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Hey!!! We have an Ex-mark mower (hydro-drive), big Kohler engine.....while mowing, the (electric) PTO stopped, killing the mower deck. Engine ran until we pulled into the garage and shut it down. There are 2 - 20 amp fuses, both good...DMM reads power at starter, but engine wont turn, or even "click".....it's just dead.....suggestions?

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  • bgyarbray May 30, 2010

    Can you help? The engine is fine...Ex-Mark LCT4818KC....running fine, suddenly lost electric PTO, shut engine down to check it out, now starter sw. won't pass power to the starter.

  • bgyarbray May 31, 2010

    Not really...

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2 Answers

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  • 11,896 Answers

If there is power to starter but starter doesn't turn over, then it is likely the solenoid is shot. Try jumping the terminals which bypasses the starter and ignition. See if she turns over then. If nothing, you know for surely that solenoid is no good.

Posted on May 30, 2010

  • 4 more comments 
  • bgyarbray May 30, 2010

    Don't know why the heck I didn't do that to begin with. Dark now...I'll check tomorrow.....Thanks, you may hear me squawking again!!!

  • bgyarbray May 30, 2010

    BTW....Think the elec. PTO going down like that has a bearing on this problem? Everything was fine until the clutch on the PTO dropped out, (electrically)....

  • Nate Stansfield
    Nate Stansfield May 30, 2010

    Oh I see. The PTO is not allowing power from switch to starter itself.
    That could be due to the electric clutch not engaging or not engaging the clutch switch which allows power to be sent from the starter. Kind of like the clutch switch or neutral switch on a car.


  • bgyarbray May 30, 2010

    Right....the engine won't even turn over with the PTO sw. engaged.....and now, it won't turn regardless of the PTO switch position, on or off....

  • bgyarbray May 30, 2010

    BTW I checked the PTO sw. for continuity w/ my DMM, and it appears to be ok....

  • Nate Stansfield
    Nate Stansfield May 31, 2010

    Try the "operator out of the seat while operating the pto" sequence. Transmission in neutral
    with emergency brake locked.


    See if the engine will start.


    If you can locate the pto
    safety switch - try to jump the connector by unplugging it from the
    wiring harness and shorting it with a piece of electrical wire.
    if nothing else works why not try disconnecting the battery lead for a
    few minutes to see if this resets the computer? I think it is worth a
    try.


    Another thing you can try is: Disconnect the plug wire(for safety) and
    see if the motor turns over by hand. Most of them use an electric
    PTO clutch and its held on with a bolt into the crankshaft, put a
    wrench/socket on it and you should be able to turn motor, if you can't
    the motor is likely kaput(junk). You have checked the battery
    cables at the battery and made sure they are nice and clean. A dirty or
    loose battery cable will make a regular
    vehicle act stupid(affects the computor) and will play heck with most
    anything with a 12 volt system.


    Another thing you can try is: push in your pto switch, one of the clunks
    you likely are
    hearing is you electric pto clutch engaging, and
    your
    tractor will not start/crank, until you turn it off/push
    it
    in.

    Also, there is
    a relay behind the dash rather than the
    solenoid. You can swap the relays around to see if that changes things.
    There are also 3? fuses to check. One that affects the power to the ign
    switch and therefore the solenoids.


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Sounds like the engine locked up!

how long have you had this and how often have you changed the oil?

what mower model do you have have and what year?

Posted on May 30, 2010

  • 3 more comments 
  • bgyarbray May 30, 2010

    Motor definately not locked....Brother-in-law uses it with his business (lawn care) ....Mower is 3 YO, and very well maintained...this is most likely a prob. w/ a safety switch or relay....We thought you guys might know where and which to check.

  • bgyarbray May 30, 2010

    Engine not locked....Ex-Mark model LCT4818KC....

  • Sean Reisdorf
    Sean Reisdorf May 30, 2010

    now I'm confused
    in your original post you stated you had 12v to the starter
    now you do not?



  • bgyarbray May 30, 2010

    12V present at the (main) pos. cable on starter, solenoid apparently not "passing" power . You can't even hear a "click" that would indicate the starter "trying". It's as if there were a broken connection, or blown fuse. I checked for both....No go..

