| | |


Welcome to our comprehensive guide on maintaining the heart of your garden’s beauty: the John Deere D105 lawn tractor. Essential to keeping your outdoor spaces pristine, the drive belt of your D105 is a critical component that demands attention. 

It’s the key to transferring power from the engine to the wheels, ensuring your tractor glides smoothly across the lawn, leaving behind a perfectly manicured landscape.


In this feature, we’re zeroing in on how to replace the drive belt, a task that might seem daunting but is crucial for the longevity and efficiency of your lawn tractor. Our aim is to equip you with the knowledge and confidence to tackle this maintenance chore, ensuring your John Deere D105 continues to operate at its peak.

We’ll walk you through every step of the process, from safety measures to the final adjustments, making sure you’re prepared to handle this essential upkeep task. T

his guide isn’t just about maintenance; it’s about empowering you to keep your garden in top condition, ensuring it remains a source of pride and joy.

So, whether you’re an experienced gardener or new to lawn care, this guide has something for you. Let’s dive in and ensure your John Deere D105 stays in perfect shape, ready to take on the challenges of keeping your lawn looking its best.

Key Specifications for the John Deere D105 Drive Belt:

  • Type: The belt is a serpentine belt, designed to engage with the grooves of the pulleys.
  • Material: Made from a durable rubber compound designed to withstand the rigors of extensive use and varying weather conditions.
  • Length and Width: Specific to the D105 model, ensuring it fits the pulley system without being too tight or too loose.

To find the exact specifications, including the part number for the replacement belt, you should consult the John Deere D105’s user manual or the John Deere website. John Deere also provides a parts search function where you can enter your model number (D105) to find the exact replacement belt and its specifications. 

Using the OEM belt is highly recommended to maintain your lawn tractor’s performance and to prevent premature wear or failure.

When purchasing a replacement belt, make sure to:

  • Verify the part number: For the John Deere D105, this information can be found in the user manual or by contacting a John Deere dealer.
  • Purchase from reputable sources: To ensure you’re getting an OEM belt or a suitable aftermarket equivalent that meets the necessary specifications.

Remember, using the correct belt not only extends the life of the belt itself but also protects other mower components from unnecessary wear, keeping your John Deere D105 running smoothly for years to come.


1. Prepare for Safety

  • Turn off the engine and ensure it is cool before starting the replacement.
    • This step is vital to prevent burns or other injuries, as the engine and surrounding components can remain hot for a considerable time after use. Working on a cool engine reduces the risk of injury and makes the process more comfortable.
  • Disconnect the spark plug wire to prevent accidental starting.
    • Removing or disconnecting the spark plug wire is a critical safety measure that ensures the engine cannot start while you’re working on the mower. This step eliminates the risk of the engine accidentally turning over, which can happen if the ignition switch is bumped or if there’s residual electricity in the system.
  • To disconnect the spark plug wire, gently pull the wire’s boot (the covering at the end of the wire) away from the spark plug. It’s advisable to do this with the engine cool to avoid any chance of shock or burns.
  • Wear gloves to protect your hands during the process.
    • Wearing gloves protects your hands from sharp edges and from getting dirty or greasy. It also provides a better grip on tools and mower parts, which can be especially helpful when removing and installing the drive belt.

2. Access the Drive Belt

Position the Mower

  • Choose a flat, level surface: This ensures the tractor remains stable during the operation, reducing the risk of it tipping or rolling.
  • Engage the parking brake: This prevents the tractor from moving while you’re working on it, adding an extra layer of safety.

Remove the Mower Deck

  • Lower the mower deck to its lowest position: Doing so provides easier access to the pins and clips that secure the deck to the tractor. It also makes the next steps simpler and less strenuous.
  • Disconnect the mower deck from the tractor:
    • Remove pins and clips: These are typically located at the front and rear of the mower deck. Removing them allows you to detach the deck from the tractor. Keep these components in a safe place as you’ll need them to reattach the deck later.
  • Disconnect the mower deck lift linkage: This linkage controls the height of the mower deck. Disconnecting it allows you to fully separate the deck from the tractor.
  • Disconnect the PTO (Power Take Off) cable: The PTO cable engages the mower blades. Disconnecting it is crucial for removing the deck and accessing the drive belt.

