TM 9-2520-246-34 Section IX. DESCRIPTION, OPERATION, AND DATA (MODEL P-136-C) 5-22. General. a. Cleaning and repair procedures are contained in Chapter 2, section III of this manual. b. Use a separate container for parts of each assembly. If more than one power takeoff is being rebuilt at one time, some provisions must be made for keeping the parts of each power takeoff separated, This is especially important when some parts are to be used again. c. Power takeoff disassembly and assembly are accomplished by following the logical step-by-step procedures. Assembly procedures are provided only where special attention to a particular part or an assembly is needed. Assembly of the power takeoff is the exact opposite of disassembly, unless otherwise specified. (Refer to para 5-27 for assembly sequence.) 5-23. Description. The power takeoff is a single drive, one-speed unit and is designed to be mounted only on transfers. The power takeoff is cylindrical in shape and is secured to the transfer by six capscrews. A small pump (fig. 5-27), located on the exterior of the carrier (fig. 5-27), pumps lubricant from the transfer case into the power takeoff carrier; the lubricant then flows back into the transfer case through the input shaft or relief valve. The pump is driven by the power takeoff output shaft (fig. 5-27). The center of the output shaft contains a pump cam lobe (C, fig. 5-28) which raises and lowers the pump plunger (N, fig. 5-28) thus creating the suction that pulls the lubricant from the transfer case. There are two check valves (V, fig. 5-28) in the oil pump instead of one at the transfer case. The jaws of the clutch halves (A and P, fig. 5-28) are designed to provide highly efficient lubrication and drive in both directions of rotation. Shifting is accomplished by the shift lever (fig. 5-27) mounted on the side of the power takeoff carrier, which moves the shifter shaft (fig. 5-27) and shifter fork (B, fig. 5-28) back and forth to engage or disengaged the power takeoff sliding clutch (A, fig. 5- 28) from the transfer output shaft driving clutch (P, fig. 5-28). 5-24. Operation. NOTE The reference letters in parentheses pertain to figure 5-28. On trucks powered by gasoline engines, the speed at which the power takeoff operates is governed by the vehicle governor. The governor is attached to 5-16 the power takeoff by removing the governor plug (D) on the power takeoff and installing the vehicle governor drive assembly so as to engage the governor gear (E) of the power takeoff drive shaft (K). When the power takeoff exceeds a set limit of operation, the vehicle engine governor cuts in, governing the output speed of the power takeoff. On trucks powered by multifuel engines, speed regulation is maintained by throttle position, connected by Bowden wire from the PTO shift lever to the control lever on the injection pump. Normal operation of the governor section of the injection pump maintains the engine speed determined by this throttle setting. 5-25. Data. National stock number . . . . . . . . . . 2520-00-229-5673 Ordnance number . . . . . . . . . . . . . . . . . . . . . . 11609228 Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-136-C Speeds . . . . . . . . One (variable with engine rpm and transmission gear selection) Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer Output shaft . . . . . . . . . . . . . Tapered 1½ in. to 1 in. Bearing: Output shaft . . . . . . . . . . . . . . . . . . Two-roller type Horsepower delivered . . . . . . . Same as engine HP Figure 5-27. Power Takeoff Model P-136-C.