How to Change the Drive Belt on a Craftsman Riding Lawn Mower

One summer, I found myself halfway through mowing the lawn when the mower suddenly stopped moving. The engine was fine, but the blades weren’t turning. After some head-scratching and checking under the mower, it was clear—the drive belt had snapped. If you’ve ever faced a similar situation, you know how frustrating it can be. But don’t worry, changing the drive belt on a Craftsman riding lawn mower isn’t as daunting as it sounds, and with a little guidance, you can get back to mowing in no time.

Keep your kids safe online with SentryPC – Monitor, filter, and control their computer use anytime, anywhere! Get started today

Here’s a step-by-step guide to help you replace the drive belt on your Craftsman riding lawn mower.


Tools and Supplies You’ll Need

Before diving in, make sure you have everything you need:

  • Replacement drive belt (check your mower’s model for the correct size)
  • Socket wrench set
  • Screwdriver (flathead and Phillips)
  • Work gloves
  • Needle-nose pliers (optional)
  • Jack or mower lift (optional but helpful)

Step-by-Step Instructions

1. Prepare the Mower

  • Park on a flat surface: Ensure your mower is on a stable, level surface. Engage the parking brake and turn off the ignition.
  • Disconnect the spark plug: Safety first! Remove the spark plug to prevent any accidental starts while you’re working on the mower.

2. Lower the Deck

The mower deck (the part that holds the blades) needs to be lowered to access the drive belt.

  • Adjust the deck height lever: Lower the deck to its lowest setting.
  • Remove the deck pins: Look for the deck mounting pins on both sides of the mower. Use your pliers to pull out the pins, then slide the deck out from under the mower.

3. Remove the Belt Covers

  • Look for the belt guards or covers near the engine pulley and around the mower deck.
  • Use a screwdriver or wrench to remove the screws or bolts securing the guards, exposing the old drive belt.

4. Release Tension on the Belt

Most Craftsman riding mowers have a belt tensioner pulley that keeps the belt taut. You’ll need to release the tension to remove the old belt.

Protect your relationship and your online world with SentryPC – Monitor and control internet activities discreetly. Try it now!

  • Locate the tensioner pulley: Usually near the engine or around the deck area.
  • Use a wrench to rotate the pulley, loosening the belt enough to slip it off the pulleys.

5. Remove the Old Belt

  • With the tension released, carefully slide the belt off the engine pulley, deck pulleys, and drive pulley. It’s a good idea to take note of the belt’s routing before removing it. You can even snap a photo for reference later.

6. Install the New Belt

  • Take your new drive belt and route it around the pulleys exactly as the old one was positioned. Start by wrapping it around the engine pulley, then move to the deck and drive pulleys.
  • Make sure the belt is seated properly in all the pulley grooves to avoid slipping or misalignment later.

7. Reapply Belt Tension

  • Use your wrench to rotate the tensioner pulley again, creating slack to fit the belt snugly onto the pulleys.
  • Once the belt is in place, slowly release the tensioner pulley, ensuring the belt is tight but not overstretched.

8. Reattach Belt Guards and Deck

  • Reinstall the belt covers using your screwdriver or socket wrench, ensuring the belt is secure and protected.
  • Slide the mower deck back under the machine and reinsert the mounting pins to attach it back to the mower.

9. Test the Mower

  • Reconnect the spark plug and turn the ignition on.
  • Engage the drive lever or blades to test if the new belt is working correctly. The mower should move smoothly, and the blades should engage without issue.

Common Issues to Watch Out For

  • Belt Slipping or Coming Off: This usually happens if the belt is routed incorrectly or the tensioner pulley isn’t doing its job. Double-check the routing and ensure the tension is correct.
  • No Movement After Belt Replacement: If the mower still doesn’t move after replacing the belt, inspect the drive pulleys and tensioner for damage. A worn or seized pulley can cause issues even with a new belt.

Maintenance Tips to Prolong the Life of Your Drive Belt

  • Regular Inspections: Periodically check your drive belt for cracks, fraying, or wear. Catching issues early can prevent breakdowns during mowing season.
  • Proper Belt Tension: Ensure the belt is neither too tight nor too loose. Incorrect tension can cause premature wear or slipping.
  • Clean the Mower Deck: Debris and grass buildup can cause the pulleys and belts to wear down faster. Clean the deck after each use.

Final Thoughts

Changing the drive belt on a Craftsman riding lawn mower is a task you can easily accomplish with the right tools and a bit of patience. It’s one of those jobs that might seem intimidating at first but becomes second nature once you’ve done it. Just remember to take safety precautions, follow the steps methodically, and you’ll have your mower running smoothly again in no time.

Leave a Comment