Zetor Silver Series

Engines

Since 1946, Zetor tractors have relied on Zetor's own engines. The “Silver” series tractors are equipped with the latest generation of Zetor engines. New engines bring more power, high torque, along with smooth run and  excellent cold weather starting. The large displacement of the new engines is based on proven higher-horsepower Forterra series engines, with horsepower reduced to meet the needs of mid-size tractors. This family of Zetor engines has become legendary during their 15 years of production for their reliability, extremely long life and easy servicing. The new engines are product of quality engineering and decades of Zetor engine design expertise. Using state-of-the-art engine technology, the new engines meet EPA Tier 3 emission regulations without affecting their highly regarded fuel economy. At the same time, our engines maintain proven all-mechanical controls, so future servicing is greatly minimized and simplified.

It does not get any easier: The new hood provides exceptionally good access for all service jobs.
The water pump has a special spool-type bearing designed for extremely long service-free life.
A dry air cleaner with main and safety elements is easy to service. Both elements are extra high capacity for extended service life.
The engine fuel filter, oil filter and oil fill plug and dipstick are centralized at one service-friendly location.
Heavy engine blocks ensure minimal sleeve distortion and long service life.

An air compressor is standard on all cab tractors and optional on open station models. You can use it to inflate tires, or to run various equipment. On cab models, the same air system also controls the rear differential lock and the mechanical front wheel drive clutch. An air system in these applications, unlike hydraulic systems, is simple and maintenance-free.

All Zetor tractors are equipped with a large all-copper radiator. New radiators are very efficient, and require less frequent cleaning. On tractors with air conditioning, the condenser slides to the side, to make cleaning easy.

 

 

 

Most Zetor tractors are used with front loaders.

Zetor engine clutch on tractor series 20/40 features 12" heavy-duty engine clutch plate with industrial-grade cerametallic lining, especially suitable for loader work. High mass flywheel dissipates heat efficiently. Engine clutch does not require any adjustment. Heavy-duty throwout bearings are designed for the life of the engine. The hydraulic clutch controls were redesigned for the new series. Special geometry of the clutch pedal considerably reduces pedal effort. Low pedal force allows for smooth and soft clutch engagement. The Power Plus Series is equipped with multi-plate wet clutch.

 

 

Zetor engines use precisely balanced components to ensure a smooth, vibration-free run. In addition, this Zetor engine family has traditionally been equipped with two precisionmachined balancer shafts running in needle bearings, further reducing engine vibrations at any engine speed.

Reliable Zetor in-line injection pump is superior to any rotary pump design and is designed for lifetime service-free operation. The in-line injection pump, together with high capacity battery (950 CCA) and efficient glow plug in each cylinder provide outstanding cold weather start. In-line Zetor pumps also tolerate fuel of various quality much better than other designs – great advantage for everyday farming environment. For almost 20 years, Zetor engines can be used with bio- diesel. Zetor injection pumps and turbochargers carry 5-year manufacturer’s warranty.

The side-mounted muffler is standard on all cab models. The operator’s view is not restricted. Open station tractors use horizontal exhaust.

New larger fuel tank with ground level fueling.

All Zetor engines have wet sleeves for easy and inexpensive overhauls.
No special tools are required for engine repairs.

Zetor engines are equipped with a glow plug in each cylinder, automatically controlled by the key switch. After a few seconds of preheating, the engine will start immediately, even on very cold winter days, without the help of a block heater. This system is far superior to other starting aids and is totally maintenance-free. For extremely cold climates, a block heater is available as optional equipment.

Transmission

 

The “20/40” series tractors come standard with smooth shifting fully synchronized mechanical shuttle transmission. It has 12 speeds forward and 12 reverse and improves the productivity of loader work dramatically. Optional high speed version of 4WD models is equipped with increased travel speed (24 mph top speed), to shorten travel times between work sites.

The “50” series tractors are equipped with 16/16 synchro-shuttle transmission with two-speed power shift and hydraulic PTO clutch.The “50 series Power Plus” tractors are equipped with 24/24 power shuttle transmission with three-speed power shift and hydraulic PTO clutch.

All gear shift levers are at optimized locations on the sides, leaving the floor clear and free of obstacles.

Control lever for power shuttle is located on the left side of the steering wheel.

 

 

 

 

A mechanical synchronized shuttle reverser is designed for loader work. Reverse speeds are slightly faster than forward speeds, for shorter cycles and better productivity. The smooth shifting shuttle shift lever is conveniently located on the left side of the steering wheel, leaving your right hand free to operate loader controls.

Push buttons integrated into the main gear shift knob on the “50” series tractors engage the two-speed powershift.









All models are available with all-new, heavyduty, center drive shaft, mechanical front wheel drive. Front axle load capacity has been further increased and is more than adequate for even the most demanding loader work. The drive shaft is fully shielded. The front drive axle with a very tight 55-degree turning angle provides turning radius comparable to 2WD tractors - a great advantage for loader work.
Powerful hydrostatic steering will easily handle even loader tractors. Rugged and practical front fenders are standard on most models and keep operator’s area clean.
New rear axle is now simpler and has increased load capacity.

 

Open station tractors also use a wide, comfortable platform, supported on special rubber blocks. The platform and the seat are five inches lower than on cab models. The roll bar can be folded in seconds.

