Figure 13-15.-Single-speed, single-gear, power takeoff.of mesh with the countershaft gear. The spring-loaded ball holds the shifter shaft in position.On some vehicles you will find power take-offunits with gear arrangements that will give twospeeds forward and one in reverse. Several forwardspeeds and a reverse gear arrangement are usuallyprovided in power take-off units that operate winchesand hoists. Their operation is about the same as thatin the single-speed units.PROPELLER SHAFT ASSEMBLIESThe propeller shaft assembly consists of apropeller shaft, a slip joint, and one or more universaljoints. This assembly provides a flexible connectionthrough which power is transmitted from thetransmission to the live axle.The propeller shaft may be solid or tubular. Asolid shaft is stronger than a hollow or tubular shaftof the same diameter, but a hollow shaft is strongerthan a solid shaft of the same weight. Solid shafts areused inside a shaft housing that encloses the entirepropeller shaft assembly. These are called torque tubedrives.A slip joint is put at one end of the propellershaft to take care of end play. The driving axle,attached to the springs, is free to move up and down,while the transmission is attached to the frame andcannot move. Any13-13
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