PTO engage/engine shut down

Discussion in 'Mechanic and Repair' started by Green_Will, Mar 19, 2013.

  1. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    I have an '06 Scag 48" Velocity deck with the 17hp Kawa. engine. It ran fine last year, no problems. I adjusted the deck height (removed 3 bolts on each side, moved it down to lowest of 3 holes) I ran it today and when I engage the blades the engine shuts down. The engine is not struggling to engage the blades, it shuts down like a safety measure is tripping. Brake and operator paddles and gear engagement shut down the mower properly. I'm assuming moving the deck around possibly loosened the clutch wire? I checked connections-OK, but I did not clean any connections. Any advice here would be appreciated. Thanks.
  2. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    For the sake of full disclosure, I also changed the oil, removed sharpened and replaced the blades, greased it, and replaced a broken grease fitting on the "brake plate" on the right wheel.
  3. Snyder's Lawn Inc

    Snyder's Lawn Inc LawnSite Platinum Member
    Messages: 4,530

    Sometimes them safety switches will stick or go bad
    I have a 2012 DC and the brake switch will stick and try engage the PTO it will kill engine So I have to shake the brake handle to get un stuck
    I have new switch on the shelf to install when I get mower out
  4. dieselss

    dieselss LawnSite Silver Member
    Messages: 2,042

    x2 on the safety switches. start by figuring out which one is bad
  5. kawakx125

    kawakx125 LawnSite Bronze Member
    Messages: 1,130

    on my wright stander there is a circuit board plug, sometimes that'll get dirty connections and shut mine down like you are saying, especially during leaf cleanup season.
  6. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    Thanks for the help so far, guys. I'll keep you posted.
  7. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    I have another unrelated issue with the mower... should I start a new thread to address that or just post it here?
  8. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    So I unplugged, cleaned, and plugged in all the connections on the wiring harness down to the PTO clutch. I also loosened the tension on the belts to rule out the belts being too tight. I can see the spindles turn, but the engine still shuts off. Just to be sure, I deliberately engaged the safety shut off on the brake, drive gear, and the operator present paddles. They work properly. I was sure I had loosened a wire when I moved the cutter deck, but I checked all the wires. Any other ideas?
  9. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,114

    Could be a bad PTO switch. It's usually more than just a simple on-off switch! It usually controls a couple of circuits, including the kill/grounding cir.
  10. Green_Will

    Green_Will LawnSite Member
    Messages: 63

    Thanks for your input so far. Replaced PTO switch-no change. Stumped.

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