On 04/05/2015 18:05, Bob Minchin wrote:
F wrote:
I've suddenly been getting some severe vibrations from my mower and it's
stopped driving the blades and itself. Taking the cover off to reveal
the drive shaft shows some pretty bad damage.

As I've not had the cover off before, I'm not sure how things should be
arranged, but I'm sure there should be more metal in there!
Should the metal 'prongs' on the outboard part be resting inside the
rubber cutouts? If so, has the Allen screw allowed the cutout carrier to
move inboard on the shaft?

Anyone care to advise on what needs to be adjusted and/or replaced?

Images at http://tinyurl.com/q7t73oe


Yes the prongs should be in the recesses in the rubber and not touching
the other set.
One half or other of the oldham coupling as it is called has shifted.
Yes it could be the diecast part if the grub screws have come loose or
the steel half could have moved.
If it is the diecast part that has moved, then there will be tell tale
marks on the shaft from where they first were fitted and then slipped.

Thanks! Fixed! Neither Allen screw was particularly loose so the move
apart must have been slow but steady.

And a bonus: having now mown the lawn within 36 hours of returning from
a month long trip, I'm in Management's good books.

--
F

www.vulcantothesky.org - keep the last remaining Vulcan flying