My SD60 clutch started slipping after 200 hrs, 18 months. I am not happy, it has been treated well. The gearbox
is now being serviced in Corfu, Greece
on warranty. (in theory!) It's much harder to service
than the SD50
, as the engine has to be moved forward 100mm (4") to clear the shaft.
Comparing the service manuals
, this gearbox is very similar to the old Volvo
130S. How come Yanmar have all the problems, does anybody know who actually makes the gearbox, ZF or Yanmar? The clutches seem far too small to transmit the power, it seems they do, but not for long!
The gear lever travel is critical, but there is nothing to measure from. The drawing looks easy, but hard in real life, I made a bracket to hold a ruler. Yanmar provide a measuring bracket, but we don't have one. It's crazy that adjustment could be causing the problems, but it's hard to measure, nobody would bother.
So this could be the way to check the travel. First disconnect the cable, and measure the position of the inner hole of the lever. There is a little backlash, so measure both neutral positions, then use the midpoint. Then measure the travel for forward and reverse gears. The required travel should be no more than 24mm. Then fit the cable, and make sure the positions are within the neutral, and beyond the gear selected positions. Yanmar say the provided travel should be greater than 30mm.
I checked this when the gearbox failed, I think it was fairly right. But I will be checking the gear lever travel regularly in future. I hope this will avoid future problems.
SD60 Service manual:- https://www.dropbox.com/s/yifapa515r...anual.pdf?dl=0