Commissioned following the meetings of June 2001 in Frankfurt of ISO/TC 23/SC2. Working Group 5 of which subsequently produced ISO DIS 5674 'Tractors and machinery for agriculture and forestry-guards for power take-off (PTO) drive shafts - wear and strength tests', incorporating the latest proposed changes to the standard. These proposals included test methods and pass-fail criteria, which were derived from various sources, including practical tests, manufacturers own research and previous projects sponsored by the HSE. Undertaken primarily to investigate developments with CEN on the same subject under the terms of the Vienna Agreement. The particular draft standard (PrEN 12965) is intended to define the safety issues surrounding PTO shaft guards and the tests it calls up are contained in EN 1152 which is the equivalent of ISO 5674. The CEN working group will pass all activities on this subject over to the ISO working group after it has produced EN12965. It was also considered necessary to examine how the standard could be applied to new designs of guard, which are needed to fit shafts with an ever-increasing number of special attachments. The designers are currently limited in how they can adapt to technical change by the way the standard is written. It was intended to provoke discussion, attract input from experts and provide technical data, which would contribute to the process of revising the standard.
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