From horse-drawn to GPS-guided machine

Today a construction or agricultural machine is a concentrated clump of technology: diesel engine hydraulics electronics and satellite guidance in one. But the profession behind it — building operating and repairing machines that move earth and harvest crops — is only a little over a hundred years old as an independent craft. To understand what you work with it helps to know where it all came from.

§Before machines: muscle power and draft animals

For centuries, agriculture's most important 'engine' was people and animals. The field was ploughed with a wooden or iron plough drawn by oxen or horses, sown by hand and harvested with scythe and sickle. Threshing — separating grain from straw — was done with flail on the floor, hard and slow work that filled the whole winter. A single family could only cultivate the area their own hands and animals could reach.

Repairs were the village blacksmith's and wheelwright's work. The blacksmith made ploughshares, shod horses and bent metal at the forge; the wheelwright built cart wheels from wood. There was no 'machine mechanic' because there were no complex machines to repair. The craftsmanship you learn today grew as machines themselves were invented.

§The first machines: harvest machine and thresher

The first great leap came with machines that replaced manual labour in the most labour-intensive tasks. In Scotland, Andrew Meikle built a threshing machine with a rotating, toothed drum at the end of the 1700s — a machine that could thresh far faster than the flail. In 1831, the American Cyrus McCormick demonstrated his horse-drawn harvesting machine (reaper), which let one man harvest what five men previously managed with a sickle. These machines were still drawn by horses, but they marked the beginning of 'power farming', where mechanics replaced muscles.

§Steam cranes provide machine power for lifting at ports and factories

In the mid-1800s, steam power came to the fields. Large, heavy steam engines — traction engines — could drive threshing machines and pull ploughs. In practice, two steam engines were often used at opposite ends of the field, pulling the plough back and forth with a wire winch. It worked, but the steam engine was expensive, enormously heavy, slow to fire up and required both water and coal. For the ordinary farmer, it was too impractical. Steam power showed that machines could take over the hard work — but the right solution was still missing.

§The combustion engine and the modern tractor

The breakthrough came with the internal combustion engine. When Nikolaus Otto built his four-stroke engine in 1876 (patented 1877), a compact, portable power source became possible. Around 1900 the first gasoline and petroleum-powered tractors appeared, and the word 'tractor' itself came into use in the late 1890s, derived from 'traction engine'. Early tractors were still huge and only for large farms.

Two things made tractor everyone's possession. First assembly line production — Henry Ford's Fordson from around 1917 — made tractor cheap and light. Second International Harvester introduced in 1924 Farmall tractor a light versatile machine that could plow hoe and pull implements. Now ordinary farmer could replace his horses. With tractor arose real need for new kind tradesperson: machine mechanic who understood engines gears and later hydraulics

§The big shifts — a timeline

§Hydraulics and the three-point linkage — the quiet quantum leap

One of the most important but most overlooked advances became truly widespread after the war but the invention itself is older. The Irish inventor Harry Ferguson developed as early as the 1920s and 1930s a hydraulic three-point hitch that let the tractor lift and steer its implements with pressure — and automatically regulate ploughing depth. Together with a standardised power take-off (PTO) it meant that the same tractor could pull a host of different implements. That is the foundation for the hydraulics and power transmission you troubleshoot today and it explains why a modern tractor is so versatile.

§Electronics, environmental requirements and digitalization.

From the 1980s onwards electronics moved in. Sensors control units and data buses (CAN-bus) took over monitoring and regulation of engine transmission and implements. Stricter European emission requirements — the so-called Stage steps for non-road machines — forced emission cleaning such as particle filters and SCR/AdBlue onto even agricultural machinery. Today many machines are controlled by GPS and automatic steering that operates with centimetre accuracy and data is sent wirelessly home to the farm (telematics). The first electric and hybrid machines are on the way.

When you today stand with a machine that must plow with satellite guidance and live up to environmental requirements you're continuing a development that started with a plow in the field. Knowing the history makes clear why the trade is so broad — and why the basic principles of force movement and wear still apply regardless how advanced the machine becomes.