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I have a troy-built model `TB230 self propeled walk behind mower. Mower just stopped propelling itself, no noise gears seem fine. But when I checked belt it was on but it looks like it is just sitting on the groved shaft coming out of crankshaft and not on any pulley, belt also seems loose and I can't find an adjustment for belt. Help.

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There is a problem with some types of belt driven self propelled mowers. One is grass clippings and dirt get clogged in there, dry out and act like plaster. But if yours is clear of debris...then what has probably happened is good old "stretching of the belt" even a tiny bit. And unfortunately all belts stretch eventually. If you do not see a obvious adjustment to increase the pully spacing then take a good look at the cable that you squeeze to make the mower move. Up by that "go" lever there is usually s small screw or an "adjuster nut" to tighten the cable up. (Cables stretch too! just like belts.) you should be able to adjust it at least twice before you'd have to get a new cable or belt. So place the belt back onto its pulleys, then (mower off!) pull the "Go" lever and watch the pulleys move. You'll get the idea immediately. So, if no adjustment at the pulleys, look to the cable adjustment up at the lever area. Let me know.

Posted on May 10, 2010

  • Ed Gore May 10, 2010

    Look at the drive lever's cable up at the lever end. There is usually a
    cable adjuster there. It will be a threaded shaft portion with a nut or
    knurled ring to spin. tighten up that "go lever" cable a bit. Even
    better, if you have visual access to the belt as you squeeze the drive
    lever, then you can see if squeezing that lever moves one of the belt's
    pulleys enough to cause it to tighten it up enough to transfer spin
    motion thru the belt to the other pulley. You see that whole system is
    really a "slip belt clutch" when belt is loose, no forward motion, as
    you squeeze the "go/drive" lever the pulley moves away tightening up the
    belt more and more. The tighter the belt, the less the slippage, the
    faster you go! But the slippage is necessary! ( That's the clutch
    component) If you simply had the belt tight all the time, the mower
    would always go full speed! It would be in full time "run away mode"
    LOL! so watch out. Once you see it in action...you'll get the idea no
    problem!


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