Using Nitrogen Kits for Older Models of Bobcat Hydraulic Hammers

[MikePhua]

Introduction to Hydraulic Hammers and Nitrogen Systems
Hydraulic hammers, also known as breakers, are vital attachments for demolition, quarrying, and construction work. They rely on hydraulic power to deliver repeated impacts, breaking up concrete, rock, and asphalt. Many models, especially older ones, utilize nitrogen gas as a cushion and energy storage medium inside the hammer to optimize impact force and reduce wear.
Role of Nitrogen in Hydraulic Hammers
Nitrogen gas is used inside hydraulic hammers to:

• Act as a Cushion: Compressing nitrogen absorbs shock and protects internal components.
  
• Store Energy: Nitrogen pressure helps deliver a strong, consistent blow.
  
• Prevent Corrosion: Being an inert gas, nitrogen reduces internal oxidation.
  

Regular nitrogen charging and proper pressure maintenance are critical for hammer performance.
Why Use Nitrogen Kits on Older Bobcat Hydraulic Hammers
Older Bobcat hydraulic hammers may not have integrated nitrogen charging systems or might require external kits for maintenance. A nitrogen kit typically includes:

• High-Pressure Nitrogen Cylinder: Provides clean, dry nitrogen.
  
• Pressure Regulator: Adjusts nitrogen pressure for safe charging.
  
• Charging Hose and Fittings: Connects the nitrogen source to the hammer’s gas chamber.
  
• Pressure Gauge: Monitors the pressure during filling.
  

Using these kits allows operators to recharge nitrogen, maintain optimal hammer performance, and extend service life.
Steps to Use a Nitrogen Kit Safely

• Safety First: Always wear protective gear—gloves, eye protection, and ear protection.
  
• Depressurize the Hammer: Before charging, ensure the hammer is fully depressurized to avoid accidents.
  
• Connect the Charging Hose: Securely attach the hose from the nitrogen cylinder to the hammer’s gas valve.
  
• Set the Regulator Pressure: Adjust regulator to manufacturer-recommended nitrogen pressure (typically between 80-120 bar, depending on model).
  
• Charge Slowly: Open the cylinder valve slowly to fill the hammer’s nitrogen chamber, monitoring pressure gauge carefully.
  
• Close Valves and Disconnect: After reaching desired pressure, close valves and remove the hose safely.
  
• Check for Leaks: Inspect all fittings and the gas chamber for leaks.
  

Common Issues Addressed by Nitrogen Recharging

• Loss of Impact Power: Insufficient nitrogen pressure reduces blow force.
  
• Excessive Vibration: Proper nitrogen cushioning minimizes vibration, protecting the carrier machine and operator.
  
• Internal Damage: Maintaining correct gas pressure prevents metal-to-metal contact inside the hammer.
  
• Inconsistent Performance: Proper nitrogen levels stabilize hammer operation.
  

Maintenance Tips for Hydraulic Hammer Nitrogen Systems

• Regular Pressure Checks: Verify nitrogen pressure according to service intervals or when performance drops.
  
• Use High-Quality Nitrogen: Avoid compressed air or other gases which can cause moisture and corrosion.
  
• Inspect Seals and Valves: Worn seals may cause leaks requiring replacement.
  
• Follow Manufacturer Specifications: Adhere to recommended pressures and procedures.
  

Case Story
An equipment rental company found that older Bobcat hammers on site were losing efficiency rapidly. After training operators to use nitrogen kits to recharge the hammers correctly, blow power stabilized, and maintenance costs decreased by 25%. The company also avoided expensive hammer replacements by extending the lifespan of existing tools.
Glossary of Terms

• Nitrogen Charging Kit: A set of tools and equipment used to refill the gas chamber in hydraulic hammers.
  
• Gas Chamber: Internal cavity filled with nitrogen to cushion the hammer piston.
  
• Regulator: Device controlling gas pressure flow from the cylinder.
  
• Bar: Unit of pressure; 1 bar ≈ 14.5 psi.
  
• Depressurizing: Releasing pressure from the hammer before maintenance.
  

Summary of Best Practices

• Use nitrogen kits with proper safety precautions.
  
• Maintain recommended nitrogen pressures.
  
• Check and replace worn seals promptly.
  
• Use only pure nitrogen gas for charging.
  
• Regularly monitor hammer performance and gas pressure.
  
• Train operators in correct charging and handling procedures.
  

Conclusion
Nitrogen kits are essential for maintaining older Bobcat hydraulic hammers, ensuring they deliver optimal performance and longevity. With proper use, these kits help prevent common hammer issues and reduce costly downtime. Operators and maintenance teams should prioritize nitrogen system care as part of routine hammer servicing.