42 in. Deck 19.5hp Lawn Tractor

Belt is jumping on the left pulley when engaged.

How to Identify and Fix Common Gardening Problems ?

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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.
x 96-5/8 in. for 42 in. Deck Riding Mowers, Fits Cub Cadet, MTD, John Deere and more (R-75-813)
Look for the belt, which is usually found in the lawn mower deck. Check the pulleys that the mower drive belt rides on. Place your hand on the belt and push the belt down and toward the pulleys. Check on how the belt gives way to your pressure; it should not be loose enough to give way more than a few inches.
The signs of a loose mower deck belt include the mower belt slipping, the belt coming off the pulleys, a stretched belt, excessive vibration of the deck belt, a high pitched noise, rapid signs of wear and tear, and a shiny and glazed belt, among others.
The signs of a loose mower deck belt include the mower belt slipping, the belt coming off the pulleys, a stretched belt, excessive vibration of the deck belt, a high pitched noise, rapid signs of wear and tear, and a shiny and glazed belt, among others.
Tight side and slack side

When belt is running over pulley, the friction creates grip on pulley which creates tension on one side of belt which makes the driven pulley to run, this side is called tight side. The other side does not experience same tension, that side is called slack side.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

How do i install a mulching plug on my craftsman lawn tractor?
ANSWER : It covers the hole on the deck

How to fit new belt – Craftsman 20 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : Ya gotta have model numbers. Go to searspartsdirect.com and enter your model number. Most models then have manuals available over on the right hand side of page. Most manuals have pictures or diagrams on bets.

Need to replace drive belt.Never replaced. 42′ Craftsman riding lawn mower. How difficult is this. How do you access rear drive pully
ANSWER : Take a look at how the belt is installed. Then you will have to remove the mower deck and belt from the pulley on the engine. There is probably something by the engine pulley that you will have to remove so the belt will come off. It might be a shoulder bold or a rod with a bolt holding it on. Same with the rear pulley. Then you just have to put the belt on one pulley and watch your fingers so you don’t pinch them and turn the other pulley and the belt should go on. reinstall any bolts you removed and install the deck.

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

I need the belt diagram for a 42″ craftsman 20.5 hydro tractor
ANSWER : Do a model search on www.partsdirect.com. This is the website for Sears equipment. Just reminder you will need the model number from under the seat to help you find the right model.

Belt diagram for a Craftsman 42″ riding lawn mower
ANSWER : There are as many belt diagrams as there are mowers. You will need your model number to get the correct diagram. You should find this under the seat or on the very back of the unit. sorry can’t help more at this time, when you get this, you can get online and go to sears and you will find it there.

What would cause my craftsman lt 1000 to chew up ground drive belt?
ANSWER : A bad pulley – bent- binding bearing-loose belt guides

Craftsman riding mower lt-1000 leaks gas – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : Need to fix that. it may be a fire hazard.