Module 16

- 2nd major component of a tractor
- provides draft power through the wheels
- rotary power through the PTO
- lifting power through hydraulic system

- the load is directly connected to the engine byb some kind of flange device
- transmission efficiency is about 100%
[ N1=N2]

- two pulleys are used and connected to each other by a belt
- transmission efficiency is less than 100% because of belt slippage
- clutch action may be obtained by a third party
- SR depends on the diameter ratio of the two pulleys
[N1D1=N2D2]

- two sprockets are used and connected by a roller chain
- transmission eff. is less than or equal to 100% because of the chain slack
- direction of rotation of the two sprockets are the same
- SR depends between engine and load depends on the number of teeth ratio of the two sprockets
[N1T1=N2T2]

- two meshed gears are used
- transmission efficiency is less than or equal to 100% because of gear slack
- direction of gears are opposite of each other
- center to center distance between the shafts of the gears is dictated by the size of the gears

the angular velocity between the gears of a gearset remains constant throughout the mesh

- any collection of two or more meshing gears

- at least one shaft carries more than one gear

- couplings which permit the disengagement of the coupled shafts during rotation

- start a smooth delivery of power to the transmission
- interrupt power while the transmission gear ratio is being changed
- interrupt power when the tractor is to be stopped

- mechanism used for stopping the vehicle

- special arrangement of gears so constructed and located in the transmission system that permist one driving wheel to rotate slower or faster than the other and at the same time propel its share of the load

device by which a restraining force is applied to the differential gears in case one of the wheels go into an idle spin, so that the differential yoke shafts are rotated as one unit

permits the drive wheels to run at much slower speed and with much higher torque than the earlier part of the drive train

- drive mechanism located in the front axle and can be engaged during conditions that require additional traction

- shaft located at the tractor's rear commonly used to drive rotary implements
- shaft must rotate clockwise as viewed from the tractor's rear

-enclosed system of assembled gears that transmits and distributes power from the engine to the different parts of the transmission system
- power from the engine can be modified by changing the speed and direction of rotation of the output shaft through the use of gears