We had similar issues with our 3GM30 with Kanzaki transmission about 5 years ago. The shaft was not turning fast enough until RPM’s got up to a certain point then would sort of fully engage but the blades were not symmetrically deployed causing the vibration. Cause was the transmission cone and matching part were not quite fully engaged causing a polishing and slippage. Very long story short, got it rebuilt twice – the first guy messed it up and is now fine. An essential element of the rebuild is to ensure the shift lever is properly shimmed so the cone is fully engaged at the lever stop – a skill I am told only a mechanic with Kanzaki experience really understands
An essential item of this is to ensure the spring loaded attachment on the cable end is properly adjusted such that the lever on the transmission is fully engaged before the lever on the pedestal reaches its end of travel in both forward and reverse. In other words, when the transmission is fully in gear you have additional travel of the pedestal lever before its end of travel. You can feel the spring resistance. In our case, using the bracket on the engine, we set the cable so that at neutral the pedestal lever was at mid point. There are two attachment holes on the transmission lever. We use the inner one as the outer one has too much travel to permit the spring action. A recommended annual maintenance item is to put a drop or two of oil into this spring and ensure it moves freely in both directions. My two cents American John and Maryann Legacy III 1982 C&C 34 Noank, CT --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
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