Introduction
Zetor 25A Standard-Tread Tractor
The Zetor 25A is a standard-tread agricultural tractor produced in Brno, Czechoslovakia, between 1949 and 1961. With 158,570 units manufactured, this two-wheel drive machine represents a significant model in the mid-20th century agricultural landscape, designed for versatility and durability.
Engine and Performance
The tractor is powered by a 2-cylinder, liquid-cooled diesel engine with a displacement of 126.8 cubic inches (2.1 liters). It features a bore and stroke of 4.134 by 4.724 inches and a compression ratio of 18:1. The engine provides 25 horsepower (18.6 kW) at a rated speed of 1800 RPM. Starting is facilitated by a 3.0 kW, 12-volt starter motor.
Transmission and PTO
The drivetrain utilizes a gear-type transmission providing 6 forward speeds and 2 reverse speeds, connected to the engine via a dry disc clutch. The rear power take-off (PTO) is a live system operating at 540 RPM, achieving this speed at an engine setting of 1600 RPM.
Dimensions and Chassis
The Zetor 25A has a wheelbase of 74.8 inches and an overall length of 126 inches. The chassis features an adjustable front and rear tread, ranging from 47.2 to 59.1 inches, allowing for adaptation to different row crops. The front axle offers a ground clearance of 16.5 inches. The machine weighs 4,026 lbs and is equipped with 5.50-16 front tires and 11.25-24 rear agricultural tires.
Electrical System
The electrical system operates on 12 volts with a negative ground configuration. Power is supplied by a 150 AH battery and maintained by a generator capable of 12.5 amps of charging current.
Conclusion
The Zetor 25A is a utilitarian, two-wheel-drive tractor characterized by its simple mechanical design and adjustable tread width. Its configuration makes it suitable for general field operations and light-to-medium traction tasks, reflecting the standard agricultural requirements of its production era.
Production Information of Zetor, 25A
- Standard-tread tractor
- Built in Brno, Czechoslovakia
| Manufacturer | Zetor |
|---|---|
| Total built | 158,570 |
Dimension and Tires Information of Zetor, 25A
| Wheelbase | 74.8 inches [189 cm] |
|---|---|
| Front tread | 47.2 to 59.1 inches [119 to 150 cm] |
| Clearance (front axle) | 16.5 inches [41 cm] |
| Length | 126 inches [320 cm] |
| Rear tread | 47.2 to 59.1 inches [119 to 150 cm] |
| Weight | 4026 lbs [1826 kg] |
| Ag front | 5.50-16 |
|---|---|
| Ag rear | 11.25-24 |
Engine Specifications of Zetor, 25A
- Zetor
- Liquid-cooled
- Diesel
- 2-cylinder
| Starter power | 4 hp [3.0 kW] |
|---|---|
| Displacement | 126.8 ci [2.1 L] |
| Compression | 18:1 |
| Bore/Stroke | 4.134x4.724 inches [105 x 120 mm] |
| Starter volts | 12 |
| Rated RPM | 1800 |
| Power | 25 hp [18.6 kW] |
Transmission Information of Zetor, 25A
Transmission variants 1
| Type | Gear |
|---|---|
| Gears | 6 forward and 2 reverse |
| Clutch | Dry disc |
Mechanical Specs of Zetor, 25A
- Two-wheel drive
- Open operator station.
Power Information of Zetor, 25A
| Rear PTO | Live |
|---|---|
| Rear PTO Type | 540 |
| Engine RPM | 535@1600 |
Electrical System of Zetor, 25A
| Ground | Negative |
|---|---|
| Battery AH | 150 |
| Battery volts | 12 |
| Charging system | Generator |
| Charging amps | 12.5 |
Where it sits
With 25 HP, the Zetor 25A sits between Compax 25 (23 HP) and 2520 (27 HP) in Zetor's range. Its power puts it in the 30th percentile of 1940s models in our database (263 machines).
Frequently asked questions
How much horsepower does the Zetor 25A have?
The Zetor 25A delivers 25 HP.
What years was the Zetor 25A produced?
The Zetor 25A was produced in 1949-1961.
What engine does the Zetor 25A have?
The Zetor 25A is powered by a Diesel, 2-cylinder engine.
What transmission does the Zetor 25A use?
The Zetor 25A uses a Gear transmission.
How much does the Zetor 25A weigh?
The Zetor 25A weighs 4026 lbs [1826 kg].
Is the Zetor 25A 4WD?
The Zetor 25A is available in 2WD.