Brakes

Wet disc brakes are highly efficient, yet engage very smoothly. They were designed for practically maintenance-free life. Due to the large number of plates (eight total) and their superb friction material, the brake wear is minimal. Brakes are cooled and lubricated by a continuous flow of the transmission & hydraulic oil. All brake controls such as cylinders are newly designed and externally mounted. The “40” series tractors with high speed transmission and all “50” series tractors are also equipped with wet front brakes integrated directly into the front final drives.

Power Take Off

The PTO on both “20/40” and “50” series is versatile and efficient. The difference between engine and PTO horsepower is kept to a minimum, typically 5-7%.

Independent PTO on “20/40” series tractors is operated by a separate mechanicalPTO clutch, fully independent from the engine clutch. This simple system engages smoothly and precisely and the operator is always in full control of PTO engagement.

The “50” series is equipped with wet PTO clutch operated by a push button on the right side of the cab. Independent PTO with both 540 and 1000 rpm speeds is standard, even on tractors with shuttle reverser. Again, a special cushioning valve in PTO hydraulic control system makes PTO engagement smooth and gradual.

All “Silver” series models also have standard ground speed PTO, which makes it possible to reverse the direction of PTO rotation (for example, to reverse the rotation of a post hole digger), a unique Zetor feature. The PTO can be run in reverse even while tractor is not moving. Ground speed PTO also makes it possible to run lowhorsepower implements, such as water pumps or generators, extremely efficiently. For example, you can run your PTO at 540 rpm while engine is at low idle.

Also available on all models: Front 3-point hitch with 3000 lb capacity and front PTO (1000 rpm, 50 HP max.). Front PTO and front 3-point hitch can be mounted separately, or combined. They can also be added later as dealer-installed accessory.

Cab

New Level of Comfort

Comfortable cabs and platforms have always been a Zetor tradition. The "Silver"series come with an updated, state-of-the-art design, more refined than ever.
The spacious cab has a level, uncluttered floor. Large window area provides excellent visibility in all directions. Fully upholstered fenders and thick floor insulation package keep heat and noice out.

Full instrumentation is weather-sealed and includes tachometer with hour meter, water temperature gauge, fuel gauge, air pressure gauge (cab models only) and a number of warning and indicator lamps for various functions.

The all-new, very wide and comfortable seat is standard in all cab tractors except models 7020 and 7040 and is packed with features. Seat swivels left and right for easier entry and exit. Swiveling also provides better position at the hydraulic controls. The seat is widely adjustable forwardbackwards, for operator's weight, in height, cushion angle, back rest angle, back rest lumbar support stiffness and shape. Arm rests and head rest are adjustable in heights. Standard horizontal isolator can be turned ON and OFF. Double-acting hydraulic shock absorber adds to operator’s comfort. Models 7020 and 7040 use a slightly smaller seat with three-way adjustment.

The cab contains standard tool box.

Front and rear wipers and windshield washer are standard. All windows are contoured for added strength and reduced noise and tinted to reduce heat and glare. Side windows can be latched in open position. The windshield has a roller sun blind. Cab models have six halogen front lights and four halogen rear work lights. Open station tractors have four front halogen lights and one rear halogen work light.
Wide, angled footsteps on both sides provide easy access to the tractor seat from either side.

Power socket, lighter, cup holder and storage compartment.

The high capacity, fast responding heater delivers warm air only a few minutes after a cold engine start. Efficient air conditioning is standard.

The tilt and telescoping steering wheel is standard on all models (except 7020 open station model) and is adjustable within a wide range, for better seating position and easier entry and exit.

Three-Point Hitch and Hydraulic System

Transmission oil fill and dipstick are at a service- friendly location. Zetor's heavy-duty 3-point hitch has very high lifting capacity (6,830 lb on most models). Such lifting capacity far exceeds most tractors of the same category. There is even an optional second booster cylinder available for all models, raising the lifting capacity to 9,000 lb. So, there is ample power to handle even the heaviest implements of the future. The hitch is adjustable to both Category I and II. The seat position and large window area ensure good visibility of the 3-point hitch and of the drawbar. Heavy-duty drawbar is standard on all models.

The newly designed live hydraulic pump with full-flow fine filter system has 14 gpm capacity.
A 17 gpm pump is optional on series “40”.
Unlike many competitors, all Zetors have a separate 6 gpm pump for steering, so all the oil supplied by the main hydraulic pump is constantly available for the 3-point hitch and the remotes (loader works at full speed all the time). The total hydraulic flow is 20gpm. All pumps are externally mounted for easy access.

The hydraulic levers offer finer control of the three-point hitch. Accurate and sensitive Draft and Mixed controls for plowing and other tillage operations are another traditional Zetor advantage, product of 40 years of development of Zetormatic hydraulic systems. Mixed control is a unique feature combining even plowing depth with high engine power utilization.

One set of remotes is standard on all open station tractors and also on cab tractor models 7020 and 7040. A direct return (zero pressure) coupler is also standard (required for hydraulic motors).

Telescopic lower link ends make implement hook-up easy.

Alternatively, lower links with quick-release hooks are available.

Additional 2nd & 3rd set of remotes is standard on most cab models and can be factory installed or field installed. On cab models, one spool is equipped with detented pressure positions with automatic release. Both spools have float. One of the ports is equipped with special check valve, which avoids any drift caused by oil otherwise leaking over long periods of time from cylinders back into the tractor. 2nd and 3rd set of remotes can also be installed on open station tractors. This set has float on one spool and is not using detented pressure positions.

New external three-point controls make implement hookup easy.

  Specification - Silver Series 20/40



  Specification - Silver Series 50