Square Shooter 842 Terex Stalling During Boom: Troubleshooting and Solutions

[MikePhua]

Introduction to the Square Shooter 842 Terex
The Square Shooter 842 Terex is a versatile piece of equipment, typically used for various construction and lifting tasks. However, like many machines, it can experience operational issues over time. One common issue with the Square Shooter 842 Terex is stalling when the boom is raised. This problem can be frustrating and may hinder the machine’s efficiency, especially during critical tasks. Understanding the potential causes of this issue and how to troubleshoot it can help resolve the problem quickly and get the equipment back to work.
Common Causes of Stalling During Boom Lift

1. Hydraulic System Problems
   • Low Hydraulic Fluid Levels: One of the most common reasons for stalling when the boom is raised is insufficient hydraulic fluid. Hydraulic systems rely on fluid to power the lift cylinders, and if the fluid levels are too low, it can cause the system to fail or struggle when lifting the boom. Checking and topping up the hydraulic fluid can resolve this issue.
     
   • Contaminated Hydraulic Fluid: If the hydraulic fluid is contaminated with dirt, water, or air, it can cause irregularities in the hydraulic system’s operation. Contaminated fluid may prevent the boom from lifting properly or cause stalling. Flushing and replacing the hydraulic fluid should restore the system’s performance.
     
   • Faulty Hydraulic Pump: A malfunctioning hydraulic pump may not generate enough pressure to operate the boom, leading to stalling. If the pump is worn out or damaged, it may need to be repaired or replaced.
     
2. Engine Power Issues
   • Insufficient Engine Power: The engine provides the necessary power to run the hydraulic pump. If the engine is not producing enough power, it can result in stalling when the boom is lifted. This could be due to a variety of issues, including fuel problems, air intake restrictions, or engine wear. Checking the engine’s performance and addressing any issues will help ensure that it provides the necessary power for lifting.
     
   • Fuel Delivery Problems: Clogged fuel filters or fuel line issues can restrict fuel flow to the engine, causing it to lose power. Replacing the fuel filters or inspecting the fuel system for blockages can resolve power loss issues and prevent stalling.
     
3. Electrical System Malfunctions
   • Faulty Wiring or Connections: The electrical system of the Square Shooter 842 Terex controls various functions, including hydraulic pumps and safety systems. If there is a loose wire or corroded connection, it could cause intermittent power loss or improper hydraulic operation, leading to stalling when lifting the boom. Inspecting the wiring for any loose or damaged connections and repairing them is crucial.
     
   • Battery or Alternator Issues: A weak battery or malfunctioning alternator can lead to a power shortage, which may cause the machine to stall when additional power is required, such as when lifting the boom. Ensuring that the battery is fully charged and that the alternator is working properly is key to resolving electrical issues.
     
4. Load and Hydraulic Pressure Imbalances
   • Excessive Load on the Boom: If the boom is lifting more than its rated capacity, the machine may stall as the hydraulic system struggles to lift the heavy load. Always ensure that the load being lifted is within the recommended capacity for the Square Shooter 842 Terex to avoid overloading the hydraulic system.
     
   • Hydraulic Pressure Relief Valve Issues: The hydraulic pressure relief valve is designed to prevent excessive pressure buildup in the hydraulic system. If this valve is stuck, malfunctioning, or improperly set, it can cause pressure imbalances that result in stalling during boom operation. Inspecting and adjusting the pressure relief valve may be necessary.
     
5. Overheating
   • Overheated Hydraulic System: The hydraulic system can overheat if the fluid is not circulating properly, especially when the machine is under heavy load. Overheating can cause the system to shut down or malfunction, resulting in stalling during boom lifts. Checking the hydraulic cooler, filters, and fluid levels can help prevent overheating issues.
     
   • Engine Overheating: If the engine temperature is too high, it can lead to power loss and cause the machine to stall. Overheating could be due to a malfunctioning radiator, coolant system, or clogged air filters. Ensuring the engine is running at optimal temperature can help prevent stalling.
     

Steps to Troubleshoot and Fix the Stalling Issue

1. Check Hydraulic Fluid Levels and Quality
   Start by checking the hydraulic fluid levels. If the fluid is low, top it up with the recommended fluid. If the fluid is contaminated, flush the system and replace the fluid with fresh, clean fluid.
   
2. Inspect the Hydraulic Pump
   If the hydraulic fluid levels are fine and there’s still stalling, inspect the hydraulic pump. Look for signs of wear, damage, or malfunction. If necessary, replace the pump.
   
3. Examine the Engine Power
   Check the engine for power-related issues. Ensure the fuel system is clean, filters are replaced, and there are no blockages. Also, inspect the air intake system for any obstructions that could limit engine performance.
   
4. Inspect Electrical Connections
   Check the electrical system, including the wiring, battery, and alternator. Look for loose or corroded connections and ensure that the battery is properly charged.
   
5. Check for Overloading
   Ensure that the load being lifted by the boom is within the machine’s rated capacity. If the load is too heavy, reduce it to avoid straining the hydraulic system.
   
6. Monitor Hydraulic Pressure Relief Valve
   Inspect the hydraulic pressure relief valve and ensure it is working correctly. Adjust it if necessary to prevent pressure imbalances.
   
7. Prevent Overheating
   Ensure that both the hydraulic system and engine are not overheating. Check the hydraulic cooler and air filters, and ensure the engine coolant system is working properly.
   

Conclusion
Stalling during boom operation on the Square Shooter 842 Terex can stem from a variety of issues, including hydraulic system problems, engine power issues, electrical malfunctions, load imbalances, and overheating. By systematically troubleshooting these areas and addressing the root cause, operators can restore proper functionality to the machine and prevent further stalling. Regular maintenance and timely repairs can also help avoid such issues in the future, ensuring the longevity and reliability of the Square Shooter 842 Terex.