1960, The first Unified Range Design by DmdB In 1957, a new philosophy was grown at Zetor Brno. In earlier ages, one could choose from three types of tractors, and about ten different breeds of horses and mules. But In the end of the fifties, horses were sold and replaced by tractors. It was the time that tractor dealers had close connections with butchers, to get rid of the traded in horses. The increasing mechanisation and motorisation of farms brought the demand for more, different, tractors.  To comply effective and easily to the demand, Zetor was in the year 1958 the first brand to introduce a system of unification. It meant a true revolution in production technology. It uses common parts, which are used to build up tractors of different sizes, powers and editions. The main advantage of this unification is the smaller number of parts, resulting in decreasing costs. The factory has to make less different parts, and the dealer doesn't need to have all of it in stock. It is also easier to carry through technical modifications, because you can update the whole unified range by adapting just a few manufacturing units. Meanwhile, more than a million tractors in this range are built. 1960: completing the Unified Range The 3011 was the first representative of the UR1. It's new direct injected three cylinder engine ran much smoother than the slow two cylinder of the 25. It performed 39 hp at 2200 rpm. This engine was built up from standardized sections. 2, 3 and 4 cylinder engines used the same parts, only the crankshaft, camshaft, fuel pump and cylinder block were different. The single cylinder heads, liners, pistons, valves, etc. were the same for all UR1 two, three and four cylinder engines. In 1962, the Zetor 4011 was introduced with a four cylinder engine at 53 hp. In 1963, a successor of the 25 A was introduced in this same line, as type 2011. These models were also the first with the Zetormatic hitch-hydraulic system, with full-position, draft, and mixed control. > The transmission was again a brand new design. The new 5 speed transmission had a dual clutch for independent PTO drive. A high and low gear range gave this transmission 10 speeds forward and 2 reverse. Five of the ten speeds were in the important field speed range of 4 to 12 km/h, what made this tractor a very strong competitor in its class. Zetor 2011 - 3011 - 4011 introduced at a farm fair These tractors had hydraulic operated drum brakes, combined with a belt-type parking brake. There was just one brake pedal, but a hydraulic selector valve made it possible to select left, right or both wheels, this system effected independent brakes. When brake pedal was released, the switch returned to neutral, so both wheels braked. The direct injected Diesel engines, very modern for that time, had a swirl chamber in the piston, and temperature adjustable fuel pumps. These novelties made these tractors gain popularity rapidly in any climatic zone around the world. The fuel injection pump, manufactured by Motorpal, had an adjustment device, to deal with the problem of increasing delay between fuel injection and self-ignition, in a coldstarting engine. Before you started the engine, you should press the 'cold start button' This made these engines start in practically all weather conditions. Other brands were messing around with fuel injection in the intake manifold, what could set your tractor on fire. The ten speed transmission made it, in combination with the Zetormatic weight transfer system, a very good transmission for field work. The Zetormatic has the abilities of full-position, draft and mixed control. The "weight transfer system" was intended to transfer weight from the plough to the rear axle of the tractor, to improve the traction. Together with a well-designed geometry of the hitch arms, it gave these tractors good performance in ploughing. The Ursus tractor factory from Poland stopped building their copies of Lanz hotbulb engines, and also started to build Zetor 4011 as Ursus C-4011. The communist governments decided to do so. The 2, 3 and 4 cylinder engines are still built under license by HMT in India. The trackwidths of these tractors were 135-150-165-180 cm, when each wheel is adjustable with steps of 7.5 cm. As with the 25, the 135 and 180 cm were for Central European potato row crop, with row widths of 60 to 65 cm, having two or three rows between the wheels. The 150 cm was for Western