TM 9-2520-246-34 CHAPTER 4 REPAIR OF TRANSFERS Section I. DESCRIPTION, OPERATION, AND DATA (MODEL T-136-27) 4-1. General. This chapter provides the repair instructions for positive locking transfer model T-136- 27. (See fig. 4-1 and 4-2.) 4-2. Description and Operation. a. Description. The positive locking transfer is a two-speed synchromesh unit with front and rear output shafts. The transfer unit is driven by the regular 5-speed transmission through a propeller shaft. Low or high gear selection through the transfer gives the truck a total of ten forward gears, and two reverse gears. With the operation of an air selector valve (fig. 4-1), the air locking assembly engages the front output shaft to the rear output shaft to drive the front axle. The transfer distributes the power to front and rear axles through the propeller shafts. The handbrake drum is mounted in the transfer rear output shaft companion flange. (See fig. 4-2.) The handbrake inner and outer brakeshoe and lever assembly is supported on the transfer rear output rear bearing cover. b. Operation. The selection of high or low range in the transfer is accomplished by a shifting mechanism, which moves the synchronizer into contact with the input-shaft low-speed gear or the input-shaft high- speed gear. With positive locking engaged, power is distributed to front and rear axles when transmission is placed in the selected gear. (1) Low Range. When the transfer is shifted to low range, the synchronizer assembly is moved forward on the input shaft to engage the input-shaft low-speed gear which is in mesh with the countershaft low-speed gear. Because the low-speed gear is keyed to the countershaft, the power flow is through the countershaft gears, to the rear (and front if lock-up assembly is engaged) output-shaft gears and to the companion flanges. Figure 4-1. Positive Locking Transfer Model T-136-27 — Front View. 4-1