1995 Hitachi EX60 URG Drive Issues and Slew Problems

[MikePhua]

Introduction
The 1995 Hitachi EX60 URG excavator is a robust machine widely used for various construction tasks. However, like all equipment, it can encounter issues over time. One common problem faced by owners of this model is related to the drive system and slew operation. These problems can significantly affect the performance and efficiency of the machine. This article discusses the potential causes of drive and slew issues with the Hitachi EX60 URG and offers troubleshooting tips to resolve these problems.
Common Causes of Drive Issues
When facing drive-related issues, it's essential to understand the various factors that could be causing the problem:

• Hydraulic System Issues: The drive system of the Hitachi EX60 URG is powered by hydraulic pumps and motors. Any faults in the hydraulic system, such as low fluid levels, air in the system, or worn-out components, can affect the performance of the drive.
  
• Pump or Motor Malfunction: A malfunctioning hydraulic pump or motor can lead to a loss of power to the drive system, causing it to operate sluggishly or fail to move altogether. The problem could be due to internal wear or damage to the pump or motor.
  
• Contaminated Hydraulic Fluid: Dirty or contaminated hydraulic fluid can clog filters and prevent proper circulation, which in turn affects the efficiency of the drive and other hydraulic functions.
  
• Hydraulic Hose or Valve Issues: Leaks in the hydraulic hoses or faults in the control valves can cause a loss of hydraulic pressure, leading to drive system failures. A visual inspection for leaks and pressure tests can help identify these issues.
  

Troubleshooting Drive Issues
To diagnose and fix drive issues on the Hitachi EX60 URG, follow these steps:

1. Check Hydraulic Fluid Levels:
   • Begin by checking the hydraulic fluid levels. Low hydraulic fluid is a common cause of drive-related issues. Ensure that the fluid is at the proper level and top it off if needed.
     
   • If the fluid is old or contaminated, consider replacing it with fresh, clean fluid that meets the specifications outlined in the machine’s manual.
     
2. Inspect Hydraulic Pumps and Motors:
   • Examine the hydraulic pumps and motors for any visible damage or wear. These components are critical for the proper operation of the drive system. If the motor or pump appears damaged, it may need to be replaced.
     
   • Perform a pressure test on the hydraulic system to check if the pump is providing the necessary pressure for the drive to function correctly.
     
3. Check for Leaks:
   • Inspect all hydraulic hoses, lines, and connections for any leaks. Leaks can significantly reduce the hydraulic pressure and cause drive issues.
     
   • Pay particular attention to the hoses leading to the drive motors and pumps. If you notice any leaks, replace the damaged hoses or fittings immediately.
     
4. Examine the Control Valves:
   • Faulty control valves can disrupt the flow of hydraulic fluid to the drive system. Test the valves for proper operation and replace any that are malfunctioning.
     
5. Replace the Filters:
   • Dirty filters can restrict hydraulic fluid flow, causing the drive system to underperform. Replace the hydraulic filters regularly as part of routine maintenance to ensure proper fluid circulation.
     

Common Causes of Slew Problems
Slew issues on the Hitachi EX60 URG can also stem from several factors. The slew system, which controls the rotation of the excavator's upper structure, relies on hydraulic power. Here are some potential causes for slew issues:

• Low Hydraulic Pressure: Similar to drive issues, low hydraulic pressure can result in weak or slow slew performance. This could be due to a failing pump, blocked filters, or low hydraulic fluid.
  
• Slew Motor Problems: The slew motor could be damaged or worn out, resulting in the inability to rotate the upper structure smoothly.
  
• Damaged Slew Ring or Bearings: Over time, the slew ring or bearings can wear down, causing grinding noises and erratic rotation. If the slew ring is damaged, it may need to be replaced.
  
• Faulty Control Valves: Control valves for the slew function can malfunction, causing the rotation to be jerky or sluggish. Checking and replacing any faulty valves is essential.
  

Troubleshooting Slew Issues
To address slew issues with the Hitachi EX60 URG, follow these steps:

1. Check Hydraulic Fluid and Pressure:
   • As with drive issues, ensure the hydraulic fluid is at the proper level and is clean. Check the pressure with a gauge to verify that the system is generating sufficient pressure for the slew operation.
     
2. Inspect the Slew Motor:
   • Examine the slew motor for signs of wear or damage. If the motor is faulty, it may need to be replaced. Perform a pressure test to ensure that the motor is receiving the necessary hydraulic pressure.
     
3. Inspect the Slew Ring:
   • Look for any signs of wear or damage to the slew ring. A worn-out slew ring can cause uneven rotation or grinding noises. If the ring is damaged, it will need to be replaced.
     
4. Test the Control Valves:
   • Test the control valves responsible for the slew operation. A malfunctioning valve can disrupt the smooth rotation of the excavator. Replace any faulty valves to restore proper operation.
     

Conclusion
Drive and slew issues on the 1995 Hitachi EX60 URG excavator can be caused by several factors, including hydraulic system problems, faulty components, and wear over time. By following a methodical troubleshooting process and addressing issues with hydraulic fluid, pumps, motors, hoses, and valves, you can restore the machine's performance and efficiency. Regular maintenance, including fluid checks and component inspections, will help prevent these issues from arising in the future, ensuring the longevity and reliability of your equipment.