Slide the Mower Deck Out

  • Once everything is disconnected, carefully slide the mower deck out from under the tractor. This may require a bit of maneuvering, as the deck needs to clear the wheels and any other protruding parts of the tractor.
  • With the deck removed, you’ll have better access to the drive belt and the various pulleys and components it interacts with.

Tips for Success

  • Take photos or notes of the connections and routing before disassembly to aid in reassembly.
  • Keep track of all removed parts (pins, clips, etc.) to ensure nothing is lost and that everything can be properly reconnected.
  • Be prepared for some physical effort, especially when sliding the deck out from under the tractor, as mower decks can be heavy and awkward to handle.

3. Remove the Old Drive Belt

Locate the Drive Belt

  • Identify the drive belt: Take a close look at the routing of the drive belt around the various pulleys and the belt tensioner. The drive belt connects the engine’s crankshaft pulley to the transmission pulley, transferring power to drive the mower.
  • Inspect the belt: Look for signs of wear, damage, or stretching. Note the belt’s routing so you can reinstall the new belt correctly.

Relieve Tension on the Belt

  • Find the tensioner mechanism: Depending on your mower’s model, there may be a tensioner pulley or lever that adjusts the tension on the drive belt.
  • Move the tensioner to slacken the belt: Use the appropriate tool or method to release tension on the drive belt. This may involve rotating the tensioner pulley or moving a lever to loosen the belt. Relieving tension makes it easier to slide the belt off the pulleys.

Remove the Belt

  • Slide the old belt off the pulleys and the tensioner: With the tension released, carefully slide the old belt off the pulleys and the tensioner mechanism. Take note of how the belt is routed around each pulley, as you’ll need to replicate this when installing the new belt.
  • Inspect the pulleys: While the belt is off, take a moment to inspect the pulleys for any signs of damage or wear. Clean any debris or buildup that may be present.

4. Install the New Drive Belt

Check the New Belt

  • Ensure the new drive belt matches the old one in size and type: Before installation, compare the new belt to the old one to ensure they are identical in size, type, and specifications. Using genuine John Deere replacement parts is recommended for optimal performance and longevity.

Route the New Belt

  • Refer to the belt routing diagram: Consult the owner’s manual or look for a sticker under the hood or on the mower deck that provides a belt routing diagram. This diagram illustrates how the new belt should be routed around the various pulleys and the tensioner.
  • Position the new belt around the pulleys and tensioner: Start by placing the belt around the engine’s crankshaft pulley, then route it around the other pulleys according to the diagram. Ensure the belt fits into the grooves on the pulleys correctly to prevent slippage or damage.
  • Verify the routing: Double-check that the new belt is routed exactly as shown in the diagram, with no twists or misalignments.

Adjust the Tension

  • Manual tension adjustment: If your mower model has a manual tension adjustment mechanism, use it to set the correct tension on the new belt. Refer to the manufacturer’s specifications for the recommended tension setting.
  • Follow the manufacturer’s instructions: Some models may have specific procedures for adjusting belt tension. Follow these instructions carefully to ensure the belt is neither too loose nor too tight.
  • Check the tension: After adjusting the tension, ensure the belt has the correct amount of tension. A properly tensioned belt should have a slight amount of deflection when pressed down with moderate pressure.

5. Reassemble and Test


  • Reattach any guards or components removed during belt replacement: Carefully reinstall any guards or components that were removed to access the drive belt. This may include belt guards, covers, or other protective components. Ensure they are securely fastened in place to prevent them from coming loose during operation.

Reinstall the Mower Deck

  • Slide the mower deck back under the tractor: Carefully maneuver the mower deck back into position under the tractor, ensuring it aligns properly with the mounting points.
  • Reconnect the deck: Securely reattach the mower deck to the tractor by inserting the pins and clips at the front and rear of the deck. Also, reconnect any linkages, such as the mower deck lift linkage and the PTO cable, ensuring they are properly engaged.
  • Check for secure attachment: Double-check that all pins, clips, and linkages are securely fastened to prevent the mower deck from coming loose during operation.

Reconnect the Spark Plug Wire

  • Reconnect the spark plug wire: Gently push the spark plug wire boot back onto the spark plug. Ensure it is securely seated to prevent it from coming loose while the engine is running.