  • Sean Reisdorf
    Sean Reisdorf May 31, 2010

    lets see if we have power to the starter relay and/or if we can bypass the relay




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The engine runs but the blades do not engage? Make sure the wire connecting the electric clutch is still plugged in. If all is connected and the belt is really fine, there is a problem with either the electric clutch or PTO switch.

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I have a Toro 42 zero turn mower and the blades stop turning while mowing. The PTO switch knob melted. I replaced the PTO switch and the blades turned for 5 min. and then the PTO switch melted again.


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It sounds like the engine running fine until engage the clutch. It more likely that you have a safety switch related problem like a bad seat switch or loose connector..

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I have a John Deere garden tractor 420 I was mowing the engine stopped I check the 25 amp fuse it was blown. I replaced it turned the key there is absolutely no power


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I have a troy bilt 42 inch 17 hp lawn tractor. The problem is when I cut grass and i get in some thicker grass the blades turn off then I back out the blades restart. The engine never bogs down


One or more of your drive belts is in need of adjustment or replacement, maybe. Possibly, your electric (or manual) PTO clutch could also be adjusted. You do have the spring tensioner on the deck engaged, right? You say the engine doesn't bog when this happens so I am inclined to think "clutch" and/or "PTO belt" to the deck and/or the "deck tensioner" are the things to check.

The tensioner will be the easiest, it is a handle on the left side ON the deck. Has a BIG spring on it. Make sure it is engaged.

Is yours a Troy Bilt manufactured in Troy New York or is it another manufacturer (MTD?). Troy Bilt is actually out of business, having sold the Troy name to a variety of makers depending on the model line. I don't have the run down on who makes what any more (tillers, chippers, mowers, blowers, trimmers, etc.), but Troy Bilt of Troy, NY is no more. :-(

I have a 16 HP Troy with 42 inch deck driven through a electric clutch. I also have a "grass pump" on my deck. Important maintenance tips: Keep the bearings greased, keep the deck clean underneath. The belt on the deck should have the tensioner released when you are NOT mowing. Keep the blades sharp and in good repair. Mow with engine at full speed. When you get to areas of heavy growth, slow the tractor down (hydro drive) or reduce to a lower gear (gear drive). NEVER adjust speed using the "clutch" (hydro drive or gear drive). When you engage the blades (electric or manual) always have the engine just above idle, bring the engine speed up slowly to preserve the belts and reduce stress on all components.

I am sure this is the fix for your trouble. If there is anything else or if I missed the ball, please let me know and we will go further.

Thanks for your question @ FixYa.com

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I need a belt diagram for a ranch king king plus also i need to know the size for the main drive belt


Ranch King is a brand name of the manufacturer MTD.

Product manuals with part blow-up diagrams are available from MTD's web site,
http://www.mtdproducts.com/
Models are identified from the model number printed on a label under the mower seat.
The PTO and deck drive belts are shown on one diagram and the transmission drive belt is shown on another. The Form number on my printed Operator's Manual is 770-10526A (22HP, 46in cut) for Hydrostatic 817/818 models.

Parts can be ordered directly from MTD or other distributors on the web.

It is my experience that original brand name MTD belts work best.

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The drive belt which runs from the engine pulley back to the hydro drive unit to provide over-the-ground propulsion is part #754-0349.

A mower has either an electric PTO or a manual PTO, not both.

The electric PTO belt the provides power to the blade deck (runs around the electric clutch on the engine shaft (activated by electric switch, not the mechanical hand lever that engages the mower deck) is p/n 754-0476 for the 46" deck.

The manual PTO belt the provides power to the blade deck (runs off the pulley on the engine shaft (activated the mechanical hand lever to the left of the steering wheel that engages the mower deck) is p/n 754-0228 for the 46" deck.

The deck belt that goes around the 3 blade spindle assemblies on the mower deck, to drive the grass cutting blades is p/n 754-0349

In my experience, the PTO belt lasts about half a season, the other belts break about every other season when mowing 4 acres weekly.

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