Troubleshooting Steering Issues in the 1999 JLG 3369 Electric RT Scissor Lift

[MikePhua]

The 1999 JLG 3369 Electric RT scissor lift, a robust piece of equipment known for its versatility on construction sites, occasionally presents steering challenges. One common issue reported by operators is limited steering response—where the wheels turn only about an inch in either direction despite the motor's attempt to engage. This problem can stem from various factors, including electrical faults, hydraulic issues, or mechanical failures.
Understanding the Steering System
The steering mechanism in the JLG 3369 Electric RT is powered by hydraulic actuators controlled through an electronic system. The system comprises the steering motor, hydraulic cylinders, control valves, and the electronic controller that manages the inputs from the operator's controls. When the steering is unresponsive or limited, it's crucial to diagnose the root cause systematically.
Common Causes of Steering Limitations

1. Electrical Faults: Issues such as faulty wiring, corroded connectors, or malfunctioning control switches can disrupt the signal transmission to the steering motor, leading to limited movement.
   
2. Hydraulic System Problems: Low hydraulic fluid levels, air in the system, or malfunctioning control valves can impede the flow of hydraulic fluid to the steering cylinders, restricting movement.
   
3. Mechanical Failures: Damaged steering components, such as bent rods or worn-out bushings, can physically limit the range of motion of the steering mechanism.
   

Diagnostic Steps
To accurately identify the cause of steering limitations, follow these steps:

• Inspect Electrical Components: Check for any visible signs of wear or damage on wiring harnesses, connectors, and control switches. Use a multimeter to test for continuity and proper voltage at various points in the circuit.
  
• Examine Hydraulic System: Ensure the hydraulic fluid is at the recommended level and free from contaminants. Bleed the system to remove any trapped air, and check for leaks or blockages in the lines leading to the steering cylinders.
  
• Assess Mechanical Parts: Manually test the steering components for any unusual resistance or binding. Inspect the steering rods, bushings, and linkages for signs of wear or damage.
  

Preventive Measures
To prevent future steering issues:

• Regular Maintenance: Adhere to the manufacturer's recommended maintenance schedule, including routine inspections of electrical, hydraulic, and mechanical systems.
  
• Proper Storage: Store the equipment in a dry, sheltered environment to protect it from environmental factors that can cause corrosion or wear.
  
• Operator Training: Ensure that all operators are trained in the proper use and handling of the scissor lift to prevent misuse that could lead to damage.
  

Conclusion
Steering limitations in the 1999 JLG 3369 Electric RT scissor lift can arise from various issues, but with systematic troubleshooting and regular maintenance, these problems can be effectively managed. By understanding the underlying systems and taking proactive measures, operators can ensure the longevity and reliability of their equipment.