Question about Mtd Products Yard Machines 158CC Tiller

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My tiller is a 5 IC Plus (921A-447-401/1Hl98K10001). I'm having problems with the belt slipping and I don't have an operating manual. If a manual is available I would appreciate receiving one. Also, any inforation on how to address the problem would be appreciated. My address is Lester Lewis 1508 Norwood Drive, Lilburn, GA 30047

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SOURCE: MTD series 410 rear tine tiller drive wheels slip

I have the same issue with one I am working on. It appears the keys in the drive shaft are not rotating far enough out on the drive gear side to fully engage in the gear. I have studied and studied this and so far I have been unable to determine why. If I find out I will let you know. I am also trying to figure out what is supposed to pull these keys out of the till engagement gear.

Posted on May 14, 2010


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Tynes are turning but very slowly. It could be the belt slipping but I have no idea how to get to it? HELP

yes penny it is possible the belt is slipping because it has came out of adjustment or it may be to big for your tiller. belts usually last years. look and see if it is wore thinner in spots or if it is extremely loose. if you put it in the till position with the engine turned off of course. the belt should be tight. if it isn't then you may want to adjust it or replace it.

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Please supply make and model and I will provide your manual.

Tillers are belt driven. It sounds like yours are either slipping or broken.

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Assuming you have not already removed them make yourself a detailed sketch of how the belts are routed (your owner's manual should also show how how they go back on). Remove any guards or retainers (that keeps the belts from jumping off the pulleys) and put the new belts on just like the old ones. Reinstall any guards or retainers you removed. I know this may look complicated but if you take your time and figure out which belt does what it is not all that difficult. Hope this helps.

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1 Answer

I have a lazy boy tiller the belt keeps slipping off the tensioner

As your tiller ages and as you use it, the belt stretches. There is also some wear on the inside of the belt. These belts take a beating, by the way. Your tensioner should be spring loaded and should accomodate some stretching.

My suggestion is to tighten the tensioner to match the specifications the manufacturer lists in your owners manual. If you dont have the manaual, tighten it slowly until it stops coming off ... or ... replace the belt.

I hope this helps you.


Sep 22, 2009 | Garden

2 Answers

The tines on my troy built Horse tiller do not grb when tilling. Are the gears in the drive shaft the problem? How do you fix this?

Since there is no grinding noise, if the problem is in the gear box it isn't too severe. There is a slight possibility that a tooth or two has been broken off one of the gears. But it sounds more like you have a worn drive belt. Most of the time when the tines don't grab or they slip it is because the drive belt have become worn in some way. If it is suppose to be a one-half inch wide belt it could have thinned to a three-eight inch allowing the belt to drop further into the pulley than needed, or it may be "sloppy", not tightening enough to operate the tines if it has stretched. The right belt is very important and is an easy fix. I hope this helps.

Jun 17, 2009 | Troy Bilt Tiller/Edger 26cc, Model No....

1 Answer

I have a troy-built rear blade tiller. It starts fine but when the blades hit the ground they stop turning.

Your belt is likely slipping. To adjust the belts, slide the block down that the roller on the forward/reverse lever uses to lock the tiller into forward. Use a 9/16" wrench to loosen the bolt on the backside of the block, then slide the block down a bit and retighten the bolt. If it's not the belt slipping, you've got transmission gear or bearing problems that could be costly to repair. I hope it's the simple adjustment.

Jun 15, 2009 | Troy-Bilt Garden

1 Answer

Changing Drive belt On Troy Built Tiller

You have to remove the engine (4 bolts, no big problem), then remove the bolt in the center of the pulleys, then remove the pulleys. Slip the belt(s) (2 if you have the Super Bronco model) onto the pulleys, re-attach the pulleys with the bolt, re-mount the engine, and you're home free.

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Remove the Belt, take it to an a Auto parts store and buy a smaller one, the replacement engine may not be exactly as the old one was

Apr 18, 2009 | Garden

1 Answer

Belt seems to be slipping

good evening. I would suggest checking the tine bearings as well alignment. I had (have) a 2003 mtd rear tine which blew the entire bearing box for the second time. The times should have little to no flex when push or pulled. Fortunately, MTD came good for the first rebuild even though my warranty had expired...they covered the parts and labour was all mine. If the tines seem properly working, possibly try out this website to get the 100% correct belt....hope this helps.

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The belt is no doubt on right but if the belt is thicker than the old one it will continually grab onto the side of the pulley causing enough friction to move the tiller, this could be kind of dangerous.

I'm sure you were sold the wrong belt, if you still have your old one take it with you when you go to get another belt and don't let the salesman tell you that's the right belt.

Feb 13, 2009 | Garden

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