Combines Flashcards
What basic functions are the same on both a conventional and a rotory combine?
Every function except for threshing and seperation are essentially the same on both the conventional and the rotory combine.
What are the seven basic functions of a combine?
1) cutting and feeding 2)Threshing 3)Seperation 4)Cleaning 5)Grain handling 6)Residue Management 7)Data collection.
What are the seven basic functions of a combine?
1) cutting and feeding 2)Threshing 3)Seperation 4)Cleaning 5)Grain handling 6)Residue Management 7)Data collection.
What basic functions are the same on both a conventional and a rotory combine?
Every function except for threshing and seperation are essentially the same on both the conventional and the rotory combine.
In which direction are feeder chains installed?
With the more aggressive side pulling crop into the combine.
at what capacity will a combine operate at its full efficiency?
When the combine is at full capacity it will operate at the highest efficiency.
how far off the ground should pickup header belts be positioned?
Approximately 1 inch.
The table of a header should be set how high off the ground and have what tilt?
The header table should be set about 14 inches from the ground and should be level.
operating a feeder chain too fast will have what effect on the feeding of the crop into the combine?
It will tend to pull the crop mat apart which will cause problems such as back feeding or will damage the crop.
What are the three adjustments that are made to a header auger to ensure it feeds crop into the combine optimally?
1)floor clearance 2)Stripper clearance 3)Finger timing
What should auger finger timing be adjusted to?
The fingers should be fully retracted at 3 0 clock and fully extended at 9 o clock
How should the reel finger timing be adjusted?
The fingers should be adjusted to enter the crop parrallell to the stem. Sweep back and leave the crop parralell.
What should the reel speed be set to for optimal performance?
Reel speed should be set to about 10 % above ground speed. This should provide slight seperation from the crop in front of it as it is fed into the header without causing damage to the head of the plant.
What are the two styles of rock traps found on modern combines?
mechanical beater style or electronic.
What is a ‘rock retarder drum’ referring to?
Some combines utilize a special front drum on the feeder house to inhibit rocks from entering the combine.
What is cracked or damaged grain reffered to as?
Dockage
how is the threshing element positioned in a conventional combine?
perpendicular to the body of the machine.
What can be said about the dimension of the feeder house on a conventional combine as compared to the dimesion of the rotor?
The dimension of the feeder house must be the same width as the dimension of the rotor to ensure proper crop flow through the threshing element.
Where are the two major threshing events in a conventional combine?
The initial impact of the rasp bar on the crop as it enters the threshing area and the compression and acceleration of the crop over the concave as it moves through the threshing area.
What two adjustments to a threshing element are crutial to ensure proper threshing?
Rotor speed and concave clearance.
What two functions does a concave perform?
Threshing and seperation
What is being reffered to with the term ‘pinch pont’?
The relationship between the cylinder and the concave not being completely parrallel. The concave clearance decreases as the crop is moved through the threshing element. This creates the so called pinch point which increases the compression on the crop and therefore allows for complete and effecient threshing.
What are the effects of setting concave clearance too tight?
Damage to the grain, increased horsepower, straw damage, increased wear of the concaves, and allow the combine to become plugged more easilly.
In terms of seperation what can the effect be of running the cylinder to slowly?
It can allow eccessive amounts of straw to fall into the cleaning system which will overload it and therefore allow it to end up in the grain tank with the cleaned grain.
