Troubleshooting Altec AT37G Boom Lift Hydraulic Failures: A Comprehensive Guide

[MikePhua]

Introduction
The Altec AT37G articulating boom lift is a versatile piece of equipment widely used in utility, maintenance, and construction industries. Its hydraulic system powers various boom functions, including elevation, extension, rotation, and tilt. When these functions fail, it can significantly impact productivity and safety. This guide delves into common hydraulic issues, diagnostic steps, and solutions to restore optimal performance.

Understanding the Hydraulic System
The AT37G's hydraulic system comprises several key components:

• Hydraulic Pump: Driven by the vehicle's engine or a separate power take-off (PTO) unit, it generates the flow necessary to operate the boom functions.
  
• Rotary Joint: Allows hydraulic fluid to pass between the stationary base and the rotating boom, facilitating continuous movement.
  
• Control Valves: Direct the flow of hydraulic fluid to specific boom functions based on operator input.
  
• Hydraulic Cylinders: Actuate the boom's movements, including elevation, extension, and tilt.
  
• Pressure Relief Valves: Prevent system overloads by releasing excess pressure.
  

Common Hydraulic Failures and Diagnostic Steps

1. Complete Loss of Boom Functionality
   • Symptoms: None of the boom functions (elevation, extension, rotation, tilt) operate.
     
   • Potential Causes:
     • Complete loss of hydraulic fluid.
       
     • Severe blockage or failure in the hydraulic pump.
       
     • Major leak in the hydraulic system.
       
   • Diagnostic Steps:
     • Check hydraulic fluid levels and refill if necessary.
       
     • Inspect the hydraulic pump for signs of damage or failure.
       
     • Look for visible leaks in hoses, fittings, and cylinders.
       
2. Slow or Jerky Boom Movements
   • Symptoms: Boom movements are sluggish or inconsistent.
     
   • Potential Causes:
     • Air trapped in the hydraulic system.
       
     • Partial blockage in hydraulic lines or valves.
       
     • Worn or damaged hydraulic components.
       
   • Diagnostic Steps:
     • Bleed the hydraulic system to remove air.
       
     • Inspect and clean hydraulic lines and valves.
       
     • Check for wear or damage in cylinders and seals.
       
3. Unresponsive or Erratic Control Inputs
   • Symptoms: Joystick or control panel inputs do not correspond to boom movements, or movements are erratic.
     
   • Potential Causes:
     • Faulty control valves or solenoids.
       
     • Electrical issues affecting control signals.
       
     • Contamination in the hydraulic fluid.
       
   • Diagnostic Steps:
     • Test control valves and solenoids for proper operation.
       
     • Inspect electrical connections and wiring.
       
     • Check hydraulic fluid for contamination and replace if necessary.
       

Preventive Maintenance Tips

• Regular Fluid Checks: Monitor hydraulic fluid levels and quality.
  
• System Bleeding: Periodically bleed the hydraulic system to remove trapped air.
  
• Component Inspections: Regularly inspect hoses, fittings, and cylinders for signs of wear or damage.
  
• Cleanliness: Keep the hydraulic system clean to prevent contamination.
  
• Manufacturer's Guidelines: Adhere to Altec's recommended maintenance schedules and procedures.
  

Conclusion
Hydraulic failures in the Altec AT37G boom lift can stem from various issues within the hydraulic system. By systematically diagnosing symptoms, identifying potential causes, and following appropriate corrective actions, operators and maintenance personnel can restore functionality and ensure safe operation. Regular preventive maintenance is crucial in minimizing downtime and extending the lifespan of the equipment.