Skid Steer Will Not Move - 2003 John Deere 260 Series 2

[MikePhua]

Problem Description
A common issue encountered with the 2003 John Deere 260 Series 2 skid steer loader is that the machine starts fine and the bucket operates normally, but the skid steer itself refuses to move. Despite the parking brake disengaging and the indicator light turning off, the machine remains immobile.
Potential Causes

• Hydraulic System Issues: The hydraulic pump might have internal leakage or diminished pressure, reducing drive power. This can be caused by wear in pump components such as seals or pistons.
  
• Drive Motor Problems: The final drive motors may suffer from internal faults or damage, preventing transfer of hydraulic power to the tracks or wheels.
  
• Parking Brake Valve or Solenoid Faults: Even if the parking brake light is off, a malfunctioning brake valve or solenoid could cause the brakes to remain engaged partially.
  
• Control Valve Malfunction: The main control valve responsible for directing hydraulic flow to drive systems could be stuck or malfunctioning, blocking power delivery.
  
• Electrical Wiring or Sensor Errors: Faults in wiring or safety interlocks such as seat switches or control levers can inhibit machine movement. Electrical continuity and signal testing is needed to eliminate this possibility.
  

Diagnostic Approach

• Check hydraulic fluid levels and cleanliness. Low or contaminated fluid can affect pump performance.
  
• Conduct pressure tests on hydraulic pump output and drive motor inputs to verify operational hydraulic pressures.
  
• Inspect parking brake system hydraulics and solenoid operation, confirming complete brake release.
  
• Review electrical connections and sensors related to movement safety interlocks.
  
• Consult the service manual troubleshooting flowcharts for John Deere 260 Series 2 to systematically isolate the major components responsible for movement.
  

Maintenance and Prevention

• Regularly change hydraulic fluid and filters to prevent contamination and premature wear.
  
• Maintain hydraulic pump and motor seals with timely replacements per manufacturer recommendations.
  
• Keep electrical connectors clean and protected to avoid intermittent failures.
  
• Schedule periodic inspections of drive motors and brake components to detect early signs of malfunction.
  

Glossary

• Hydraulic Pump: Device converting engine power to hydraulic fluid flow for machine movement.
  
• Drive Motor: Hydraulic motor converting fluid pressure back to mechanical motion at the wheels or tracks.
  
• Parking Brake Solenoid: Electrically controlled valve actuating parking brake hydraulic pressure.
  
• Control Valve: Valve directing and regulating hydraulic fluid flow for machine functions.
  
• Safety Interlock: Systems preventing unintended machine operation for operator safety.
  

Summary
When a 2003 John Deere 260 Series 2 skid steer will not move despite normal engine start and bucket operation, the root cause often lies in hydraulic or brake system malfunctions. Systematic inspection of hydraulic pressures, pump and motor conditions, parking brake components, and relevant safety interlocks is essential. Timely maintenance and component replacement help reduce breakdowns and ensure the skid steer remains responsive and safe on the job site.