zetor tractor history guide from 1946 to 1987

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A three cylinder tractor also appeared in this era. The engine was a combination of one and a half T25 engines. It's power was 29 hp at 1400 rpm.

Specifications of the Zetor T series

model

15

25/25 A

25 K

production

1947-1949

1946-1948/ 1961

1948-1961

type of engine

4 stroke OHV, indirect injected Diesel, water cooled

No. of cylinders

1

2

ZETOR came with their first four cylinder tractor in 1955, called the Super 35. Its engine was a direct clone of the one of the 25, and was used in the models 35 super, and Super P. The updated Super 35 was called Super 50, introduced in 1960. It had a power output of 50 hp, also at 1500 rpm. The transmission was in the same style as the one of the model 15, the place of the belt pulley, and the number and gear ratios were similar. The 5 speed had a solid and simple construction. The Super series had also some nice standard features, such as an independently leaf sprung front axle, differential lock, air compressor, and an engine oil cooler. This cooler was an advantage for stationary work, such as driving a threshing machine on the belt pulley. Optional was a drivers cab with heater.

the Super P
The 42 hp engine was also used in a tracked tractor, the Super P. Its weight was 4200 kg, what means a specific weight of 100 kg per HP. The transmission had other gear ratios than the wheeled super, it was made for heavy haulage at between 3 and 7 km per hour. Its maximum speed was 15 kph. The folder speaks of a fuel use of 17.5 litre per Hectare, or 9 litre of Diesel per hour at a ploughing depth of 30 cm. The demand for tracked tractors in the fifties consisted from the lack of hitch-hydraulic weight transfer systems and the slow development of good tractor tires. A winch was an option when it was used in forestry to haul trees trough the woods.The agricultural versions had standard a hydraulic hitch. It was also used with optional dozer blade for landscaping and earthmoving, and for the deep tillage what land reclaim projects demanded.

"Tough guy..."

specifications of the Zetor Super
model production type of engine No. of cylinders bore x stroke (mm) displacement (CC) Power HP at rpm transmission speeds 1 (km/h) 2 3 4 5 R PTO belt pulley hydraulic hitch trackwidth Tires weight (kg)
front rear

35 Super 1955-1960

50 Super 1960-1968

Super P 1956-1958

4 stroke OHV Diesel, indirect injected, water cooled 4 105 x 120 4,156 42 3.92 5.15 7.42 12 24 ? dependent 540 rpm yes yes 120-150 6.00 x 20 13 x 28 2550 173 tracks 4200 50 1500 2.4 3.14 4.5 7.3 14.6 2.4 42

A local agricultural contractor had two Zetor 50 Supers in the fifties. These tractors left quite an impression on the people of that time. My neighbour remembers them as "two of those real huge Zetors pulling the manure spreaders" These tractors were extremely tough pullers, because of the low engine speed and big displacement. Only the real hog could wreck these solid machines without a sledge hammer. The Supers are built from 1955. The Super 35 was succeeded in 1960 by the Super 50, which was produced to 1968. It was sold as affordable alternative for the UR 1 type 4011, which was more productive and economic in use. From 1955 to 1968, 106.881 tractors were made in the Super series.