I think Mickey813's answer is correct. On the ST series mowers, there are 2 safety interlock switches that will either prevent the PTO from engaging or kill the engine once the PTO switch (or clutch) is engaged. One of these switches has likely gone bad or the wiring came loose. Oddly, on my ST120, I completely removed the seat safety switch and the 2 wires are disconnected and everything runs fine. If I directly connect them, the clutch or PTO kills the engine when they are engaged. Once when my PTO wasn't engaging, I temporarily bridged the 2 wires with a jumper, started the engine, then engaged the PTO (which killed the engine). After that, once I removed the jumper, the PTO would work like normal again each time I engaged the switch. It's like I reset it somehow by jumping these 2 wires temporarily. Hope that helps...
Check for power to the clutch if yes the clutch could be bad or a wire going to it if no power check the safety switches
SOURCE: When I engage the front PTO the engine dies.
There is somthing in the PTO that is binding up. I am assuming the PTO is for the mower blades. The belt(s) could be binding up, not on the pulleys, etc. The blades should turn by hand easily.
SOURCE: John Deere 160 riding mower. When I try to engage
CK THE SEAT SWICH OR THE BRAKE SWICH ONE OFEM IS BAD
SOURCE: poulan pro hydro 18.5-42 riding lawnmower - back
Your hydro transmission is low/out of oil or it need to be rebuilt or a new one.
SOURCE: i have a bolens 38 inch riding mower. it cranked
did you try depressing the clutch to disengage everything regardless of being in neutral? and it sounds like a pulley bearing went bad.try to spin the pulley with your hand and see if it moves.take the belt off to the mower deck and that should keep them from turning when you go to start it.
Testimonial: "thanks. at least i can crank it and get it to a trailer instead of pushing it. i really appreciate it.......cb"
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