Resolving Two-Speed Travel Issues on the Bobcat 325 Mini Excavator

[MikePhua]

Understanding the Bobcat 325 Drive System
The Bobcat 325 is a compact mini excavator introduced in the mid-2000s, designed for tight job sites and light excavation tasks. With an operating weight of approximately 6,000 lbs and a digging depth of over 10 feet, it features a two-speed travel system that allows operators to switch between low torque/high traction and high-speed movement. The two-speed function is controlled via an electric switch—commonly referred to as the “rabbit button”—which activates solenoids mounted on the travel valve bank.
Bobcat, founded in 1947 and now part of the Doosan Group, has sold tens of thousands of mini excavators globally. The 325 model remains popular among landscapers, utility contractors, and rental fleets due to its reliability and ease of maintenance.
Symptoms of Two-Speed Failure
A common issue reported on the Bobcat 325 involves one track—typically the left—not engaging in high-speed mode when the rabbit button is pressed. The right track continues to function normally, switching between low and high speed without issue. The rabbit indicator light remains illuminated, suggesting that the switch itself is working.
This asymmetrical behavior points to a localized fault in the left-side travel circuit, rather than a system-wide failure.
Troubleshooting the Solenoid and Valve Bank
The two-speed function is actuated by electrical solenoids mounted on the travel valve bank, with one solenoid dedicated to each track. These solenoids receive signals from the rabbit switch and control hydraulic flow to the travel motors.
To diagnose the issue:

• Locate the valve bank behind the cab, where the drive control cables terminate. The left-side valve is closer to the rear of the machine.
  
• Inspect the solenoid connections above the cable entry point. Each solenoid has a two-wire electrical connector.
  
• Disconnect and clean the connectors, removing corrosion, dirt, or moisture that may interfere with signal transmission.
  
• Reconnect and test the system by pressing the rabbit button and observing track response.
  

In one successful case, cleaning the solenoid connector restored full two-speed functionality to both tracks. However, if the issue recurs, the solenoid coil may be internally shorted or weak and require replacement.
Electrical vs. Hydraulic Faults
While electrical faults are the most common cause of two-speed failure, mechanical issues should not be ruled out:

• Binding idlers or track rollers can prevent high-speed engagement
  
• Hydraulic contamination may affect valve spool movement
  
• Damaged wiring harnesses near the valve bank can interrupt signal flow
  

Use a multimeter to verify voltage at the solenoid terminals when the rabbit button is pressed. A reading of 12V or 24V (depending on system spec) confirms signal delivery. If voltage is present but the solenoid does not actuate, replacement is recommended.
Preventive Measures and Recommendations

• Apply dielectric grease to solenoid connectors to prevent future corrosion
  
• Secure wiring harnesses with zip ties and protective loom
  
• Test two-speed function weekly, especially in rental or fleet environments
  
• Keep valve bank area clean to reduce electrical interference
  

Conclusion
Two-speed travel issues on the Bobcat 325 are often traced to solenoid connector faults or minor electrical interruptions. With basic tools and careful inspection, operators can restore full functionality without extensive teardown. As compact excavators continue to evolve, understanding the interplay between electrical control and hydraulic actuation remains key to efficient field troubleshooting.