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Mower runs great, until you engagew the PTO. Brakes open fully, any suggestion?

New pulleys, towers and belt. Mower runs at good idle but blows black smoke and cuts off when PTO is engaged.Quickly disengage the PTO and engine will continue to run. idler brakes open fully when PTO is engaged.

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  • Master
  • 2,069 Answers

Sounds like the seat safety switch is not working. Check to see if both wires are connected to that switch. If they are.. then disconnect them, jump them together and see if mower runs Ok

Posted on Jan 08, 2014

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Posted on Jan 02, 2017

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SOURCE: Runs Great until the blad is engaged

Frozen idler pulley under the tractor frame or frozen or damaged bearings on the deck spindles. With no belt tension on these items they should spin freely. If you have the know-how you can fix the problem yourself (parts are available at sears.com or elsewhere), otherwise you will have to bring it in for repair.

Posted on May 18, 2009

lester482529
  • 226 Answers

SOURCE: Engine starts and runs Great. When I engage the

at the point of lowering the pto it's trying tosuck more air to mix with the gas .you might just need to change the air filter.

Posted on Jun 07, 2009

  • 376 Answers

SOURCE: lots of smoke when I engaged stuck blades - now runs roughly

Most likely what you did was burn one or more spots on the belt. When the blades and belt stop turning, like in tall grass, the engine doesn't stop and will burn flat spots on the belt at the engine pulley. Every time the flat spot hits a pulley, it will jump and can set up a bad vibration. Run your hand around the sides of the belt or take it off and you will feel or see the thin spot(s) on it. Replace belt.

Posted on Jun 10, 2009

  • 1 Answer

SOURCE: I just installed mulch kit on my Ariens 34

i'm wanting to install a mulch kit too but it seems diffecult. hoew do you access under the mowing deck to install everything?

Posted on Sep 14, 2009

  • 9 Answers

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.

Posted on Feb 21, 2010

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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2004 gx335 48c mower deck primary pto belt has broken twice new double pulley on rear nothing rubbing no noise


Is the belt overly tight? My mower was doing that to, turned out the belt called for was 1" longer then the belts i was buying for it, making the belt really tight and it kept over heating from rubbing and failing. I would run it for a while then shut everything off and see if the belt is hot, also check that the bearing are not hot, could be friction somewhere causing the belt to heat up and fail.

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John Deere X304 PTO Engagement Problem When Warm


Hi, check your belt tension, check all idler pulleys and drive pulleys for free rotation with the belt off and finally check that the belt is not bottoming out in any of the drive pulleys. If so, replace the belt. The blades should come up to speed imediately wether hot or cold and it sounds like your belt is slipping in one or more of the pulleys which drags the motor revs down until it grips. Regards Phil.

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Mes now keep replacing with john deere parts, cant see any reason why, any ideas?


Maybe the drive belt is to small and pulling on the assembly, and in turn pulling enough to break the bolt. probably is fine when idle, but under load the condition changes, causing tension to be applied and snapping the bold. That would be the first place I would look.

I have also had other bolts come out of other assemblies and everything ran fine. Until one day when it didnt and belts snapped and so did bolts as and my transmission. It wasnt a good day. So check your belt alignments, mower deck bolts, spring placement, rear end bolts, etc. Good Luck!!

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Belt. came off... pulling up blade engagement knob nothing seems to happen.....I have trackter up on blocks with blade cutting height at 1 with engine runnig the blade engagement knob switch ...


sounds like a bad PTO, that is the electrical gizmo on the bottom of the engine's driveshaft which engages the bottom pulley, running the deck. you might luck out and find the fuse is blown so follow the wire from the PTO back until you find the fat part in the wire. the fat part is an in line fuse holder with a fuse in it. if the fuse is bad and blows again, you need a new PTO

Aug 19, 2011 | Husqvarna Riding Lawn Mower 42 Inch Cut...

1 Answer

I have a Sears Garden Tractor with a 48" mower deck. By working in long, thick grass I broke the mower belt -- not the one that transmits power from the engine, but the belt that sits in a pulley on...


I believe that tensioner pully has to be loosend up and moved.
Here are the instructions for this.
  • Place the deck in the lowest position using the hydraulic piston (if applicable) or the manual cutting-height adjuster.

  • 2

    Remove the deck-to-PTO belt from the PTO by releasing tension on the idler-arm pulley. This is a spring-loaded handle that turns in only one direction by hand and relieves the tension on the belt. Slip the deck-to-PTO belt off the PTO pulley after the tension is relieved.

  • 3

    Remove the deck from underneath the mower or tractor.

  • 4

    Locate any belt stops and loosen them with the ratchet wrench and proper socket. Belt stops are located on the deck and are the small metal brackets that guide and secure the belt to the pulleys so it will not jump off when under heavy use, or stretch from normal wear.

  • 5

    Remove any pulley covers by removing the retaining screws using the ratchet wrench and a socket.

  • 6

    Loosen the idler-pulley retaining bolt (located on the underside of the mower deck) to replace the deck-to-PTO belt. Removing the bolt is not necessary. Loosen the pulley enough to wiggle the belt free from the pulley and remove and replace the belt.

  • 7

    Remove any arbor covers (if applicable) that conceal the arbor pulleys by removing the retaining screws with the ratchet wrench and a socket to replace the mower arbor belt.

  • 8

    Locate the tensioner pulley on the mower arbor belt to replace it. Loosen the tensioner pulley bolt enough to slide it and release tension from the belt. Remove the belt from the arbor pulleys and replace it.

  • 9

    Slide the tensioner pulley back leaving about 1/2-inch of play in the belt and tighten the bolt. Reverse the procedure to put the rest of the mower deck back together and reinstall on the mower or tractor.

  • May 10, 2011 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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    How do you put the drive belt for the hydrostatic drive on?


    You'll be working underneath the mower, so it is helpful to raise the mower chassis up -- at least in back. Use your automobile jack, then put jackstands underneath the chassis to do this. Take off the deck drive belt first by releasing the idler spring(s). Unbolt and remove the "anchor" that keeps the PTO clutch from rotating. Disconnect the electrical wires leading to the PTO. Release the tension on the idler for the hydrostatic drive belt. Now you can thread the new hydrostatic belt over the engine pulley and around both wheel motor pulleys. The idler pulley presses it inward to provide tension. Refasten the idler spring - a pair of channellock pliers works well to hold and pull the spring. Now reinstall the wires and the PTO anchor, then the mower deck belt. Good luck! Please rate my answer if helpful, thanks!

    Jul 02, 2010 | Craftsman 21 HP 42 in. Zero Turn Tractor...

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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.

    The 22HP, 46" mower deck Ranch King Pro has 3 belts:

    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.

    Sep 07, 2009 | Mtd Garden

    1 Answer

    Broken belt


    This is actually pretty simple:

    Remove Pto guard on mower deck

    Stand mower up on back stands

    Pull the friction disc away from the drive disc

    slip new belt in between the friction disc and drive disc pushing all the way through

    release friction disc allowing to come back in contact with drive disc

    loop belt around engine pulley

    let mower back down

    route belt around mower pulley

    loosen guides on idler pulley

    route belt through idler pulley

    with engine off move pto lever to tighten mower belt

    adjust guides on idler pulley allowing 1/8" from belt

    tighten bolt on idler pulley

    release pto tension

    install mower pto guard

    and you should be ready to mow

    Aug 14, 2009 | Garden

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