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Auxiliary Transmission
Final Drives - 14081_60

Equipment Operator Basic - Beginning construction equipment operators manual
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However,  if  the  rear  wheels  should  lose  traction  and  begin to slip, they tend to turn faster than the front wheels. When this occurs, the sprag unit automatically engages. This action allows the front wheels to also drive the vehicle. The sprag unit simply provides an automatic means of engaging the front wheels in drive for more traction. Power Takeoffs Power takeoffs, commonly known as the PTO, are attachments in the power train for power to drive auxiliary accessories. They are attached to the transmission, auxiliary transmission, or transfer case. A common type of PTO is the single-gear, single-speed type that is bolted to an opening provided in the side of the transmission case, as shown in figure 2-10. The sliding gear of the PTO meshes  with  the  transmission  countershaft  gear.  The operator can move a shifter shaft control lever to slide the gear in and out of mesh with the countershaft gear. The spring-loaded ball holds the shifter shaft in position. On  some  vehicles,  PTO  units  have  gear arrangements that give two speeds forward and one in reverse. Several  forward  speeds  and  reverse  gear arrangements are usually provided in PTO units used to operate  winches  and  hoists. PROPELLER SHAFT ASSEMBLIES The propeller shaft assembly (fig. 2-12) consists of a propeller shaft, commonly know as the drive shaft, a slip  joint,  and  two  or  more  universal  joints.  This assembly  provides  a  path  through  which  power  is transmitted from the transmission to the drive axle assemblies or auxiliary equipment. Vehicles, having a long wheel base, are equipped with a propeller shaft that extends from the transmission or transfer case to a center support bearing and a propeller shaft that extends from the center support bearing to the rear axle (fig. 2-13). Figure 2-12.—Propeller shaft assembly. Figure 2-13.—Propeller shaft assembly with center support bearing. 2-9







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