Toplink Assemblies Product Guide

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1. Top Link Assembliesã What is a Top Link Assembly?Usedto attachfarmmachinery implements to a tractor,the 3-pointlinkage systemcomprises of three moveable arms forming…
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  • 1. Top Link Assemblies• What is a Top Link Assembly?Usedto attachfarmmachinery implements to a tractor,the 3-pointlinkage systemcomprises of three moveable arms forming a triangle or‘A’ shape at the back of a tractor.The two lower arms, or hitchlifting arms, are controlledby the tractor’shydraulicsystemproviding lifting, loweringand tilting of the implement.The top link is the centralupper arm, whichis not usually powered by the tractorshydraulicSystem,and connectsto theimplement.Presentedby www.malpasonline.co.ukTop link
  • 2. Top Link Assemblies• How are Top Links Categorised?The linkage of a tractoris usually described in terms of category0, 1, 2, 3 or 4. Thetableshows the dimensions which correspondto these Categories.Top Link LowerLink(Imperial) (Metric) (Imperial) (Metric)Cat0 5/8 16mm 5/8 16mmCat1 3/4 19mm 7/8 22mmCat20mm - 20mm - -Cat2 1 25mm 1 1/8 28mmCat28mm - 28mm - -Cat30mm - 30mm - -Cat3 1 1/4 32mm 1 7/16 36mmCat4 1 3/4 45mm 2 51mm
  • 3. The left hand threadend of a top link denotes the tractorend and therighthand thread end of a top link denotes the implement end.The locking collar is normally used at the implement end of the top link.Top Link Assemblies• Top Link SpecificsImplementendTractorEndLockingCollar
  • 4. Top Link Assemblies• Top Link MeasurementsFortop links the firstcategorymeasurement shown denotes the tractorend.The second categorymeasurement shown denotes the implement end.i.e. :- cat 2/3denotes cat2 is tractorend of the top link, cat 3 is theimplement end.Cat3implementendCat2tractorend
  • 5. Some tractoryokes have specific metric measurements rather than acategorysize. These measurementsare shown, as an example28mm/cat2. Thisdenotes 28mm is the tractorend of the top link andcat2 is the implement end.The Min-Maxadjustmentmeasurementof a top link is taken betweenthe centresof each ball, knuckle or hook end.Sampletop link ends:Top Link Assemblies• Alternative Top Link MeasurementsBallEnd Hook End KnuckleEndMin-MaxAdjustment
  • 6. Top Link Assemblies• Further InformationYou can find further information on tractor toplink assemblies by readingour blog at www.malpasonline.co.uk/info/top_link_assemblies.aspx
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