The document discusses combine harvesters, which are self-propelled machines that can reap, feed, thresh, separate, and clean grain in a single operation. It describes the various components of a combine harvester like the reel, cutter bar, cylinder, concave, and cleaning components. The document also outlines the mechanisms involved in cutting, feeding, threshing, separating, and cleaning the grain and lists specifications for a full feed tank type harvester. Potential grain losses at each stage and how to make adjustments to reduce losses are described. Advantages of the machine in saving time and labor during harvesting are highlighted, along with disadvantages related to costs and transportation.

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COMBINE
HARVESTER
Combine Harvester is a self-propelled
machine that accomplishes reaping,
feeding, threshing, separating, and
cleaning of grain effectively in a single
operation.
The mechanization of grain harvesting has been a longtime
objective of farmers. Combines are used in the harvesting and
cleaning of cereals such as wheat, barley, corn, oats, rice, rye,
and sorghum, as well as several non-grain crops, including flax,
rapeseed, soybeans, and sunflower seeds.

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CLASSIFICATION
Combine
Harvester
Transpor
t
Power
Operatio
n
Grain
Storage
Half
Feed
Full
Feed
Tank
type
Bag
Type
Wheel
Type
Crawl
er
Type
Self-
Prope
lled
PTO
EXAMPLE OF COMBINE HARVESTER AVAILABLE IN BANGLADESH
1. Yanmar Combine Harvester Tank Type Smart Assist Remote
(SAR)
2. Yanmar Combine Harvester Bag Type Smart Assist Remote
(SAR)
3. ACI Combine Harvester HF-2 Tank Type
4. Liulin Combine Harvester
5. FM World DR 105a 90HP Tractor mounted combine harvester
6. FM World 102HP Combine harvester

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1. Reel
2. Cutter Bar
3. Feeding Conveyor
4. Head auger
5. Cylinder
6. Concave
7. Beater
8. Grain pan
9. Fan
10. Wind vane
11. Clean grain auger
12. Chaffer
13. Tailing’s auger
14. Shoe sieves
15. Chaffer
extension
16. Straw chopper
17. Straw walker
18. Retarder flap
19. Unloading auger
20. Grain tank
21. Distribution
auger
22. Clean grain
elevator
MAJOR
COMPONENTS
FULL FEED TANK TYPE GRAIN COMBINE
HARVESTER

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Mechanisms
Threshin
g
3
Feedin
g
2
Cuttin
g
1
Reel
Cutter
Bar
 Feeding
Convey
or
 Head
Auger
 Cylind
er
 Concav
e
Separatin
g
4
 Straw
walker
 Beater
 Straw
rack
 Grain
Pan
Cleanin
g
5
 Fan
 Straw
Chopp
er
 Wind
Vane

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FSEE
SPECIFICATIO
NS
FULL
FEED
TANK
TYPE
GRAIN
COMBINE
HARVESTER

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1. Shatter loss
Grain lying on the ground or out of reach of the cutter bar
2. Cutter bar loss
Grain lost out the rear of the combine in the form of
unthreshed heads
3. Threshing loss
Grain lost out the rear of the combine in the form of
unthreshed grain
4. Separating loss
grain lost out the rear of the combine in the form of threshed
grain
5. Cleaning loss
Loss in value of the crop due to the presence of foreign
matter in the grain
LOSSES

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Shatter loss is not the responsibility of the machine
Cutter bar loss may be reduced by
 By adjusting the cutter bar height controller
 Bay adjusting the horizontal distance between the reel and
the cutter bar
 By sharpening the knife of the cutter bar
Cylinder losses may be reduced by
 By adjusting the concave clearance
 By adjusting the cylinder speed
 By adjusting the forward speed of the combine
Separating loss: Rake and Shoe losses may be reduced by
I. Rake loss
 By adjusting the forward speed of the combine
 By raising the cutter bar
I. Shoe loss
 By reducing the forward speed of the combine
Cleaning losses may be reduced by
 By closing down the shoe sieve and/or the chaffer sieve
Adjustment

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 It saves time and labor.
 It can perform harvesting on a large scale.
 It can simultaneously separate the grains from the straws.
 The most basic disadvantage lies in its cost. Due to this
very reason, it has become problematic for the farmers as
for them it appears to be too much for one farm to buy
and keep solely to themselves for their own use.
 The second disadvantage lies in its size. Due to this reason,
they are difficult to transport on a low loader to distant
farms.
 They are impotent of using in small areas and unfit for any
indoor use. They are best used in large and open fields.
ADVANTAGES OF COMBINE
HARVESTER
DISADVANTAGES OF COMBINE
HARVESTER

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QUESTIONS
GROUP: FSEE

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Thanks for
Listening with
great patience
Group: FSEE