"Lloyd E. Sponenburgh" wrote in message
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"cilorentson" wrote in message
...

Where can I see a 'dog clutch'? thanks

One place is on a Great Dane truck. G

The other would be on a free-wheeling PTO clutch for old tractors with
'dead' PTOs.

I'm not sure where you'd see a dog clutch on any modern equipment.
What I class as a dog clutch, is a clutch where two drive shafts lock into
each other (ie. it's either engaged or disengaged).
The most common one I can think off, is where each side of the clutch is
like a castelated nut, that engage into each other. They are a relativley
crude type of clutch, but are cheap, simple and effective.