gearbox KBW10

[robman57]

i have a KBW10 box with may yanmar 2qm20h, its not driving in forward but reverse is fine, has a wine in forward also, what possibly could be the problem im about to pull the box out

[Crew of Turning]

Have the same gearbox and engine setup in my boat WITH the same problem. THE shop to fix these is ANTHONY KEATS here in Ontario Canada. Their technician with a good reputation by the way figures its thrust washers and a disk wear out problem. The bottom line is it is fixable. He will rebuild the clutches end to end for about $1300.00. You can not get a replacement unit new as it is a legacy item(obsolete) but the parts are still available. Check your linkage travel first. You need 35mm or 1 1/2 inches from neutral to fwd or to rev. Good luck...I am pulling mine for overhaul when the snow reduces. Fyi box has been with this boat since 1977.

[forsailbyowner]

Im seeing the trans mentioned as Kansaki/hurth. This may be useful information for you at rebuild time to get some more life out of the trans between rebuilds.

ZF/Hurth Marine Transmissions: A Six Step Program | Foley Engines

[robman57]

Thanks heaps for the info, ill take a look at the site

[robman57]

Thanks for the advice, unfortunitly im in NZ so a bit far to Ontario to get it fixed ha ha
Had it out couldnt find too much wrong so putting it back in this week, didnt apear to be to much wear, see what happens maybe the new oil may do the job, will soon find out

[forsailbyowner]

I dont think youd be able to see anything, the steels and clutches are not too visible. Mine looked fine inside when it had failed. Theyre a pita to rebuild. Assemble a few parts. take measurements, buy a correct ship, assemble some more, more measurements maybe need another shim. Cant tell what your going to need till you get to the next measurement point. Took ordering a couple of shims for me in different orders and they were around $40 apiece. I guess every rebuild will be different. Did you see if the clutches were grabbing when you had it out?

[robman57]

Had a mechanic mate pull it apart so i didnt get to see much, will no more in a few days and will keep you posted on the out come