Overview
ISO 2057:1981 is an international standard that specifies the dimensions and assembly requirements for remote control hydraulic cylinders used with agricultural tractors and trailed implements. This second edition, published in 1981, replaces the original 1975 version, streamlining specifications by removing inch-based measurements and refining editorial content. The standard enables hydraulic cylinder interchangeability between tractors and various implements, supporting operational flexibility and equipment compatibility across different tractor categories.
The standard applies to three categories of agricultural tractors based on power at the drawbar:
- Category 1: Up to 35 kW
- Category 2: Between 30 and 75 kW
- Category 3: Over 70 kW
This classification helps ensure the hydraulic cylinders match the power and operational needs of specific tractor classes, allowing for robust and efficient hydraulic control of attached implements.
Key Topics
- Hydraulic Cylinder Specifications: Defines critical dimensions, mounting clearances, and assembly features for hydraulic cylinders used with trailed agricultural implements.
- Interchangeability: Ensures hydraulic components can be transferred or replaced across implements and tractors within the specified power categories, promoting equipment modularity.
- Mounting Dimensions and Clearances: Provides detailed measurements, including length, width, heights, and spacing of key parts such as mobile ends, anchorage points, and clevis pins (clavettes).
- Hydraulic Hose Length and Routing: Specifies hose lengths to allow full movement of implements, including a 100 mm minimum backward movement for three-point hitches, and compliance with existing PTO and drawbar clearance zones (referencing ISO 500).
- Operational Requirements: Includes required actuator stroke times for each tractor category and push force minimums based on piston surface areas and pressure thresholds.
- Attachment Components: Defines design and operational expectations for clevis pins and clevis attachments, emphasizing ease of installation and removal.
- Compatibility with Other ISO Standards: Cross-references related ISO standards such as ISO 500 on PTO and drawbar specifications, ISO 730/1 for three-point hitch categories, and ISO 789/1 for power testing methods.
Applications
ISO 2057:1981 supports the agricultural machinery industry by providing uniform standards for hydraulic control cylinders on tractors and their attached implements. Applications include:
- Trailed Implements Compatibility: Ensures hydraulic cylinders on implements like plows, harrows, seeders, sprayers, and trailers fit tractors from various manufacturers without custom modifications.
- Equipment Interchange and Repair: Facilitates efficient equipment maintenance and replacement by standardizing hydraulic cylinder sizes and attachments, reducing downtime and costs.
- Tractor and Implement Design: Assists manufacturers in designing parts that comply with internationally recognized dimensions, improving global equipment compatibility and market reach.
- Hydraulic System Integration: Helps agricultural engineers and technicians integrate hydraulic control systems that meet performance and safety requirements for given tractor power classes.
- Safety and Reliability: Establishes clear specifications for safe operational clearances and pressure handling, reducing the risk of hydraulic failure or mechanical damage.
Related Standards
To ensure seamless integration and compliance, ISO 2057 references other important standards in the agricultural machinery domain:
- ISO 500: Agricultural tractors - Power take-off and drawbar - Specifications. Governs the safety zones around PTO shafts and drawbar mechanisms crucial for hydraulic hose routing.
- ISO 730/1: Agricultural tractors with wheels - Three-point hitch - Part 7: Categories 1, 2, and 3. Defines hitch geometry vital for determining the hydraulic cylinder mounting and hose lengths.
- ISO 789/1: Agricultural tractors - Test methods - Part 7: Power test. Includes guidelines on engine power testing necessary for classifying tractors under the categories used in ISO 2057.
By harmonizing with these standards, ISO 2057:1981 ensures hydraulic cylinder assemblies are compatible with tractor powertrain and hitching systems globally, promoting international trade and operational consistency.
Keywords: ISO 2057, hydraulic cylinders, agricultural tractors, trailed implements, remote control hydraulics, tractor categories, hydraulic cylinder dimensions, implement compatibility, tractor hitch standards, ISO 500, ISO 730, agricultural machinery standards.