Today, it's the pub's Stihl battery walk-behind mower on the shop bench. I purchased it a year ago, just about, so it's still under warranty.
The right-hand rear (driven) wheel has been having problems with not always wanting to free-wheel when not using the electric drive. This morning, it just plain stuck, making the mower just about impossible to use in tight spots--which is about 50% of the pub lawns.
Being under warranty is great, but it's Saturday and the local Stihl shop is closed for the weekend. I need to do a bunch of mowing on Monday, when the pub is closed, and I want to do it early in the AM as it's been in the eighties and nineties the last few days (it snowed earlier this week).
So the rear drive assembly has to come out.
Fortunately, I have a swamp cooler blowing right across the bench area.
About an hour of fiddling around and head scratching later, I found the problem:
That's a centrifugal clutch--or half of one. One of the sliding weights wasn't much into sliding anymore--you can see rust on the rods it's supposed to slide on. A couple of drops of 10 Wt. ND oil and it freed right up.
Here's the other half of the clutch (one per wheel):
While I had it apart, I greased everything with, no doubt, the wrong grease for plastic gears--but it beats none, I reckon.
It was very satisfying to find nothing broken. Yet.
I'm not sure why just one of the two wheels was sticking, as the clutch drives both. There is no diff in there, which kind of surprised me.
Now to figure out how to put it back together.... After I celebrate with a fine malt beverage. It is, after all, Saturday.