Replacing the Center Pivot Seal on a Kobelco ED195 Blade Runner Requires Careful Disassembly of the Swivel Joint Assembly

[MikePhua]

Kobelco ED195 Blade Runner Overview
The Kobelco ED195 Blade Runner is a hybrid machine that combines the digging capabilities of a full-size excavator with the grading precision of a dozer blade. Designed for versatility in site preparation, road building, and forestry work, the ED195 features a six-way dozer blade mounted to a center pivot assembly beneath the cab. This pivot allows the blade to tilt and angle hydraulically, giving operators the ability to shape terrain with precision.
Kobelco Construction Machinery, founded in Japan in 1930, has built a reputation for hydraulic efficiency and structural durability. The ED195 was introduced in the early 2000s and quickly gained popularity in North America for its dual-function design. With an operating weight of approximately 43,000 pounds and powered by a 143-horsepower engine, the ED195 delivers strong breakout force and smooth blade control.
Center Pivot Seal Function and Failure Symptoms
The center pivot seal is a critical component that prevents hydraulic fluid from leaking out of the swivel joint that controls blade movement. Over time, this seal can degrade due to:

• Abrasive contamination from dust and debris
  
• Hydraulic pressure cycling during blade articulation
  
• Thermal expansion and contraction from operating in extreme temperatures
  

When the seal fails, operators may notice:

• Hydraulic fluid leaking from the pivot housing
  
• Reduced blade responsiveness or drift
  
• Visible wetness or staining around the pivot joint
  
• Increased need to top off hydraulic fluid
  

Disassembly and Seal Replacement Strategy
Unlike the more common Kobelco 210 series, the ED195’s center pivot assembly is uniquely engineered. The seal is embedded within a conventional swivel joint, which requires partial disassembly of the blade mount and hydraulic lines.
Steps for accessing and replacing the seal:

• Secure the blade in a neutral position using blocks or stands to prevent movement
  
• Disconnect hydraulic lines feeding the blade tilt and angle cylinders
  
• Remove the pivot housing bolts and carefully lift the upper blade mount
  
• Inspect the swivel joint for scoring or wear before removing the seal
  
• Extract the old seal using a seal puller or hook tool, taking care not to damage the bore
  
• Clean the housing thoroughly and install the new seal with hydraulic grease
  
• Reassemble the joint and torque bolts to factory specification
  
• Bleed the hydraulic system to remove air and restore full blade control
  

It’s recommended to replace all O-rings and backup rings during this process to avoid future leaks.
Parts Availability and Technical Support Challenges
One of the difficulties in servicing the ED195 is the limited availability of technical literature. Kobelco’s documentation for this model is sparse, and many dealers lack detailed service manuals for the center pivot assembly. In such cases, technicians often rely on experience with similar models or reach out to independent hydraulic shops.
Some operators have found success by referencing marine swivel joints or forestry equipment with similar blade articulation systems. While not identical, these analogs offer clues about seal dimensions and installation techniques.
Preventive Maintenance and Long-Term Reliability
To extend the life of the center pivot seal:

• Flush hydraulic fluid annually to remove contaminants
  
• Inspect the pivot joint monthly for signs of wear or leakage
  
• Use high-quality seals rated for dynamic hydraulic applications
  
• Avoid overloading the blade during grading, which increases pressure on the pivot
  
• Keep the joint clean by washing down after muddy or dusty operations
  

Conclusion
Replacing the center pivot seal on a Kobelco ED195 Blade Runner is a specialized task that demands careful disassembly and attention to hydraulic integrity. While technical documentation may be limited, understanding the swivel joint’s function and using proven seal replacement techniques can restore full blade performance. For operators who rely on the ED195’s dual capabilities, maintaining the center pivot is essential to preserving the machine’s unique value on the job site.