I haven't seen that one myself, but my guess is it's an early version of the reverse safety switch. It probably was supposed to be set up so when the hydro lever moves from forward to reverse it hits the long metal lever and interupts pto power. The reverse safety switches were not wired to kill the engine, just to stop the pto.
I'm not 100% sure, but that's my best guess.
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1864 w/48" deck, 2084 w/54" deck + 54" blade, 3204 w/48" deck
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