Replacing the Drive Belt on a Case 1737 Uniloader

[MikePhua]

The Case 1737 Uniloader, a vintage skid steer loader produced by Case Corporation, is renowned for its versatility and durability in various construction and agricultural applications. A critical component of its drivetrain is the drive belt, which transmits power from the engine to the hydraulic pumps. Over time, this belt may wear out or become damaged, necessitating replacement.
Identifying the Correct Replacement Belt
The original equipment manufacturer (OEM) part number for the drive belt on the Case 1737 Uniloader is D58998. This belt is a variable-speed V-belt, approximately 1.81 inches wide and 51.7 inches in length. It's essential to use a belt that matches these specifications to ensure proper fit and function. Aftermarket options, such as those from Loader Parts Source, offer compatible replacements for this OEM part.
Tools and Equipment Needed
Before beginning the replacement process, gather the following tools and equipment:

• Wrenches and sockets
  
• Pry bar or large flathead screwdriver
  
• Wooden block (e.g., 2x4)
  
• Replacement drive belt (D58998 or equivalent)
  
• Torque wrench
  

Step-by-Step Guide to Replacing the Drive Belt

1. Preparation: Park the Uniloader on a flat, stable surface and engage the parking brake. Ensure the engine is off and has cooled down to prevent injury.
   
2. Accessing the Drive Belt: Locate the drive belt assembly. This typically involves removing any panels or guards obstructing access to the belt.
   
3. Loosening the Pulley: The drive system utilizes a variable-speed pulley mechanism. To remove the old belt, you may need to loosen the spring retainer nuts on the driven pulley. Using a pry bar, carefully spread the pulley apart and secure it in the open position with a wooden block. This action increases the gap, allowing for belt removal.
   
4. Removing the Old Belt: Once the pulley is sufficiently open, slide the old belt off the pulleys. Inspect the belt for signs of wear or damage, which can provide insights into potential issues with the drive system.
   
5. Installing the New Belt: Position the new belt over the pulleys, ensuring it sits correctly in the grooves. Be cautious not to twist the belt during installation.
   
6. Reassembling the Pulley: Remove the wooden block and allow the pulley to close, securing the new belt in place. Tighten the spring retainer nuts to the manufacturer's specified torque settings.
   
7. Final Checks: Rotate the pulleys by hand to ensure the belt moves freely and is properly aligned. Reinstall any panels or guards that were removed during the process.
   

Maintenance Tips

• Regular Inspections: Periodically check the drive belt for signs of wear, cracking, or glazing. Addressing issues early can prevent more significant problems.
  
• Cleaning: Keep the belt and pulleys clean from debris and contaminants, as these can cause premature wear.
  
• Proper Tension: Ensure the belt maintains the correct tension. Too loose can lead to slippage, while too tight can cause excessive wear on bearings and other components.
  

Conclusion
Replacing the drive belt on a Case 1737 Uniloader is a manageable task for those with basic mechanical skills. By following the outlined steps and utilizing the correct replacement parts, you can restore the loader's performance and extend its operational life. Always refer to the manufacturer's service manual for specific instructions and torque specifications.