roro

-mechanical device powered by an engine ranging from 3hp to over 100 hp
-equipped with a transmission system
- equipped with a hydraulic system

-single axle machine powered by an engine ranging from 3-15hp
- walking type tractors

- provides pulling power through its drawbar
- fitted with pneumatic tires for dry land operation

- fitted with rotary blades to cut and pulverize the soil
- attached to the wheel axle for dry land operation

- fitted with a drawbar for traction work and a power-take-off (PTO) for rotary work
- comes with a moldboard or disc plow attached to the drawbar

-double axle machine powered by an engine ranging from 15hp to over 100 hp
- slow moving vehicle (up to 30kph) with high torque on the driving wheels
- with multiple speed transmission including reverse

- tractor with power rating below 32 hp

- tractors with power rating above 32 hp

- 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

- Structures made for attaching and for supporting implement
-hydraulically controlled in 4W tractors
- Dimensions, location are standardized
-drawbar and three-point hitches

force parallel to the direction of travel developed by the traction device and transferred to the vehicle

-aka true tire load
-load on the driving wheels during pull condition
-equal to the tractor weight (W) When the tractor is operating in four wheel drive

refers to the ratio of drawbar pullover the dynamic weight on the driving wheels

refers to the reduction in forward speed that occurs when a tractor pulls a drawbar load
- e.g. necessary in order for traction to be efficient

refers to the fraction of axle power that is converted to drawbar power by the drive wheels

material added to the tractor to improve traction and stability '

* lugged fires - to increase traction
* ribbed tires - suitable for steering
*lugs treads - should be oriented to penetrate the soil

- device used to convert electrical energy into mechanical energy
-efficient means of converting energy into mechanical energy compared to gasoline and diesel engines

the stationary component found in electric motors and generators
It consists of a laminated core and coils of insulated wire known as the windings

rotating part inside the stator that converts electrical energy into mechanical energy

select a motor whose torque output is always greater than the torque required by the load

determines the size and capacities of the electrical installations needed to operate the motor

-motors are built with four insulation classes that can withstand only certain amounts of operating temperature

motor is operated for more than 60 minutes without rest

operated only for a few minutes at a time with a rest or cooling period between operations

allows easy movement of air through the inside of the motor by providing slots or holes in the end shields or frame where the air can pass through

does not allow entry of air inside the motor

indicates the maximum load that can be safely carried by the motor under continuous operation

carries a good deal of essential information about the motor