and loosen the four setscrews holding the shift forks and actuating lug in position. (See fig. 3-42.) Then remove the three shifter shafts. (3) Turn the shifter cover right side up and remove the poppet balls and springs. (See fig. 3-43.) (4) Pry the interlock plate up and remove the interlock plate, springs, and interlock plate spring washers. (See fig. 3-44.) (5) Drive first and reverse shifter shaft oil seal (fig. 3-45) out with punch and hammer, and discard seal. (6) Remove the lower shift lever, lockring, spring, and spring cup. (See fig. 3-46.) Slide the shifter shaft lever through the shifter shaft cover. Figure 3-35. Removal of Third-Speed Gear and Fourth- Speed Gear Sleeve. 3-16