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5 hrspwr front tine tiller shears crank shaft key when fires..upon starting

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Mine does the same thing on a 5 horse brigs the thing is firing backwords i think

Posted on May 23, 2010

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What can cause this is a very worn crank shaft keyway, a loose flywheel nut or a worn out flywheel keyway. These are the only causes for a flywheel key to shear. If the crank shaft keyway is excessively worn there is no amount of flywheel nut tightening that will stop the flywheel key from shearing. The only fix at that point is replacement of the crank shaft. The same thing goes for the flywheel keyway... It is worn out the only remedy is flywheel replacement.

The only other thing that causes flywheel keys to fail is a sudden stoppage of the engine. Most of time this only happens to lawn mowers then the operator hits something like a mini tree stump or a large rock.

Thanks for using FixYa,

Kelly


I have seen both the crankshaft and the flywheel keyways worn to the point that both had to be replaced. In the event that both have failed, the replacement cost with labor if you have it done is a repair shop can be 60 to 70 % of the cost of a new engine.

Posted on May 01, 2010

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My craftsman 5hp tiller hit large rock, tines stopped, loud noise followed and now pull string won't budge. Why?


most tillers are equipped with a shear pin down by the tines. for this reason. if you hit something it will shear the pin and not do damage to your machine. it don't sound like that happened here. make sure the tines are disengaged. if the rope wont pull it may have sheared the flywheel key. there are videos on you tube that will show you how to take off the cover, the flywheel and check to see if this has happened. it may have locked the engine up at the worst scenario.

Mar 30, 2016 | Craftsman Garden

1 Answer

Tiller blades barely turns and you have to hold down forward lever to get them to keep turning


belt worn and too loose, maybe pulley slipping on the shaft, shear bolts or pins broke on tines. worse case sheared key in tranny case for drive gears.

May 02, 2011 | Troy-Bilt Pony Garden Tiller

1 Answer

Tines wont turn when in ground, but they will before they go into dirt


If it's a belt drive motor, you have either worn a bad spot on the belt or sheared a key off a shaft. If its a top motor bottom drive tiller, it will be the clutch where the shaft of the motor goes into the gearbox of the tiller. Let me know if this helps :)

May 14, 2009 | Mtd Garden

1 Answer

Tines don't turn


There is usuall a shear pin on the shaft so that when it hits something serious it will shear off preventing the engine from being ruined. I would look for a shear pin somewhere.

Mar 28, 2009 | Garden

1 Answer

Put it in gear and as soon as it has a load it stops tines and wheels. Has trans grease, and have tried to tighten belt by the two side adjustments but it will not move? It is an older tiller Kohler engine...


It sounds like the key that holds the pulley on the front of the tiller transfer case has sheared into. Carefully remove the belt safety cover so the belts are exposed and start the tiller. With a flashlight look at the pully on the lower shaft and shaft area. Carefully engage the tines and see it they are turning. With a second person visually, from the side, inspect the pulleys to make sure they are turning. Now carefully load the tines and see if the pullies of shaft stop turning. If the shaft stops and the pulleys keep turning then the key on the shaft has sheared off. If both keep turning then you have something that has broken or sheered in the transfer case. This type of inspection is dangerous and needs to be done at a distance with a flashlight so you can see down in the shaft area when standing off to the side while someone loads the tines. It is very difficult to try and see if the shaft is sheered in the pully as is the case without the engine running. The key has friction and it is difficult to turn the tines with the drive engaged to the engine. The only other option is to disassemble the transfer case to see what has gone bad. Please be careful testing it. Good Luck, RAC

Mar 07, 2009 | Troy Bilt Pony 6.5 Hp Rear Tine Tiller

1 Answer

Ryobi ry60514 tines won't turn


there are shear bolts that hold the tines on. they are designed to snap when u hit something big such as a big rock or pipe or something like that. they are designed to snap at so much pounds of pressure so u dont break any gears or gearshafts. a lot of times people dont realize this and put regular screws or bolts in it and run it. when they hit something they ussually snap the gearshaft inside the tiller. i have replaced this on my fathers tiller cause he did the same thing. so either u might need to put new shear bolts in or if u had a regular bolt in u probably snapped a gear shaft or a gear.

Nov 23, 2008 | Ryobi Cultivator

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