1. Describe the picture:

Fig. 1 1. engine; 2. front sub frame; 3. front driving wheels; 4. cab; 5. fuel tank; 6. rear sub frame; 7. rear driving wheels; 8. hitch.

2. Find 10 adjectives and form three degrees of comparison.

Text 5 The Rotacon 7500

Learn the words.

adjustable -регулируемый

hydraulic -гидравлический

pump –насос

The Rotacon 7500

1. The Rotacon 7500 rake is claimed to be a new concept in swath preparation. It differs from conventional rotary wind-rowers in that it is not fixed in the width of the grass that it can gather or the swath that is left.

2. The machine consists of a v-shaped adjustable frame with each arm comprising a rotor housing and two hydraulically driven rubber tine-holders.

In operation, each of the four tine-holders or rotors is driven by its own hydraulic motor that is powered by an on-board hydraulic pump operated from the tractor pto.

3. These hydraulic motors are connected to the same circuit as the hydraulic wheel cylinders that raise and lower the machine.

When the rotors are in the working position, the extra torque required to rotate any or all of them creates an increased pressure at the motor that in turn increases the pressure at the wheel cylinders.

4. Both swath and operating widths are adjustable by altering three chains at the rear of the machine.

5. The two arms open hydraulically and are maintained in the working position by a check valve located in the folding ram that is operated direct from the tractor.

The tines are easily replaced. The cost is S20,000.

EXERCISES

1. Find in the text English equivalents for the following Russian words and phrases:

Гидравлический мотор, ширина захвата, рабочая позиция, v-образная рама, зубцы.

2. For this as you read the text choose from the heading (a-f) below the most suitable for each part (1-5). There is one extra heading which you do not need to use.

A. The same hydraulic circuit of cylinders and motors

B. A new concept in swath preparation

C. Maintaining machine in the working position

D.The changing of operating width

E. The driving gear of the machine

F. Conventional steering

Text 6 Tillage and Tillage Implements

Learn the words.

retard weed growth – замедление роста сорняков

two-way plows – двусторонние плуги

tractor-mounted and tractor-drawn – навесная и тракторная тяга

an adjustable hitch – регулируемое устройство

to prevent – предотвращать

the hitch – устройство

strikes an obstacle – ударопрепятствие

a lifting mechanism – подъёмный механизм

to adjust – регулировать

a lever – рычаг

secondary tillage – вторичная обработка почвы

disc harrow – дисковая борона

spike-tooth harrow – шипованная борона

spring-tooth harrow – пружинная борона

row-crop cultivators – пропашные культиваторы

Tillage and Tillage Implements

As you know tillage is used to prepare the ground for seeding or planting, to retard weed growth and to improve the physical condition of soil. Tillage includes various operations: plowing (primary tillage), harrowing (secondary tillage), deep tillage, cultivation, fertilizing, etc.

Primary tillage, or plowing, may be done by various kinds of plows, such as two-way plows, disk plows, rotary plows, etc. The plows may be both tractor-mounted and tractor-drawn.

Tractor-drawn plows are attached to the tractor by an adjustable hitch which permits horizontal adjustment of the plow and prevents "nosing" of plow points. The hitch incorporates a spring release or some other device which disconnects the plow when it strikes an obstacle. In some plows each bottom is held in working position by a heavy spring which permits the bottom to raise and pass over the obstacle. Tractor-drawn plows are provided with a lifting mechanism which raises them from or lowers them to their working position. The lifting mechanism may be either mechanical or hydraulic. There are also1 two levers —one for regulating the depth of plowing, the other for levelling the plow.

A tractor-mounted plow is a compact unit of high maneuverability which is adjusted by means of hydraulic

Controls. Due to hydraulic controls the tractor operator can quickly connect and disconnect the implements without leaving the cabin. Tractor-mounted plows, like tractor-drawn plows, have two levers — one is used for regulating the depth, the other — for levelling the plow.

Secondary tillage, or harrowing, is done to refine the ground after plowing. Depending on the physical condition of soil 2 and other factors various kinds of harrows must be used, such as, disc harrow, spike-tooth harrow, spring-tooth harrow, etc.

It goes without saying3 that all types of harrows, like plows, are either tractor-mounted or tractor-drawn.

There are other implements ' intended for retarding weed growth, such as row-crop cultivators, field cultivators, spring-tooth weeders, etc.