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140122 ||| eng |
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|a 9781468466324
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| 100 |
1 |
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|a Smith, D.
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| 245 |
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|a Tractors and their Power Units
|h Elektronische Ressource
|c by D. Smith
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| 250 |
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|a 1st ed. 1989
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| 260 |
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|a New York, NY
|b Springer US
|c 1989, 1989
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| 300 |
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|a XVI, 464 p
|b online resource
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| 505 |
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|a 1 Development of the Tractor -- 2 Thermodynamic Principles of Internal-Combustion Engines -- 3 Internal-Combustion Engine Cycles -- 4 Fuels and Combustion -- 5 Engine Design -- 6 Electrical Systems -- 7 Engine Accessories -- 8 Lubrication -- 9 Human Factors in Tractor Design -- 10 Traction -- 11 Mechanics of the Tractor Chassis -- 12 Hydraulic Systems and Controls -- 13 Transmissions and Drive Trains -- 14 Tractor Tests and Performance -- Appendixes -- A Standards for Agricultural Tractors -- B Standard Graphical Symbols -- C Agricultural Tractor Tire Loadings, Torque Factors, and Inflation Pressures—SAE J709d -- D Conversion Factors
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| 653 |
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|a Humanities and Social Sciences
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| 653 |
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|a Humanities
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| 653 |
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|a Social sciences
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| 041 |
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|a eng
|2 ISO 639-2
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| 989 |
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|b SBA
|a Springer Book Archives -2004
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| 028 |
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|a 10.1007/978-1-4684-6632-4
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| 856 |
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|u https://doi.org/10.1007/978-1-4684-6632-4?nosfx=y
|x Verlag
|3 Volltext
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|a 001.3
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|a 300
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| 520 |
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|a At the time of the writing of the fourth edirion of this textbook, the agricultural economy in the United States and Canada was depressed. The prices paid to farmers for their grain crops were very low, and consequently most farmers in North America could not afford to buy a new tractor when needed; there fore, the sales of tractors and other farm machines were much below normal. The farmer who was the victim of the depressed economy was forced to "make do." Instead of purchasing a new tractor when the old one needed to be replaced, the farmer usually purchased a used or second-hand tractor or repaired the old one. In a strict sense, tractors usually do not wear out; instead, they become obsolete. The farmer who owns an obsolete tractor would prefer to replace it with one having more power, more speeds, more conveniences, a better hydraulic system, lower operating cost, or all of the above. But farmers in the United States, Canada, and other industrial nations will continue to want to purchase tractors that have all of the features, in cluding microprocessors, found on other vehicles
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