Join Date: Jun 2002
Location: Plymouth MA
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Hi, mine is having the same problem (again); a Yanmar 3HM35F with the Kanzaki manual transmission (model KBW10 2.14:1). It is only the forward that this happens, as it is used more than the reverse obviously. Mine is a cone clutch, and the 'cone' goes or wears, thereby not gripping the other cone/plate.
You must scour the Yanmar manual as to what oil or ATF to use in your tranny; my manual covers 4 different engines, and 3 of the 4 use engine oil in the tranny, but mine specifically says to use ATF-A (now Dexron III).
And a previous poster is correct about the right amount (also stated in the engine manual) and to NOT screw in the dipstick but measure with it sitting on top of the threads.
I am probably looking at a rebuilt install w/ a core charge to expedite; am hoping to remove and install my self w/ some help of a knowledgable friend.
It becomes all about the alignment afterwards too.
You can look on ebay for rebuilts, or local marine tranny shops.