TM 9-2520-246-34 NOTE During installation, place rear bearing on the mainshaft and aline the bearing with the transmission opening. Use wooden block and mallet to drive the bearing into place. i. Fourth- and Fifth-Speed Synchronizer. Firmly apply downward pressure to the rear of the mainshaft while sliding the fourth- and fifth-speed synchronizer from the mainshaft. (See fig. 3-27.) j. Mainshaft Assembly. Hold the mainshaft in the rear position as illustrated in figure 3-28, and tilt the front of the shaft upward. Slide the mainshaft from the first and reverse gear, leaving the gear in the case. NOTE During installation, slide the mainshaft into the first and reverse gear and through the transmission case bearing opening. Figure 3-25. Removal of Input Shaft Bearing Cap. k. Idler Gear Assembly. Screw adapter (item 3, table 2-1) into idler gear shaft. Thread slide handle puller into adapter and pull idler gear shaft from housing. (See fig. 3-29.) Tilt idler gear. NOTE During installation, insert the idler gear shaft in the outer transmission case opening and through the idler gear assembly. Aline the shaft with the bracket opening and, using a soft hammer, drive the shaft into position. The indentation of the shaft must be alined with the outer case housing and cutaway section of the countershaft rear bearing cap. 3-14 Figure 3-26. Removal of Mainshaft Rear Bearing. l. Countershaft Rear Bearing. Hold the countershaft gears in locked position by using a wood wedge block between the gears and the transmission case. Remove the cotter pin from the countershaft assembly, the retaining nut, and the washer. (See fig. 3-30.) Figure 3-27. Removal of Fourth- and Fifth-Speed Synchronizer. NOTE When installing the retaining nut, tighten to 120-150 lb-ft torque. m. Countershaft. Slide the shaft rearward out of the front bearing. Extend the shaft out of the front bearing and extend the shaft through the rear bearing bore, then remove the countershaft assembly from the transmission case. (See fig. 3-31.) n. Countershaft Front Bearing. Using a soft drift pin and mallet, working from inside the transmission case assembly, drive the front bearing retainer from the transmission case. (See fig. 3-32.) Remove bearing from transmission case.