een replaced several times but the same things happen the the belt breaks. Are there any adjusts needed because just replacing the belt does not work.
Craftsman

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A common cause of belt breakage is excessive grass clippings on the deck. Grass clippings can work their way under pulleys and deck covers, causing series problems. Make sure to clean off your deck after every mower use and follow manufacturer recommendations.
If a belt is not tensioned properly, it will ride too loose or too tight on the pulley. A belt that`s too loose on a pulley will cause slippage, which leads to heat build up from friction. This heat will damage your rubber belts and cause the belts to crack and break.
The PTO (or power take-off) belt is part of a pulley system that operates the blades on your riding lawn mower. It runs off the electric clutch system in your engine.
PTO clutches generally overheat because of improper lubrication/greasing (both too much and too little can cause problems), excessive sideload, or a new installation. Operators are advised to reduce sideload and inspect grease levels first.
There is no specific time length that mower belts need to be replaced. Some belts may last longer than others due to different operating conditions. One thing is for certain though, the more the mower is used, the sooner you will need to consider replacing the mower belt.
A perfectly tight mower belt can rotate without slipping off but not cause the engine to over-exert and overheat. If the belt does not slip off while working and is not producing unfavorable sounds that indicate wearing off of the belt, then that is the perfect tightness for it.
Usually there are two belts. One goes around two pulleys, a front pulley under the motor and one on the mower deck.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

How to adjust the mowing deck properly? – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : I use a string level just sit it on deck level front to back

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LT1045 keeps breaking NEW belts after just a short period of mowing.
ANSWER : Have you checked the bearings?

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I need the belt digram for a 50″ craftsman lawn tractor, it has two belts on the deck.. any help?
ANSWER : You need exact model numbers. Go to www.searspartsdirect.com put in your model number and see parts list. Go to the right hand side of page and click on manuals.

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I am trying to replace a belt on the deck mower
ANSWER : If it’s a craftsman. Go to www.searspartsdirect.com and put in your exact model number (which you didn’t list) then when you get to the parts listing, look on the right hand side of the page and see if there is a link to manuals for your model , if so click on that. The manual should show you pictures of your belt.

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New battery for chraftsman mower but it still won’t start
ANSWER : Doesn’t it turn over? If your valves are out adjustment. They don’t release compression.

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I’m having trouble replaceing the motion drive belt on my LT1000 lawn tractor. The mowing deck is off, the old drive belt is off. I can’t get the belt around the transaxle pully. Any suggestions?
ANSWER : Often there is a keeper on the back of the pulley, and the belt must go inside the keeper. Get an inspection mirror up in there to look if necessary. Start by putting the belt on the transaxle pulley, then on the PTO pulley, then on the idler, last have someone sit on the mower and depress the clutch pedal while you put the belt over that pulley.

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Mower deck too low
ANSWER : There are two bolts that raise and lower the deck for adjustment on either side of the mower.

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Craftsman 917.270913 how long is deck belt
ANSWER : 1/2×95″

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