Zetor 25A
The Zetor 25A is a tractor produced by Zetor. It is equipped with a 126.8 ci 2.1 L engine. The listed engine power is Diesel (listed): 25 hp / 18.6 kW; Diesel (listed): 4 hp / 3.0 kW. Transmission: 6 forward and 2 reverse. Operating weight: 4026 lbs 1826 kg.
Engine Power
Diesel (listed): 25 hp / 18.6 kW; Diesel (listed): 4 hp / 3.0 kW
Fuel & Capacities
11.9 gal
45.0 L
Transmission
6 forward and 2 reverse
Operating Weight
4026 lbs
1826 kg
Overview
 | 1949 - 1961
Standard-tread tractor |
|---|
Production | |
|---|---|
Manufacturer | Zetor |
Standard-tread tractor | |
Built in Brno, Czechoslovakia | |
Total built | 158,570 |
Variants | |
|---|---|
25A | standard chassis |
25K | row-crop chassis |
Zetor 25A Engine | |
|---|---|
Zetor 2.1L 2-cyl diesel | |
Fuel tank | 11.9 gal
45.0 L |
Engine details ...  | |
Zetor 25A Transmission | |
|---|---|
6-speed gear | |
Transmission details ...  |
Zetor 25A Power | |
|---|---|
Engine | 25 hp
18.6 kW |
Mechanical | |
|---|---|
Two-wheel drive | |
Open operator station. |
Power Take-off (PTO) | |
|---|---|
Rear PTO | live |
Rear PTO Type | 540 |
Engine RPM | 535@1600 |
Dimensions & Tires | |
|---|---|
Wheelbase | 74.8 inches
189 cm |
Weight | 4026 lbs
1826 kg |
Front tire | 5.50-16 |
Rear tire | 11.25-24 |
Full dimensions and tires ...  | |
Links | |
|---|---|
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 |
Electrical | |
|---|---|
Ground | negative |
Charging system | generator |
Charging amps | 12.5 |
Battery volts | 12 |
Battery AH | 150 |
Engine
Engine Detail — 126.8 ci / 2.1 L Diesel
Manufacturer | Zetor |
Fuel Type | Diesel |
Configuration | 2-cylinder, liquid-cooled |
Displacement | 126.8 ci
2.1 L |
Bore/Stroke | 4.134x4.724 inches
105 x 120 mm |
Power | 25 hp
18.6 kW |
Compression | 18:1 |
Rated RPM | 1800 |
Starter volts | 12 |
Starter power | 4 hp
3.0 kW |
Transmission
Transmission — 6 forward and 2 reverse gear
Type | gear |
Gears | 6 forward and 2 reverse |
Clutch | dry disc |
 | |
Dimensions
Zetor 25A Tires | |
|---|---|
Ag front | 5.50-16 |
Ag rear | 11.25-24 |
Dimensions | |
|---|---|
Wheelbase | 74.8 inches
189 cm |
Length | 126 inches
320 cm |
Weight | 4026 lbs
1826 kg |
Clearance (front axle) | 16.5 inches
41 cm |
Front tread | 47.2 to 59.1 inches
119 to 150 cm |
Rear tread | 47.2 to 59.1 inches
119 to 150 cm |
Photos
1956 Zetor 25A
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Zetor 25A.
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Zetor 25A Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Zetor 25A.
Converted Equivalents:
Horsepower (HP)0 hp
Kilowatts (kW)0 kW
Metric Horsepower (PS / CV)0 PS
Direct Competitor Comparison
Compare Zetor 25A against same-era industry alternatives in the same horsepower class.
Current Model
Zetor
Zetor 25A
Engine Power:Diesel (listed): 25 hp / 18.6 kW; Diesel (listed): 4 hp / 3.0 kW
★ Baseline Reference
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