Test the Mower

  • Start the engine: Turn the ignition key to start the engine and allow it to idle.
  • Engage the drive: Slowly engage the drive and test the mower’s movement. Ensure it moves smoothly and responds properly to throttle and steering inputs.
  • Check for proper belt tension and alignment: Observe the new drive belt during operation to ensure it maintains proper tension and alignment. Listen for any unusual noises or vibrations that may indicate a problem with the belt installation.
  • Inspect for leaks or loose components: While the engine is running, inspect the area around the drive belt and other components for signs of leaks or loose fasteners. Address any issues immediately to prevent further damage or safety hazards.


When it comes to maintaining your John Deere D105 lawn tractor, replacing the drive belt is a task that, while essential, comes with its set of challenges. To guarantee the longevity and optimal performance of your replacement belt, steering clear of common pitfalls is key. Here’s a rundown of mistakes you’ll want to avoid to ensure your belt replacement goes off without a hitch:

1. Using an Incorrect Belt Size or Type

  • Not all belts are created equal. Using a belt that’s not specifically designed for the John Deere D105 can lead to improper fit, resulting in slippage or excessive wear. Always check the part number and specifications to ensure compatibility.

2. Skipping the Manual

  • The owner’s manual contains essential information, including the correct routing of the drive belt. Ignoring these instructions can lead to incorrect installation, which may damage the belt or mower.

3. Neglecting Pulley and Idler Inspection

  • Replacing the belt without inspecting the pulleys and idler for wear or damage is a missed opportunity for comprehensive maintenance. Damaged components can shorten the new belt’s lifespan and affect mower performance.

4. Improper Belt Routing

  • One of the most common mistakes is incorrect belt routing. This can easily lead to poor performance, increased wear on the belt, and even damage to the mower. Double-check the routing against the diagram in your manual or on the mower.

5. Ignoring Tension Adjustments

  • Proper belt tension is crucial for optimal performance. Too tight, and you risk excessive wear on the belt and bearings; too loose, and the belt may slip. Ensure the belt has the correct tension as per the manual’s guidelines.

6. Forgetting to Check the Deck Leveling

  • After replacing the drive belt, some may overlook checking the mower deck leveling. An uneven deck can lead to an uneven cut and put unnecessary strain on your new belt.

7. Overlooking Safety Precautions

  • Always disconnect the spark plug before performing any maintenance on your lawn tractor. This prevents accidental starts, ensuring your safety during the belt replacement process.

8. Rushing Through the Process

  • Take your time to ensure everything is done correctly. Rushing can lead to mistakes, overlooked steps, or improper installations, which might necessitate redoing the work or even cause damage to the mower.

9. Failing to Clean the Area

  • Before installing the new belt, it’s a good idea to clean the pulleys and the surrounding area. Dirt and debris can cause premature wear on the new belt and decrease overall performance.

By avoiding these common mistakes, you can ensure a successful drive belt replacement on your John Deere D105, extending the life of your mower and maintaining its performance. Remember, patience and attention to detail are your best tools in any maintenance task.

In summary, maintaining the drive belt on a John Deere D105 lawn tractor is essential for ensuring the mower’s efficiency and performance. Regular inspection and replacement of the drive belt as needed can prevent costly repairs and downtime.

 Following manufacturer recommendations, using genuine parts, and prioritizing safety are key aspects of successfully replacing the drive belt. By staying proactive with maintenance and addressing any issues promptly, owners can enjoy reliable operation and prolonged lifespan from their John Deere D105 mower.



Maintaining the drive belt of your John Deere D105 lawn tractor is essential for ensuring the longevity and optimal performance of your machine. Regular and proper maintenance can significantly extend the life of the drive belt, saving you time and money in the long run. Here are several maintenance tips to help you get the most out of your John Deere D105 drive belt:

1. Regular Inspections

  • Conduct periodic inspections of the drive belt for any signs of wear, cracking, fraying, or other damage. Early detection of these issues can prevent belt failure and potential damage to your lawn tractor.

2. Clean the Belt and Pulleys

  • Keep the belt and pulley system clean from debris, grass clippings, and dirt. Build-up can cause the belt to slip or wear prematurely. Use a cloth or brush to gently remove any debris from the belt and pulleys.

