On 07/05/2019 20:18, newshound wrote:
On 07/05/2019 19:43, Harry Bloomfield wrote:
newshound laid this down on his screen :
Your description of 3 balls in deepening slots made it sound more
like some designs of freewheel to me (rather than a clutch). It's
certainly true that freewheels are usually metal to metal. As TNP
points out there are also various types of metal to metal clutch.
Some use sintered bronze on hardened steel multiplates (later Norton
Commandos, I believe). You don't want steel on steel to see too much
slipping, unless it is in an oil bath.

This is/was just steel on steel. The three balls in the slots, are
just the means to force the clutch plates tightly together, via a coil
spring and bearing.

Interesting. I guess it is just meant to be on-off. Provided the load is
high enough it probably never really slips. I wonder if it is hardened
steel, or just mild steel? Ordinary grey cast iron would probably work
OK as the graphite might help to prevent the metal picking up or scoring.

I have the same mower - mine is probably the 2007 model.

The clutch still works ok on mine, but its definitely a progressive
action. You can engage the blade gradually... usually wise if you are
not sure if the deck is clogged or not - saves stalling it.

--
Cheers,

John.

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