Europe where the maize and potato row crop distance is standardized on 75 cm. Specifications, special versions and options Zetor  UR1   0 series model  2011  3011 4011 production 1963 1967 1960 1967 1962 1967 type of engine 4 stroke OHV Diesel,  liquid cooled, D.I. No. of cylinders 2 3 4 bore x stroke (mm) 95 x 110 95 x 110 95 x 110 displacement (CC) 1.559 2.339 3.118 Power HP 25 39 53 at rpm 2000 transmission speeds 1 L  (km/h)  2 L  3 L  4 L  5 L  rev. L  1 H  2 H  3 H  4 H  5 H  rev. H  1.11 1.61 2.21 3.53 5.71 (1.58) 4.6 6.6 8.9 14.5 23.5 (6.5) 1.12 1.66 2.31 3.55 5.93 (1.46) 4.77 7.1 9.9 15.2 25.4 (6.24) 1.13 1.67 2.34 3.59 5.99 (1.47) 4.82 7.17 10 15.34 25.6 (6.29) PTO indep.540 rpm/ground optional belt pulley 5 speeds: 2.83 - 15.1 m/sec. hydraulics Zetormatic control Position/power/mixed pressure (bar) 120 140 160 remote outlet (scv) 1 valve, 2 lines Tires         front  rear  5.50-16 10-28 6.00-16 11-28 6.00-20 13-28 trackwidth  (mm) 1275-1800 1275-1800 1350-1800 wheelbase  (mm) 1745 1918 2125 weight(kg) 1300 1480 1965 Other versions were: 2013 and 3013 narrow vineyard and orchard tractors with more narrow rear final drive, and narrow front axle. 3017 with lowered center of gravity, this was gained by turning the final drives of the portal axle more rearwards. Because of its low overall height, this tractor was also used for use under trees, in fruit gardens. options were: * cab with heater * Air brakes * front mudguards * belt pulley * front weights * wheel weights * Tropics cooling system * double rear wheels 3016 - 4016 the halftrack version, for use in snow and weak soil, forest and on hills   2023 tracked narrow version for vineyards and hop gardens. could climb steep hills. 3045 - 4045 FWD version. The front wheels were only driven in the high gear range. (the 4045 was never serial produced)   3011 with optional cab           1968: better, stronger and heavier In 1966, production of Zetor 5511 started, as a stronger and more powerful model above the 4011. It had a reinforced front axle made from 'U'-profile, double brake pedals for the independent brakes, a new dashboard, and a powered clutch. In 1968, positive reactions of customers on the "Brussels Conference" with all Western European Zetor dealers, made the engineers to decide to update the old 0 series to the new 5 series, sharing the modern look of the square nose, the cast-iron front and front axle of the 5511. Also options like power steering, the new air suspended "Aerolastik" drivers seat and 540/1000 PTO came available on the smaller tractors. The most significant new option was the ROPS safety cab. Versions with this early wide cab were named, for example, 5611 instead of 5511. The new cab had a high level of integration into the tractor design, the cab with mudguards was mounted on rubber blocks. The dashboard and steering house were still mounted on the tractor frame. The reinforced front axle made from a 'U'-profile, together with a stronger pivot and new cast-iron front made the tractor stronger, for front loader use. The extra weight on the front made it more stabile with heavy hitch implements. The heaviest types 4511 and 5511 had standard a coil spung frontaxle. Special versions   The 2511 was the last two cylinder engine manufactured in Brno, which was produced to 1977 complementary to the modernised 7 series, 4712 to 6748.   Zetor  UR1   5  series model 2511 3511 4511 5511 production 68'-77' 68'-72' 68'-72' 66'-72' type of engine 4 stroke OHV Diesel, liquid cooled, D.I. No. of cylinders 2 3 4 bore x stroke (mm) 95 x 110 displacement (CC) 1.559 2.339 3.118 3.118 Power  HP 25 39 53 60 at rpm 2000 2200 transmission speeds 1 L  (km/h)  2 L  3 L  4 L  5 L  Rev.  1 H  2 H  3 H  4 H  5 H  Rev. 1.7 2.3 4.3 5.2 7.7 ? 6.5 8.5 12 18 30 ? PTO indep. 540 rpm/ground/ opt. 1000 hydraulics Zetormatic control Position/draft/mixed hitch lifting force (kg) 800 1000 1400 1630 remote outlet (scv) 1 valve, 2 lines Tires        front 2wd front 4wd rear  6.00-16 - 11.2-28 6.00-16 9.5-24 12.4-28 6.00-16 - 14.9-28 6.00-20 11.2-24 14.9-28 trackwidth  (cm) 135-180 wheelbase  (cm) 1750 1920 2130 2260 weight (kg) 1340 1520 2100 2440 Zetormatic hydraulics Weight transfer system: transfers weight of the implement to the rear axle of the tractor. Advantages are less wheel slip with a lighter tractor, no hard subsoil layers are formed by the bottom of the ploughshares, less fuel consumption.  © DmdB 2001-2002