ISO 17567:2020

Overview

ISO 17567:2020 - "Agricultural and forestry tractors and implements - Hydraulic power beyond" defines the interfaces and requirements for providing hydraulic power and control from tractors to mounted or trailed implements. The standard specifies the number, type, capacity and identification of connections (pressure, return, load-signal, drain) and sets flow classes, coupling sizes, testing and installation guidance to enable safe, interoperable tractor–implement hydraulic systems.

Key topics

• Definition of hydraulic power beyond and related terms (pressure port, return, load signal, drain, hydraulic power beyond kit).
• Hydraulic system types covered:
  • Open-centre systems
  • Constant-pressure closed-centre systems
  • Load-sensing closed-centre systems (including fixed-displacement pump arrangements)
• Flow classes for a single connection (rated flow examples: up to 90, 148, 220, 450 l/min) and associated coupler performance.
• Quick-action couplings: recommended use of ISO 16028 female halves on tractors; sizing guidance tied to flow classes and port types.
• Identification: standardized port symbols (P = Pressure, R = Return, LS = Load sense, D = Drain).
• Performance limits: drain back-pressure limits (≤100 kPa gauge at 20 l/min; ≤25 kPa gauge at zero flow) and requirements for load-signal pressure drop specification.
• Testing: flow and power measurement guidance referencing ISO/OECD 789‑10 and procedures for measuring return/drain pressures and load-signal pressure drop.

Practical applications & users

ISO 17567:2020 is intended for:

• Tractor manufacturers (OEMs) - to specify and install compatible hydraulic power beyond ports and kits.
• Implement and equipment manufacturers - to design implements that interface reliably with tractor hydraulic outputs and load-sensing networks.
• Component suppliers - quick-coupler and hose manufacturers ensuring correct sizes and self-sealing/breakaway features.
• Test laboratories and compliance engineers - for validating flow class, pressure drop and drain/return performance per referenced test methods.
• Agricultural service providers and fleet managers - to understand compatibility and safe connection practices between tractors and implements.

Use cases include powering hydraulic motors on implements, providing control signals for implement valves, and standardizing quick-connect interfaces for multi-brand interoperability.

Related standards

• ISO 5598 - Fluid power vocabulary
• ISO 10448 - Hydraulic pressure for implements
• ISO 16028 - Flush‑face quick‑action couplings
• ISO/OECD 789‑10 - Test procedures for hydraulic power at tractor/implement interface
• ISO 5675, ISO 1219-1 - Coupler location and graphical symbols

ISO 17567:2020 helps ensure safe, interoperable hydraulic connections across agricultural and forestry tractors and implements, reducing installation ambiguity and improving system reliability. Keywords: ISO 17567:2020, hydraulic power beyond, agricultural tractors, quick-action couplings, flow class, load sensing.