Question about Cub Cadet 46" Lawnmower Deck Drive Belt 754 04153

2 Answers

Deck drive belt keeps coming off and/of breaking after mowing for 5 to 10 minutes.

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  • hahnfamily Aug 31, 2010

    I got a new belt and put it on accordding to the diagram. It broke after 10 minutes of use.

  • mikeProllins May 30, 2012

    The Cub Cadet mowers are notorious for poorly designed belt-deck configurations. The Idler Pulley Brackets are inadequately supported with springs leading to excessive vibration combined with a misalignment of the pulleys will lead to eventually the belt popping off of the deck and/or being cut by the pulleys themselves. Solution to this problem for the LT1045 and other similar models can be viewed at:



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You either have a bad or loose pulley, a stretched belt or a tensioner that isn't working right.

Please post your feedback and Vote if the problem resolved as per your satisfaction.

Posted on Aug 31, 2010

  • Monika Arora
    Monika Arora Aug 31, 2010


    You can try this...

    There are a variety of reasons why a mower belt may come off. Below are some basic steps that may be of assistance. As always, you can contact your local John Deere dealer for assistance.

    Before doing any checks, be sure the engine is off. Remove the key to prevent accidental starting.

    The first thing to check is the mower mounting system. Raise the deck to its number 4 position. If there are any parts missing the deck will not hang evenly. Look at the rear hangers and make sure the clip pins are in place on both sides. Verify that the front draft rod that connects the front of the mower to the tractor’s front axle is connected.

    Next, look at the condition of the entire mower belt. Remove the belt, if it isn’t already off. See your Operator's Manual for help with belt removal. If the belt is badly frayed, or there are sections of the V missing, the belt will have to be replaced.

    Now look at the drive pulleys. It will be necessary to remove the plastic cover to get to the pulley on the left side spindle. Check for foreign objects, like sticks or acorns, stuck in the V. Look for bent or distorted pulley edges. Damaged pulleys will have to be replaced to ensure good belt life.

    Check the idler pulleys. Idler pulleys have a ball bearing in the center. The bearing should turn smoothly. A small amount of play in the bearings is acceptable. You should be just barely feeling a slight movement, if there is any play at all. Excessive play indicates replacement is necessary.

    Find the movable idler arm on the top of the mower deck. On the 42-inch deck, it is connected to the blade engagement cable. The 48-inch deck has a large spring connected to the arm. Check for grass clippings or other foreign material under or behind the arm that may be limiting its travel. Move the arm by hand. The arm should pivot freely against the spring tension. If the arm seems stuck, try spraying the pivot point with a spray lubricant and try moving the arm again. If the arm still doesn’t move, remove the bolt and nut holding the arm to the deck and sand off any rust found on the pivot bolt and the inside of the idler arm with fine sandpaper.

    Now check the mower blade spindles. The 42-inch deck has a brake system that locks the spindles when the PTO lever is in the off position. If you have a 42-inch deck, turn the PTO lever on for this next check. With the belt still off, turn each of the blade spindle pulleys by hand. They should turn smoothly. Then grab the nut on the top of the shaft and try to move the shaft left or right to check for bearing play. You shouldn’t be able to feel any play in the shaft. If the shaft wiggles, see your John Deere dealer for service.

    Finally, measure the pitch or rake of the mower deck. The deck is designed so it cuts best with the blades 1/8 inch to 1/4 inch lower in the front than in the rear. This is sometimes called pitch or rake and is measured at the tips of the blades with the blades pointed straight forward. Excessive rake can cause misalignment of the belt and make the belt come off. See your Operator’s Manual for deck leveling procedures.


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The reason why its comming out is because it become bigger in size and gets loose and comes out. Please get a new one and replace it as mentioned in the bellow article:

Let us know if you have something more to ask else please accept the solution.
Thanks for contacting

Posted on Aug 30, 2010


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Posted on Jan 02, 2017

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1 Answer

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Taking it back into a shop for repairs will not work, the belt will just come off again the first time you mow. I am making a YouTube Video to help others like me with this mower issue and will post a link here soon showing how to fix this design flaw.

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