Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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Have a Craftsman DYT400 42" 3 years old tractor....the blade drive belt got chewed up and broke (was not worn out) I didn't see what caused so I just replaced it, an hour later it did it again. What could be causing this, everything looks to be fine under there.

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I would be looking at one of the idler pulleys to see if there is one bent, a bearing seized up or a flat spot warn out from not turning without resistance.

Posted on May 31, 2010

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Posted on Jan 02, 2017

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Why does my blade drive belt on my riding mower not stay tight


You likely have a bearing going bad causing the belt to slip and wear out, or you are not getting the adjustment tight enough. (most use springs these days)

May 15, 2014 | Craftsman Garden

1 Answer

Changing auger belt on snow blower


The most common cause of this is the drive belt is worn. If you remove the cover (usually plastic) in the middle of the snow thrower and look at the belts.
Your operator's manual will show you how to remove the cover and check/change the belts.
I am going to assume you have a Craftsman snow blower. If you don't have a copy you can get the manual through managemyhome.com
You will need the model number off the snowblower. It is usually located on the bottom right hand corner of the frame (from the handle side)
The model number looks like 247.123456.
The belt closest to the blower assembly drive the auger/blower and the belt closest to the engine drive the transmission.
With the engine not running, have someone depress the drive lever and check the belt.
You should only be able to depress the long side 1/2 inch or less. More than that the belt has stretched and needs to be replaced.
On some older blowers you can adjust the tension pulley, but most made in the last 15 years, you can't.
The belt may be frayed on the edges or glazed causing it to slip (it is shiny on the sides of the belt) It may be torn and broke completely.
Your Craftsman manual will show you step by step how to change th belt.
You can get parts for you Craftsman and most MTD made models through searspartsdirect.com. With other makes you can get parts through jackssmallengines.com
If you are unfamiliar with repairing machines you can get your snow blower repaired by taking it to your local Sears.
They will have a technician troubleshoot and repair the unit.
Feel free to ask any other questions. I know Snow Blowers. Please remember to rate this answer!

Jan 13, 2011 | Craftsman 16" High Garden Tractor Snow and...

2 Answers

My craftsman hydrostatic transmission dont want to go up hills what could the problem be


This symptom is cause most often by the following.

Worn and slipping drive belt which is separate from the blade/deck drive belt.(replace the belt).
by-pass lever (rod) not fully engaged (push it all the way in)
travel pedal or linkage is faulty or out of adjustment ( take to dealer)
Transaxle is faulty (take to dealer)

Jul 18, 2010 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

2 Answers

Tractor belt slips so blade doesn't cut


There is an electrical clutch that drives the belts. This clutch may be worn. Some will have adjustments that will allow it to tighten them up and not slip. Now when your tractor is running and you turn on your blades there is power sent to this clutch, it is mounted on the engine shaft and has flexible metal plate that is pulled into a pulley buy an electro magnet this plate is worn or could be full of grass/dirt. You need a good strong light, with the tractor OFF, get under and look at this clutch, look for grass/dirt or if the metal has changed colors meaning it has gotten very hot. If it has gotten very hot it is time for a new clutch... Sorry if this is the case. Good hunting.

May 22, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Is it possible for the belt to stretch out so much that it won't engage the blades. It worked last year and now it doesn't. I have looked at all the obvious possible problems and it appears that none of...


your belts will stretch out and only have a life span of 1 or 2 seasons. There should be nearly no slack once the blades are engaged. Make sure it didn't slip off any of the pullys and the belt tensionor is on correctly. Check belt for cracking or fray makrs on edges as these are clear signs of a worn belt.

May 11, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

How do I adjust blade drive belt tension on Craftsman G4000 riding mower/tractor?


Belt was excessively worn and after replacement and adjustments made all ran well. Thnaks.

Sep 02, 2009 | Craftsman Garden

1 Answer

Mower squeeking - mowing as usual, and it's squeeking, checked oil, it has oil in it, what else should I check, mower 1 year old, I've done minimal maintenance on it. and can't find my owners manual.


Does it squeek when at an idle, or when driving, or cutting? Does it cut fine? I would check the belts and pulleys and blades for extra play. I had a mandrel bearing go bad on my ys4500 (also about a year old) and the first symptom was a squeeling sound when the blades were enguaged. Play in the mandrel caused the belt to squeek at the pulley that turns the blade. It also cut some nice gouges in my yard due to a floppy blade. I hope that this helps, I got the answers to my problem here on fixya.com.

I believe that one can find a downloadable .pdf version of the owners manual with a quick google search.

good luck

Jul 12, 2009 | Craftsman 21 Hp 42" Deck, Ys 4500 Lawn...

1 Answer

LTX 1000 CRAFTSMAN /42 IN. DECK BELT LODGED ABOVE PULLEY AND STOPPED MOWER AND BROKE BELT. IS THE BELT SIZE 96 OR 97 INCH? THE BELT HAS DONE IT TWICE/STCK BETWEEN THE PULLEY AND THE THING ABOVE IT.


Without the model number, I couldn't tell you what belt goes on the ground drive. That 174883 is a 5/8 x 97" and is your deck drive belt. Your ground drive belt may just need replacing. They will wear thin and loosen up between the pulleys and cause the problems you're having. The old belt may still have the numbers on it.

Jul 04, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

My Sears 917.272911 Lawn Tractor is eating mower drive belts. The belt is being worn out in minutes on the flat idler pulley side. When I put the old belt back everything seems to work fine. The new belts...


There's a couple of things that could be causing this. First, make sure the idler pulleys and blade pulleys spin freely. Second make sure the belt is behind the belt keepers on the two idler pulleys. There is only one on the left idler, but TWO on the right idler. I suspect that is your problem. Anyway, once the belt is on, engage the blades, with engine OFF, and inspect the belt routing, making sure it's not over or under something it shouldn't be.

Jul 02, 2009 | Craftsman 20 hp 42 in. Deck Yard Tractor

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