John Deere 4020-5020

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From the large American models, the 4020 was also manufactured in Germany starting in 1969. In the USA, it had been introduced as the successor to the earlier 4010 in 1964. The 4-speed Power Shift transmission was new technology at the time. However, the basic transmission was an 8+2 Syncro-Range. The differential lock was operated hydraulically with a foot pedal. Nearly all other controls, including those for the hydraulics, were consolidated in the dashboard. The European version had a lifting capacity of 2700 kg instead of the American model's 1800 kg. The hydraulic pump was an adjustable displacement pump. The draft sensing was done via the draft arms. The steering was hydrostatic, and the oil-immersed disc brakes were hydraulically operated. The 4020 was the best-selling tractor in the USA during the 1960s. Unlike many other American tractors, sales focused on the diesel model, although gasoline and propane versions were of course available. The 4020 also has a reputation as an exceptionally durable tractor. Hydrostatic four-wheel drive became available in 1969.

Between 1969 and 1972, a budget model 4000 was sold, which offered "the most horsepower per dollar." It was essentially a simplified 4010 fitted with the engine from the 4020. The transmission was 8+2 without a synchronized reverse gear, and the lifting mechanism was of lighter construction.

The 4520, introduced in 1968, was one of the first turbocharged tractors and was larger and more robust in every way than the 4020. Even more massive was the 5020, equipped with an 8.7-liter engine. Its hydraulic output was among the largest on the market. The 24-volt electrical system was implemented using four 6-volt batteries. In 1970, a 117-horsepower turbocharged 4320 was introduced, and in 1971, the most powerful 6.6-liter, that is 135-horsepower, 4620 with an intercooler was launched. The 4620 was also available with hydrostatic four-wheel drive. From 1971 onward, air conditioning was available as an optional feature in the cab.

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