Question about Troy Bilt 5.5hp Self Propelled Mower

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12a-562q711 replaced the belt but transmission does not engage. Belt turns but do does not turn the transmission. I have replace the Belt tension spring also. should the cable be replace or is it the transmission?

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Based on your description, it really sounds like a transmission problem. I would check the linkage between the engage bar and the transmission to be sure that it has not come loose and there is not engaging. if the linkage is intact and when you grip it to engage it and the belt still turns then the problem would appear to be internal to the transmission. If the mower is still under warranty, I'd take it to an authorized repair shop and have them fix it. If it's out of warranty, you have nothing to lose by taking the transmission apart to see if it is something you can repair such as a loose gear that can be tightened with a set screw or something simple like that. If you find a stripped gear, it still may be fixable with a part order from the manufacturer. Or, you can simply replace the whole transmission but that won't be a cheap or quick fix.

Before making a final decision on any of this, it also might be well worth you while to contact Troybilt to see what they advise. In fact, you probably would have been a bit wiser to have contacted them before posting here because it's extremely difficult to diagnose a problem without having a "hands-on" look at the machine, itself.

I am not a mechanic but I'm an experienced do-it-yourselfer and I was able, years ago, to repair the transmission on a John Deere riding lawnmower, first by replacing a stripped gear and then a few months later replacing the entire transmission. I did not find either job terribly difficult but I had nothing to lose because I bought the mower used for very little money so I had some tinkering room.

After replacing the transmission I was able to sell the mower for enough to cover its original cost and the cost of the parts. Obviously, I did not recover the cost of my time or the frustration of dealing with a bad machine from the start.

Posted on May 14, 2014

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If you have taken all the slack out of the cable to engage the trans, then it very well may be the trans..I do not believe it is the spring.But the springs are cheaper than the trans. First: make sure it is the correct size belt. 2nd The cable is shifting the lever the full distance (Kind of like making the shifter go into 1st gear on a car) If it does not move fully ,it will not engage. Best of luck. One more thing to test, When you have it ready to go Cable is pulled back..pull on the cable to see if there is any slack...if it starts to move ,you found your problem.

Posted on May 15, 2014

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