Helping my GF with her rider. Wondering how hard it is to change this. Looks easy (maybe). Blade will not disengage. Can these ever be repaired? How does it work inside? How do they fail? Thanks

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

It's pretty much like the clutch on an A/C compressor. It's normally not engaged until energized. Disconnect the wires going to it. If it is still engaged you have a mechanical problem, if it dis-engages then the control circuit has a fault. If debris has jammed it, it may be possible to clear it. I tried to remove the electric clutch on a friends
Cub so I could replace a belt, but it requires a special puller. I suspect your mower will be the same.

Dealer says these are easy to remove. Says he never saw a seized one.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Sounds like it should be easy to fix.