Simplicity 12.5 LTH blades disengage when shifting out of neutral
I bought this lawn mower used last year and it worked fine. The safety for the seat has been removed and replaced with a jumped by the previous owner. I have had issues for the past couple months with the blades staying engaged. Before if I would turn the throttle down, the blades would stay engaged. Then they would only stay engaged for a little while. I have verified with a feeler gauge that the clutch is set between 0.010 and 0.012 on all three slots. I removed the clutch and verified that when the PTO switch is engaged that the voltage at the clutch increases from 0 to 21V. I cleaned the clutch, lubricated and replaced, reset the gaps and it cut fine. 2.5 weeks later the blades keep disengaging. With the seat safety off I was able to engage the blades, disengage the tranny and push/pull it to get my backyard. I tried to ride it again, shifted and it shut off. My great-uncle-in-law thinks it is a neutral interlock of some kind, but I can't find a good wiring diagram anywhere for where that might be located or how to test it.
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