Cultivation machinery

TEXT A

CULTIVATION MACHINERY

LESSON 3

TEST QUESTIONS

NOTES

AND HYDRAULIC SYSTEM

The starter is used to rotate the crankshaft of the engine during the start. Faults may be the following: fractures in the starter body, the damage to the insulation, short-circuit of the starter armature and the covers from the collector side and the drive side, the wear of the bearing boxes, bearings and the clutch, etc.

To eliminate¹ all these faults do the following:

1. Replace the damaged insulation.

2. Change the worn bearings, bearing boxes, bolts and the lubrication of the clutch.

3. Regulate and test the starter and its voltage.

During the use of the gearbox shafts, gears, gearbox bodies, rods are worn out. Some faults are eliminated without removing the gearbox. But there are some other faults, which occur because of the wear of bearings, gears, overheating. In these cases it is necessary to replace the parts. Wear of the rear axle, gears is possible in track laying tractors. Wear of the differential shafts, covers, gears and so on occurs in wheeled tractors.

The hydraulic system also can have some faults: wear of the walls and the bottom of the gear pump, gears and surfaces, fractures in the distributor, wear of the cylinder; damage to the locking device, problems with the tightness² of valves and hoses³. Remove the damaged parts and repair them.

¹to eliminate - устранить

²tightness - герметичность

³hose - шланг

1. What is the main function of a tractor?

2. How can tractors be classified?

3. What farm jobs can tractors perform?

4. What are the certain features of modern tractor?

5. What farm implements can a tractor operate with?

6. What is a frame used for?

7. What can you say about the power unit?

8. What are the main parts of the transmission system?

9. What must the driver do to reach the highest efficiency of tractor operation?

10. Why is it necessary to check all tractor systems before use?

11. What faults can be detected?

12. How must the main tractor mechanisms operate?

13. What generators are used in tractors?

14. What should you do in case of generator fault?

15. What can you detect in case of relay-regulator fault?

16. What role does the starter perform?

17. How can we repair the starter?

18. What causes faults in the gearbox and in the rear axle?

19. What are the hydraulic system faults?

20. Why must engineers and designers construct new models of tractors?

TEXT A CULTIVATION MACHINERY

TEXT B MODERN PLOWS

TEXT C SERVICE AND MAINTENANCE OF CULTIVATION MACHINERY

GRAMMAR REVISION PERFECT TENSES, TO HAVE

Seedbed preparation is the most important farm operation. Many kinds of farm implements are used to break, turn, pulverize, loosen, and aerate the soil and prepare it for drilling and planting crops.

Primary tillage equipment includes various types of plows. Deciding which of them to use, depends on climate and soil conditions. One can use mould board plows, disk plows or subsoil plows.

Secondary tillage equipment includes harrows, rollers and cultivators.

Mould board plows may be of different types according to the kind and number of mould boards, type of soil and the tractor size. There are conventional plows with right-handed¹ mould boards and reversible plows having both left- and right-handed mould boards.

Disk plows are the best ones for cutting virgin², dry, and root lands. Subsoil plows are employed to loosen the soil in the bottom of the furrow made by the ordinary plow.

After the soil has been plowed, different types of harrows are used. They finish the seedbed, cover the moisture, destroy weeds, aerate the soil, break the clods, etc. There are harrows with zigzag frame and rigid of flexible spring tines. The tines may be of reciprocating or rotating types. On disk harrows 2 or more sets of disks are fitted on a frame. They cut stubble or trash, and harrow hard and sod soils. Light harrows are mounted on small tractors and are used for covering seeds after drilling. Medium³ harrows are also mounted or semi-mounted. They mix fertilizers with soil, cultivate autumn-sown⁴ corn, etc. Heavy rotary harrows make good seedbeds in spring after the soil has been frosted. Drag harrows both loosen and level the soil. They are driven from the PTO-shaft and depth control is provided by the hydraulic system.

Various kinds of rollers are used to compact the soil before and after drilling, to loosen the upper⁵ level and to firm the surface level of soil, to break clods and to smooth the soil.

Cultivators are used for stubble cleaning and breaking, seedbed preparation usually for root-crops, cutting weeds, interrow cultivation⁶, for land reclamation work, etc. Cultivators may be mounted or trailed. Rotary cultivators have a PTO-shaft to perform different jobs.

Cultivators have removable working parts. They have tines to loosen the soil and to destroy weeds, shares to loosen the soil more deeply, blades to apply fertilizers, and bodies to earth up crops.

All cultivation machinery needs regular maintenance in order to ensure⁷ long working life.

Дата добавления: 2014-10-17