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The newly purchased deck belt turning the blades is extremely loose

How do you tighten the deck belts of a MTD Yard Bug

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  • Dwain Pippen May 11, 2010

    What is the model # undern the seat?

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If idler is in tact and spring attached, it is likely that the belt isn't routed properly. If you try to route the rear-most portion of the belt around the idler, it will be loose. You must route the front-most portion of the belt around the center blade pully and then around the idler. Just Google "MTD 46 inch deck diagram" and you will go to a Parts Tree site with the proper diagram showing routing.

Posted on May 26, 2009

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Posted on Jan 02, 2017

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1 Answer

I have a 17.5 HP Yard Machines,8 speed shift on the go, 42'deck. Worked fine last year, The year, blades would not turn, engine pulley burned up the belt. Replaced the belt, did not solve the problem.


take the belt off and be sure the pulleys turn freely. sounds like you mowed through water and they may have some rust on them or the bearings in the spindles are bad. just take the belt off, turn the pulleys and find the one that is bad and repair it.

May 21, 2017 | Mtd Garden

1 Answer

Vibrating 38" deck on MTD yardman mower


Hi, first replace the blade spindle bearings, if you had to hit them to free them up the bearings are shot. Secondly, replace the deck belt. Because you engaged the blades with a siezed bearing the belt will have a worn section where the v will be thinner thus causing the vibration as it passes through the pulleys. Regards Phil.

Jun 19, 2012 | Mtd Garden

1 Answer

Should the deck belt be loose on the puuleys or tight like the drive belt


loose is a subjective term. As long as it is not flopping around or slipping on the pulleys it should be ok. You don't want it so loose it will fly off.

Aug 09, 2011 | Mtd 46" Dozer Blade, Fits All & Yard -...

2 Answers

My MTD riding lawnmower is burning thru the new belts I just purchased.The new belts are 954-0371A which replaces 754-0371A. The old style belt lasted 5 years. Even before engaging the clutch, the belt...


My idea is not about the belts, but is about the deck. If the tensioning mechanism on the deck is getting stuck in an intermittant position than the belt may be just tight enough to turn blades while slipping through the pulleys, this may cause enough friction to start melting your belts. If this is the case you will have to remove your mower deck and see what is preventing the mechanism from functioning properly.

Jul 07, 2011 | MTD LAWN MOWER PART 1909404 BELT

1 Answer

When I lower my yard bug mower deck, the engine dies. It runs fine until I lower the deck. Help!!


when the deck( blade) is engaged it puts a load on the engine. that tells me theire is some type of bolckage to the belt/force of the movement and is keeping the engine of moving freely. check to see if there is any blockage of the blades, or the belt is loose or off track.

Jun 13, 2011 | Mtd Garden

1 Answer

Need a deck belt diagram for MTD 13AL452F120525197-115


I also need a deck belt diagram because a manual didn't come with my 746 SRL yard machine

May 12, 2011 | Mtd 46" Dozer Blade, Fits All & Yard -...

1 Answer

I have very recently purchased a 125/38" MTD. Not sure how old but appears in reasonable condition. I have used it for about total of 4 hours over past two weeks. Today I have a problem... the large...


Hello,
My name is Dane and I am going to help you solve your problem. You said that the "Pulley" is loose when the blades are disengaged. I hope you meant that the belt is loose, because the pulley should never be loose. If it is loose, you should remove the pulley and make sure the KEY inside the center hole is still ok. Sometimes when the pulley gets loose it chews up the KEY and allows the pulley to turn on the crank. If the KEY is ok, just reinstall the pulley and tighten it.
I believe that your belt is probably just stretched and worn. The mower deck belt gets it's tension from lowering the mower deck. the lower the deck the tighter the belt. Just replace the belt. I hope I've helped! Thank you! Dane

Jan 01, 2011 | Mtd Garden

1 Answer

Mtd yard bug model - 198707 riding lawn mower blade belt size?


I dont know the belt size but if you go to mtd belts in Jackssmallengines.com you should find it. Stephen.

Aug 23, 2009 | Mtd 46" Dozer Blade, Fits All & Yard -...

4 Answers

G-110 deck belt keeps jumping off pulleys


check for a broken belt tension er or maybe grass clippings under belt area, check for a broken or loose pulley bearing, even a bent shaft on the deck.

Aug 07, 2009 | Mtd 46" Dozer Blade, Fits All & Yard -...

1 Answer

My Yard Machines MTD blade won't engage. The belt that spins blade is loose when I try to engage deck.


My mtd 20 hp mower, blade will not engage, found a large spring and a small metal piece that came off and I have no Idea where it goes in order to get this blade going again, can some one give me some info Please..

Apr 19, 2009 | Garden

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