Lost Left Side Travel on Volvo 210B Excavator

[MikePhua]

Overview of Volvo 210B
The Volvo 210B is a medium-sized excavator introduced in the early 2000s. Known for its robust hydraulic system and reliable drivetrain, it has been widely used in construction, mining, and land-clearing projects. Volvo’s reputation for durability has contributed to high sales volumes globally, with tens of thousands of units deployed across North America, Europe, and Asia. Its hydraulic system integrates dual travel motors, planetary final drives, and precision control valves to provide smooth, responsive movement.

Symptoms of Lost Travel Function
A common issue reported is the loss of one-side travel, specifically the left track. Operators may notice:

• Complete immobility of the left track while the right track functions normally
  
• No unusual noises from the motor when attempting to drive
  
• Standard control inputs failing to move the track
  

This situation can halt operations, especially on uneven terrain or when maneuvering in tight spaces, reducing productivity significantly.

Initial Inspection Steps
Troubleshooting begins with basic checks:

• Inspect hydraulic fluid levels in the planetary hub; overfilling can cause internal pressure issues that impair motor function
  
• Lift the affected track off the ground to see if it spins freely, comparing to the functioning side
  
• Observe for leaks or damage at the swivel joint where hoses connect the motor to the main hydraulic lines
  

Hydraulic Pressure Testing
If fluid levels are normal and mechanical inspection shows no obvious damage, pressure testing is recommended:

• Test both main hoses supplying the left travel motor, top and bottom ports
  
• Compare pressure readings with the right side to identify discrepancies
  
• Low or inconsistent pressure may indicate internal motor wear, blockages, or valve malfunctions
  

Common Causes
Based on field experience, left-side travel loss often results from:

• Internal wear of the hydraulic travel motor due to high operating hours
  
• Contamination or air in the hydraulic system reducing pressure
  
• Swivel joint malfunctions restricting fluid flow
  
• Planetary hub issues, including gear damage or fluid aeration
  

Repair Recommendations

• Replace or rebuild the left travel motor if pressure testing confirms internal faults
  
• Clean or replace the swivel joint and associated hoses if flow is restricted
  
• Drain and refill the planetary hub with manufacturer-recommended hydraulic oil to restore proper lubrication
  
• Check for pinching, kinks, or blockages in hoses and fittings during reassembly
  

Maintenance Tips to Prevent Recurrence

• Maintain correct hydraulic fluid levels and monitor for leaks
  
• Schedule periodic inspection of swivel joints and travel motors
  
• Avoid overloading the excavator beyond its rated capacity
  
• Document all hydraulic system servicing, including pressure tests and oil changes
  

Conclusion
Loss of one-side travel on a Volvo 210B excavator is typically linked to hydraulic motor or swivel joint issues. Systematic inspection of fluid levels, pressure, and mechanical integrity is critical for accurate diagnosis. Regular maintenance and timely replacement of worn components can prevent downtime and ensure consistent operational performance, preserving both productivity and machine longevity.