BS ISO 10448:2021 pdf download – Agricultural tractors — Hydraulic pressure for implements
This document specifies the characteristics of the hydraulic pressure from agricultural tractors to connect hydraulic devices on implements, to permit interchangeable use of various types of implements using remote cylinders and other hydraulic devices.
It applies to agricultural tractors intended for interchangeable implements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 730, Agricultural wheeled tractors — Rear-mounted three-point linkage — Categories 1N, 1, 2N, 2,3N, 3, 4N and 4
ISO/OECD 789-10, Agricultural tractors — Test procedures — Part 10: Hydraulic power at tractor/implement interface
ISO 5675, Agricultural tractors and machinery — General purpose quick-action hydraulic couplers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
coupler pair
pair of female hydraulic couplers compatible with male couplers, specified in ISO 5675, mounted on agricultural tractors and connected to the hydraulic system to allow flow from one coupler to the other
available differential pressure
steady state difference in hydraulic pressure between two coupler parts on the implement side
maximum pressure
maximum steady state hydraulic pressure at either male coupler connected to a coupler pair (3.1)
maximum loop return pressure
maximum steady hydraulic pressure at the male coupler returning flow to a hydraulic system that can reverse the flow through that coupler
maximum sump return pressure
<with coupler> maximum steady state hydraulic pressure at the male coupler returning flow directly to the reservoir.BS ISO 10448 pdf download.