Troubleshooting Two-Speed Travel on the New Holland EC25

[MikePhua]

The EC25 and Its Compact Excavator Lineage
The New Holland EC25 is a compact excavator designed for tight-access jobs, utility trenching, and light demolition. Introduced in the early 2000s, it was part of New Holland’s push to expand its compact equipment offerings, leveraging its partnership with Kobelco and Fiat Group technologies. With an operating weight around 2.5 metric tons and a dig depth of approximately 2.6 meters, the EC25 was built to compete with machines like the Bobcat 325 and Kubota KX41.
New Holland, originally founded in Pennsylvania in 1895, became a global brand through mergers with Ford, Fiat, and CNH Industrial. By the time the EC25 was released, New Holland had sold hundreds of thousands of compact machines worldwide, especially in Europe and North America.
Understanding the Two-Speed Travel System
The EC25 features a two-speed travel system, allowing the operator to switch between low-speed torque for digging and high-speed movement for repositioning. This system is controlled by a solenoid-actuated valve, typically triggered by a switch on the operator’s console or joystick.
Key components include:

• Travel speed selector switch
  
• Two-speed solenoid valve
  
• Hydraulic control module
  
• Wiring harness and relay
  
• Travel motor with dual-speed capability
  

When functioning correctly, pressing the switch energizes the solenoid, shifting the valve to allow higher flow to the travel motor, increasing speed. If the solenoid fails or the signal is interrupted, the machine remains in low-speed mode.
Symptoms of Solenoid or Module Failure
Operators may notice the following issues:

• Machine remains in low-speed travel despite switch activation
  
• High-speed engages only intermittently, often after jarring or vibration
  
• Solenoid clicks but does not actuate the valve
  
• Travel speed changes randomly without input
  

These symptoms suggest a fault in the solenoid coil, wiring, or control module. In some cases, physical jarring of the machine temporarily restores function, indicating a loose connection or failing relay.
A technician in Georgia reported that his EC25 would only enter high-speed mode after bouncing over rough terrain. After inspecting the switch and wiring, he discovered a corroded solenoid connector that lost contact under vibration. Cleaning the terminals and applying dielectric grease resolved the issue.
Diagnostic Strategy and Inspection Tips
To isolate the fault, follow these steps:

• Verify switch function with a multimeter; check for continuity and voltage output
  
• Locate the two-speed solenoid, typically mounted near the travel valve block
  
• Inspect solenoid wiring for abrasion, corrosion, or loose connectors
  
• Test solenoid coil resistance; typical values range from 10–30 ohms
  
• Apply direct 12V power to the solenoid to confirm actuation
  
• Check hydraulic pressure at the travel motor during switch activation
  

If the solenoid actuates with direct power but not via the switch, the issue lies in the control circuit. If the solenoid fails to actuate at all, replacement is likely required.
Replacement and Preventative Measures
When replacing the solenoid:

• Match the part number and voltage rating (usually 12V DC)
  
• Use OEM or high-quality aftermarket components
  
• Clean mounting surfaces and replace O-rings if applicable
  
• Secure wiring with loom and zip ties to prevent vibration damage
  

Preventative steps include:

• Periodic inspection of connectors and harness routing
  
• Applying dielectric grease to exposed terminals
  
• Avoiding high-pressure washing near electrical components
  
• Logging travel speed behavior during routine operation
  

Some operators retrofit LED indicators to confirm solenoid activation, providing visual feedback when switching speeds.
A Story from the Field
In 2022, a landscaping crew in Tennessee relied on an EC25 for grading and trenching. The machine began refusing to enter high-speed travel, slowing job progress. After ruling out the switch and relay, they discovered the solenoid had hairline cracks in its epoxy casing, allowing moisture ingress. Replacing the solenoid restored full function, and they added a rubber boot to shield the new unit from splash and dust.
Conclusion
The two-speed travel system on the New Holland EC25 enhances mobility and efficiency, but relies on a precise interplay of electrical and hydraulic components. When faults arise, a methodical diagnostic approach can restore performance without unnecessary part replacement. With proper inspection, clean wiring, and quality components, the EC25 remains a nimble and reliable partner in compact excavation tasks.