Overview
The Zetor 25A is a standard-tread farm tractor produced in Brno, Czechoslovakia, between 1949 and 1961, with a total production run of 158,570 units. It is powered by a 2.1L 2-cylinder diesel engine rated at 25 hp and features an open operator station with a two-wheel drive system. The tractor is configured with a 6-speed gear transmission and a live rear PTO system.
Ideal Applications
Powertrain and Electrical Configuration:
The 126.8 ci diesel engine operates with an 18:1 compression ratio and is supported by a 12V electrical system featuring a 150 AH battery and a 4 hp starter.
Transmission and PTO Specifications:
Equipped with a gear transmission providing 6 forward and 2 reverse speeds, the tractor includes a live 540 RPM rear PTO that is rated for 535 RPM at an engine speed of 1600 RPM.
Dimensions and Chassis Details:
This 4026 lb tractor has a 126-inch length and a 74.8-inch wheelbase, providing 16.5 inches of front axle clearance on a standard-tread 25A chassis.
Production
| Description | Standard-tread tractor / Built in Brno, Czechoslovakia |
|---|---|
| Manufacturer | Zetor |
| Total built | 158,570 |
Engine
| Engine type | Zetor 2.1L 2-cyl diesel |
|---|---|
| Fuel tank | 11.9 gal (45.0 L) |
| Bore/Stroke | 4.134x4.724 inches (105 x 120 mm) |
| Compression | 18:1 |
| Description | Zetor / diesel / 2-cylinder / liquid-cooled |
| Displacement | 126.8 ci (2.1 L) |
| Power | 25 hp (18.6 kW) |
| Rated RPM | 1800 |
| Starter power | 4 hp (3.0 kW) |
| Starter volts | 12 |
Transmission
| Clutch | dry disc |
|---|---|
| Gears | 6 forward and 2 reverse |
| Transmission type | 6-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Drive type | Two-wheel drive |
PTO
| Engine RPM | 535@1600 |
|---|---|
| Rear PTO | live |
| Rear PTO Type | 540 |
Electrical
| Battery AH | 150 |
|---|---|
| Battery volts | 12 |
| Charging amps | 12.5 |
| Charging system | generator |
| Ground | negative |
Dimensions & Tires
| Clearance (front axle) | 16.5 inches (41 cm) |
|---|---|
| Front tread | 47.2 to 59.1 inches (119 to 150 cm) |
| Length | 126 inches (320 cm) |
| Rear tread | 47.2 to 59.1 inches (119 to 150 cm) |
| Weight | 4026 lbs (1826 kg) |
| Wheelbase | 74.8 inches (189 cm) |
| Front tire | 5.50-16 |
| Rear tire | 11.25-24 |
| Weight | 4026 lbs (1826 kg) |
| Wheelbase | 74.8 inches (189 cm) |
| Ag front | 5.50-16 |
| Ag rear | 11.25-24 |
Links
| Description | Zetor Model 25 A: Photos and information on the 25A from Kurt Ristniemi / Zetor 25: Photos, data, and wiring information on the 25 in Finland |
|---|
Variants
| 25A | standard chassis |
|---|---|
| 25K | row-crop chassis |