The Zetor 25K, an enduring symbol of agricultural heritage, embodies the essence of reliability and simplicity. With its iconic design and robust construction, this historic tractor remains a beloved choice for farmers and collectors alike. Renowned for its rugged performance and versatility, the Zetor 25K continues to command admiration for its timeless charm and enduring legacy in the annals of tractor history. Whether working the fields or showcased as a prized collectible, the Zetor 25K stands as a testament to the ingenuity and craftsmanship of its era, capturing the imagination of enthusiasts around the world.
| ENGINE |
|---|
| Type | Two-cylinder, vertical, four-cycle high-pressure Diesel |
| Valves | In head, replaceable, wet cylinder liners |
| Bore | 4 1/5 in. |
| Stroke | 4 3/4 in. |
| Displacement | 1/4 gallon |
| Compression ratio | 18:1 |
| Cylinder head | With precombustion chambers common for both cylinders |
| Fuel consumption | 7 ounces HP/hr |
| STEERING |
|---|
| Type | Worm and worm gear |
| Reduction ratio | 1:17 |
| Steering wheel diameter | 16 1/2 in. |
| Additional | Electric horn button |
| Minimum turning radius | 21 ft. 3 3/4″ |
| CLUTCH |
|---|
| Type | Dry, single-disc |
| Diameter | 11 in. |
| Pressure springs | 9 |
| GEARBOX |
|---|
| Speeds | 6 forward, 2 reverse |
| Speeds | (miles per hour/hr) |
| First gear | 2.40 |
| Second gear | 3.12 |
| Third gear | 4.00 |
| Fourth gear | 6.62 |
| Fifth gear | 8.66 |
| Sixth gear | 11.25 |
| First reverse | 1.65 |
| Second reverse | 4.25 |
| REAR AXLE |
|---|
| Differential driving pinion | Made of nickel chromium alloy steel |
| Bearings | 2 tapered roller bearings |
| Reduction ratio (pinion and differential crown wheel) | 4.7/1 |
| Final reduction ratio (to rear wheel axles) | 48/1 |
| FRONT AXLE |
|---|
| Type | Steel casting, square section |
| WHEELS |
|---|
| Front | Automotive with pneumatic tyres 6,50—16 |
| Rear | Discs with pneumatic tyres 9,00—36 |
| P.T.O.: |
|---|
| Speed | 535 RPM at rated engine speed (1,600 RPM) |
| Spline shaft diameter | 1 3/8 in. (S. A. E. standard) |
| BELT PULLEY |
|---|
| Diameter | 9 7/8 in. |
| Speed | 880 RPM at rated engine speed (1,600 RPM) |
| Belt speed | 3 ft. 9 3/5”/sec |
| Special order | Belt pulley shield available |
| DASHBOARD |
|---|
| Instruments | Oil pressure gauge, water temperature gauge (both with indirect light), headlights switch, glowing plug and starter switch, charging pilot lamp (ammeter substitution available on request) |
Zetor 25K Overview
As a historical model in today’s context and a cherished piece among collectors, the Zetor 25K holds a special place in the annals of tractor history. Introduced during a period when agricultural mechanization was undergoing significant advancements, the Zetor 25K represented a pinnacle of tractor technology of its time, offering farmers a reliable and efficient solution for their farming needs.
From an overview perspective, the Zetor 25K exudes a timeless charm with its rugged yet elegant design, reflecting the craftsmanship and attention to detail characteristic of vintage tractors. Powered by a two-cylinder, vertical, four-cycle high-pressure Diesel engine, the Zetor 25K boasted formidable performance capabilities tailored to the agricultural demands of its era. With a displacement of 1/4 gallon and a compression ratio of 18:1, this engine delivered ample torque and power for a variety of farm tasks, from plowing fields to hauling loads.
The steering system of the Zetor 25K, featuring a worm and worm gear type mechanism with a reduction ratio of 1:17, epitomized simplicity and reliability, providing operators with precise control over the tractor’s movements. Paired with a minimum turning radius of 21 feet 3 3/4 inches, this steering setup facilitated maneuverability in tight spaces, ensuring efficient operation in the field.
The clutch system of the Zetor 25K, with its dry, single-disc configuration and nine pressure springs, exemplified durability and ease of use, allowing for smooth engagement and disengagement of power transmission during various agricultural tasks. Combined with a gearbox offering six forward and two reverse speeds, the Zetor 25K provided farmers with versatility and flexibility in adapting to different operating conditions, enhancing productivity on the farm.
The rear axle of the Zetor 25K, equipped with a differential driving pinion made of premium nickel chromium alloy steel and a reduction ratio of 4.7:1, symbolized robustness and reliability, ensuring optimal torque distribution to the rear wheel axles for enhanced traction and stability, even in challenging terrain.
Zetor 25K featured front automotive wheels with pneumatic tires and rear discs with pneumatic tires, offering a balanced combination of comfort and performance for agricultural operations. This tire configuration, along with the tractor’s sturdy construction, made the Zetor 25K a dependable workhorse on the farm, capable of withstanding the rigors of daily use.
As a historical model in today’s context, the Zetor 25K holds significant value among collectors and enthusiasts of vintage tractors. Its iconic design, coupled with its technological prowess for its time, makes it a sought-after piece for those passionate about preserving agricultural heritage. Whether showcased in collections or restored to its former glory for exhibition purposes, the Zetor 25K serves as a testament to the evolution of tractor technology and its enduring legacy in shaping modern agriculture.
