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2. Three-point hitch - Wikipedia

   en.wikipedia.org/wiki/Three-point_hitch

   Adjustable three-point ball on lift arm. Ball may be rotated to fit either Category I or Category II implements Rear three-point hitch of a Case IH tractor with implement attached by the drawbar. There are five different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins. [2]

3. ISO 13849 - Wikipedia

   en.wikipedia.org/wiki/ISO_13849

   Category 3 is the first architecture with a redundant structure. Building on Category B, and using components with MTTF D = Low to High, this architecture introduces cross-monitoring between the two active channels, as well as cyclic monitoring of the output device(s). Category 3 requires DC avg Low to Medium, i.e., 60% ≤ DC < 99%. A minimum ...

4. Quick coupler - Wikipedia

   en.wikipedia.org/wiki/Quick_coupler

   Quick couplers (also called quick hitches) are used with construction machines to allow the rapid change of working tools or buckets and attachments on the machine. They remove the need to use hammers to manually drive out and insert the mounting pins for attachments.

5. Ferguson TE20 - Wikipedia

   en.wikipedia.org/wiki/Ferguson_TE20

   It marked a major advance in tractor design, distinguished by light weight, small size, manoeuvrability and versatility. The TE20 popularised Harry Ferguson's invention of the hydraulic three-point hitch system around the world, and the system quickly became an international standard for tractors of all makes and sizes that has remained to this ...

6. Ford N-series tractor - Wikipedia

   en.wikipedia.org/wiki/Ford_N-series_tractor

   The Ford N-series tractors were a line of farm tractors produced by the Ford Motor Company between 1939 and 1952, spanning the 9N, 2N, and 8N models. [1]The 9N was the first American-made production-model tractor to incorporate Harry Ferguson's three-point hitch system, a design still used on most modern tractors today.

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