Kubota U35 Bucket Pin Washers: Maintenance and Replacement Guide

[MikePhua]

The Kubota U35 is a versatile and compact mini-excavator widely used in construction, landscaping, and utility work. Over time, the bucket pin washers—also known as shims—can wear out due to constant friction and stress. Replacing these washers is crucial to maintain the integrity of the bucket linkage and ensure smooth operation.
Understanding Bucket Pin Washers
Bucket pin washers are thin, circular components placed between the bucket and the arm to reduce wear and play in the joint. They act as spacers, maintaining the correct alignment and preventing metal-to-metal contact between the pin and the bucket ears. Without these washers, the pin can wear down more quickly, leading to increased play, reduced efficiency, and potential damage to the bucket and arm.
Identifying the Correct Washer Size
For the Kubota U35, the standard bucket pin washer has the following dimensions:

• Outer Diameter: Approximately 40mm
  
• Inner Diameter: Approximately 20mm
  
• Thickness: Typically 5mm
  

It's essential to verify these dimensions with your specific machine's requirements, as variations can exist based on the model year or modifications.
Sourcing Replacement Washers
Replacement washers can be sourced from various suppliers:

• OEM Parts: Kubota dealerships offer genuine parts that ensure compatibility and quality.
  
• Aftermarket Suppliers: Companies like eBay and Amazon provide compatible washers at competitive prices.
  

When selecting replacement washers, ensure they meet the required specifications and are made from durable materials to withstand the operational stresses.
Installation Tips
Replacing the bucket pin washers involves the following steps:

1. Lift the Bucket: Use the excavator's boom to lift the bucket off the ground.
   
2. Support the Bucket: Place a jack or support under the bucket to hold it in place.
   
3. Remove the Pin: Using appropriate tools, remove the pin securing the bucket to the arm.
   
4. Replace the Washers: Remove the worn washers and replace them with the new ones.
   
5. Reinstall the Pin: Align the pin with the holes and secure it back in place.
   
6. Check for Play: Ensure there is minimal play between the bucket and the arm.
   

Maintenance Recommendations
To prolong the life of the bucket pin washers:

• Regular Inspections: Periodically check for signs of wear or damage.
  
• Proper Lubrication: Apply grease to the pin and washers to reduce friction.
  
• Avoid Overloading: Do not exceed the machine's rated capacity to prevent undue stress on the components.
  

Conclusion
Maintaining the bucket pin washers on your Kubota U35 is vital for the machine's performance and longevity. Regular inspection and timely replacement can prevent more significant issues and ensure smooth operation on the job site. Always consult your machine's manual and consider seeking professional assistance if needed.