Replacing Hydraulic Hoses on the Extendahoe of a Case 580C Backhoe

[MikePhua]

The Case 580C and Its Extendahoe Configuration
The Case 580C backhoe loader, introduced in the late 1970s, was a pivotal model in Case’s evolution of utility machines. With a reputation for reliability and mechanical simplicity, the 580C became a staple in municipal fleets, construction sites, and agricultural operations. One of its most versatile features was the Extendahoe—a telescoping dipper stick that allowed operators to reach deeper trenches without repositioning the machine.
The Extendahoe added hydraulic complexity, requiring additional hoses routed through the boom and dipper arm. These hoses are subject to wear from flexing, abrasion, and exposure to debris. Replacing them is a necessary but often challenging task, especially when access is limited and components are tightly nested.
Terminology annotation:
- Extendahoe: A telescoping extension of the backhoe’s dipper stick, increasing reach and dig depth.
- Hydraulic Hose: A flexible conduit that carries pressurized fluid to actuators and cylinders.
- Boom Section: The primary arm of the backhoe, connected to the dipper and bucket.
- Dipper Stick: The secondary arm that connects the boom to the bucket; houses the Extendahoe mechanism.
Accessing the Hose Routing Inside the Boom
Replacing hoses on the Extendahoe requires partial disassembly of the boom and dipper stick. In most cases, the Extendahoe must be extended fully to expose the hose ends and fittings. Some operators use a second machine to assist in holding or manipulating the boom during disassembly.
Access strategy:

• Extend the dipper fully to expose internal hose routing
  
• Remove retaining pins and guards to access hose clamps
  
• Use a second backhoe or crane to support the boom if needed
  
• Label hose ends before removal to ensure correct reinstallation
  
• Inspect wear pads and guide rollers during disassembly
  

One technician reported using a second backhoe to stabilize the boom while removing the Extendahoe section. This allowed safe access to the hose fittings without risking collapse or misalignment.
Removing and Replacing the Hydraulic Hoses
Once access is gained, the hoses can be removed using standard hydraulic wrenches. It’s important to note that the hoses may be routed through tight channels or brackets, requiring careful maneuvering to avoid damage.
Replacement steps:

• Drain hydraulic fluid from the system to prevent spills
  
• Disconnect hoses at both ends and remove clamps or brackets
  
• Pull hoses through the boom using a fish tape or guide wire
  
• Install new hoses with abrasion sleeves or spiral wrap
  
• Torque fittings to manufacturer specifications
  
• Refill and bleed the hydraulic system after installation
  

It’s recommended to use OEM-spec hoses or high-quality aftermarket replacements rated for at least 3,000 psi. Avoid routing hoses near sharp edges or pinch points, and secure them with rubber-lined clamps to reduce vibration wear.
Preventative Maintenance and Hose Longevity
To extend the life of Extendahoe hoses:

• Inspect hose routing every 250 hours for signs of wear
  
• Clean debris from boom channels to prevent abrasion
  
• Replace hoses every 2,000 hours or during major service intervals
  
• Use UV-resistant hose sheathing for machines stored outdoors
  
• Keep a log of hose part numbers and installation dates
  

In one fleet, implementing a quarterly inspection protocol reduced hose failures by 60% and extended average hose life by over 1,200 hours.
Field Repair Tips and Emergency Solutions
If a hose fails in the field and full disassembly isn’t possible, temporary repairs may be needed to move the machine or complete a job.
Emergency options:

• Use hydraulic hose repair kits with reusable fittings
  
• Install a bypass loop to isolate the Extendahoe function
  
• Cap off leaking lines and operate in limited mode
  
• Transport the machine to a shop using a trailer or tow rig
  

One operator used a reusable fitting kit to splice a ruptured hose and complete a trenching job before scheduling full replacement. While not ideal, this solution prevented downtime and avoided towing costs.
Conclusion
Replacing hydraulic hoses on the Extendahoe of a Case 580C is a labor-intensive but manageable task with the right preparation and tools. By extending the boom, supporting the structure safely, and carefully routing new hoses, operators can restore full functionality and prevent future failures. In machines built for digging deep and working hard, the Extendahoe is a vital asset—and keeping its hydraulic system in top shape ensures it stays that way.