Kubota U17 Thumb Installation: A Step-by-Step Guide

[MikePhua]

Introduction to the Kubota U17 and Thumb Installation
The Kubota U17 is a versatile mini excavator, widely appreciated for its compact size and impressive digging capabilities. One modification that can greatly enhance the functionality of the U17 is the installation of a hydraulic thumb. A thumb is a valuable attachment that allows the operator to handle materials like logs, rocks, and debris more effectively.
This article provides a detailed step-by-step guide on how to install a thumb on the Kubota U17 mini excavator, ensuring that the machine operates at its full potential.
Why Install a Thumb on the Kubota U17?
The addition of a hydraulic thumb to the Kubota U17 mini excavator improves the machine's versatility by enabling the operator to pick up, manipulate, and hold materials while digging. This is especially useful for lifting irregularly shaped objects or when working in tight spaces where a traditional bucket would be less efficient.
A thumb also allows for better control over debris removal, making it easier to clear work areas and improve productivity. The installation of a hydraulic thumb is often considered a must-have for operators who frequently deal with landscaping, demolition, or utility work.
Tools and Equipment Needed for Installation
Before beginning the installation, ensure that you have the following tools and equipment:

• Hydraulic thumb kit (compatible with the Kubota U17)
  
• Wrenches and sockets
  
• Measuring tape or ruler
  
• Drill with the correct bits (for mounting holes)
  
• Hydraulic hose kit (if not pre-installed with the thumb)
  
• Grease gun
  
• Safety equipment (gloves, goggles, etc.)
  

Step-by-Step Guide to Installing a Hydraulic Thumb
1. Prepare the Kubota U17 Excavator

• Begin by ensuring that the excavator is parked on a level surface and the engine is turned off. For safety, engage the parking brake and remove the key.
  
• Make sure the machine is clean and free from any debris or dirt around the arm and attachment points to ensure a smooth installation process.
  

2. Remove the Bucket

• If your Kubota U17 has a bucket attached, remove it first to allow easier access to the arm and attachment points. Depending on your setup, this may require disconnecting the quick coupler or other mounting hardware.
  

3. Position the Thumb Mounting Brackets

• The thumb mounting brackets should be positioned at the end of the boom arm, where the bucket would normally be attached.
  
• Align the mounting brackets with the existing pin holes. Use a measuring tape to ensure the correct placement, ensuring that the thumb is aligned straight and will function properly.
  
• Mark the locations for the new holes, then drill through the marked areas on the boom arm. Make sure to use the proper drill bit size for the thumb attachment pins.
  

4. Attach the Thumb to the Mounting Brackets

• Once the mounting brackets are securely in place, position the hydraulic thumb on the bracket and insert the pins through the holes.
  
• Tighten the pins securely using a wrench or socket to ensure that the thumb is firmly attached to the mounting brackets.
  
• Ensure that the thumb moves freely, without any obstruction, and that it’s securely fastened.
  

5. Install the Hydraulic Hoses

• Next, connect the hydraulic hoses to the thumb. This is where the thumb gets its hydraulic power, allowing it to open and close.
  
• Depending on the thumb kit, you may need to install a set of hoses that are routed to the excavator’s hydraulic system.
  
• Connect the hoses to the thumb cylinder, ensuring that all fittings are tight and secure to avoid leaks.
  
• Attach the other ends of the hoses to the hydraulic ports on the excavator, following the correct schematic for the Kubota U17 model.
  

6. Test the Hydraulic System

• Once the thumb is securely installed and all hydraulic hoses are connected, it’s time to test the system.
  
• Start the engine of the Kubota U17 and engage the hydraulic system. Slowly operate the controls to check that the thumb moves as expected.
  
• Ensure that the thumb opens and closes smoothly without any resistance. If there’s any issue, check the hydraulic hoses for leaks or kinks, and ensure the pins are tightened properly.
  

7. Final Adjustments

• Once you’ve confirmed that the thumb is functioning correctly, make any necessary adjustments. You may want to adjust the thumb’s travel limits or positioning to make it more effective for your specific tasks.
  
• Grease the thumb’s moving parts to reduce wear and keep the system lubricated for longer-lasting performance.
  

8. Reinstall the Bucket

• If you had removed the bucket earlier, now is the time to reinstall it. Ensure that it’s properly aligned and secured before use.
  

Benefits of Using a Hydraulic Thumb on the Kubota U17

• Increased Productivity: The thumb attachment allows the operator to pick up and move materials with greater ease, reducing the need for extra handling or equipment.
  
• Improved Precision: With better control over materials, the thumb allows for more accurate work, especially in situations where a regular bucket would struggle.
  
• Versatility: The hydraulic thumb opens up additional job opportunities, including debris handling, log lifting, and rock manipulation.
  
• Reduced Labor: Handling materials manually or with a separate machine is time-consuming. A thumb reduces the manual labor required, saving both time and effort.
  

Conclusion
Installing a hydraulic thumb on your Kubota U17 mini excavator can greatly enhance its performance and versatility. By following the steps outlined in this article, you can successfully install the thumb and improve the machine's efficiency for various tasks. Regular maintenance, including greasing and checking hydraulic lines, will ensure that the thumb continues to work smoothly, adding value to your machine for years to come.