3. Check for Proper Tension

  • The drive belt needs to have the correct tension to function effectively. A belt that’s too tight can cause excessive wear, while a belt that’s too loose might slip. Refer to your operator’s manual for guidance on how to check and adjust the belt tension.

4. Ensure Correct Alignment

  • Misalignment of the belt can lead to uneven wear and reduced efficiency. Check the alignment of the pulleys and make sure the belt is seated correctly in the pulley grooves.

5. Replace Worn Pulleys

  • Worn or damaged pulleys can damage your drive belt. Inspect pulleys for wear and replace them as needed to keep the belt running smoothly and to extend its lifespan.

6. Avoid Overloading Your Tractor

  • Pushing your tractor beyond its designed capacity can strain the drive belt. Follow the manufacturer’s recommendations for towing and mowing to avoid putting unnecessary stress on the belt.

7. Use Genuine Replacement Parts

  • When it comes time to replace your drive belt, using genuine John Deere parts can ensure compatibility and reliability. Genuine belts are designed to meet the specific operational requirements of your D105.

8. Proper Storage

  • When not in use, especially for extended periods, store your lawn tractor in a clean, dry place to protect the belt from environmental damage. Extreme temperatures and moisture can degrade the belt material.

9. Follow a Regular Maintenance Schedule

  • Adhere to a regular maintenance schedule as recommended by John Deere. This includes not only the drive belt but also other critical components of your lawn tractor.

By following these maintenance tips, you can significantly extend the life of your John Deere D105 drive belt, ensuring that your lawn tractor remains a valuable and efficient tool for your lawn care needs.


In summary, maintaining the drive belt on a John Deere D105 lawn tractor is essential for ensuring the mower’s efficiency and performance. Regular inspection and replacement of the drive belt as needed can prevent costly repairs and downtime.

Following manufacturer recommendations, using genuine parts, and prioritizing safety are key aspects of successfully replacing the drive belt. By staying proactive with maintenance and addressing any issues promptly, owners can enjoy reliable operation and prolonged lifespan from their John Deere D105 mower.

Here are some frequently asked questions (FAQs) regarding replacing the drive belt on a John Deere D105 lawn tractor:

  1. How often should I replace the drive belt on my John Deere D105?
    • The frequency of drive belt replacement can vary depending on usage and operating conditions. However, it’s generally recommended to inspect the drive belt regularly for signs of wear or damage and replace it as needed. Typically, drive belts may need replacement every 100-200 hours of use or if they show visible signs of wear, such as cracking or fraying.
  1. Can I use aftermarket drive belts instead of genuine John Deere parts?
    • While aftermarket drive belts may be available, it’s recommended to use genuine John Deere replacement parts for optimal performance and longevity. Genuine parts are designed to meet the specific requirements and standards of your mower, ensuring compatibility and reliability.
  1. How do I know if my drive belt needs to be replaced?
    • Signs that your drive belt may need replacement include visible wear, such as cracking, fraying, or stretching, as well as decreased performance, such as slipping or squealing noises during operation. Regular inspection of the drive belt is key to identifying any issues early.
  1. Do I need any special tools to replace the drive belt on my John Deere D105?
    • Basic hand tools such as wrenches, sockets, and pliers are typically sufficient for replacing the drive belt. However, having a belt tension gauge or tool may be helpful for ensuring proper tensioning of the new belt.
  1. Can I replace the drive belt myself, or should I seek professional assistance?
    • With the proper tools and instructions, replacing the drive belt on a John Deere D105 can be done by most homeowners. However, if you’re unsure about any aspect of the process or if you encounter difficulties during installation, it’s advisable to seek professional assistance from a certified technician or John Deere dealer.
  1. How long does it take to replace the drive belt on a John Deere D105?
    • The time required to replace the drive belt can vary depending on factors such as your familiarity with the process, access to tools, and any complications encountered during installation. In general, it may take anywhere from 1 to 3 hours to complete the replacement.
  1. What maintenance tasks should I perform after replacing the drive belt?
    • After replacing the drive belt, it’s a good idea to perform a thorough inspection of the mower, checking for proper tension and alignment of the new belt, as well as any leaks or loose components. Additionally, follow any maintenance recommendations outlined in your mower’s owner’s manual to ensure continued performance and reliability.


  1. https://mechanicsnews.com/john-deere-d105-traction…
  2. https://www.deere.com/…/d100-series/d105

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *