HYDRAULIC HAMMER & BREAKER USAGE

Practical Tips for Using Heavy Demolition Tools

The service life of a tool is determined by how long the working side remains unworn, measured in hours, days, or months. This comparison method is only meaningful if usage conditions are consistent. Differences in material to be broken and beating frequency can cause standard deviations in a ratio of 1:100 for equivalent tools.

Guide for Proper Tool Usage

  • Liberally apply grease to high-stress tools before insertion into the hammer.
  • Operate the breaker only after positioning the demolition tool on your work surface.
  • Stop hammer immediately when the material breaks up.
  • Prevent excessive play between the chuck bushing and tool to avoid breakage or damage.
  • Use short strikes (maximum 10-20 seconds), then adjust the hammer’s angle or position. Allow the tool to air-cool if it heats up.
  • Apply high-pressure grease at least four times daily to maintain the lubricating film.
  • Recondition dull or damaged tools through milling, planing, or lathing.
  • Ensure the strike position is at a 90-degree angle to the work surface. The shank, chuck, and carrier should form a unit.
  • Gradually break up material section by section, starting at the edge and working towards the center.

The Most Frequent Causes of Heavy Demolition Tool Breaks

  • Tools of flawless construction with sufficient heat treatment strength usually break due to massive bending, starting at the edge of the tool. Fracture lines indicate forced break.
  • Beyond massive bending and excessive play in the guide bush, incorrect strike positions with transverse strikes cause breaks. If the force is introduced at an angle deviating more than 5° from the vertical, there’s a risk of forced break.
  • Vibration failure occurs when piston striking energy transfers to the tool, causing elastic upending and subsequent stress. This stress leads to vibration failure, evident by a smooth permanent fracture surface and a grained residual fracture from the weakening cross-section.

Factors Increasing Vibration Failure Risk:

  • Tension peaks from wedge-type surface damage due to sharp-edged bending.
  • Surface damage on the tool’s shank from poor lubrication, insufficient lubrication, or excessive surface pressing while positioning the tool at an angle.
  • Blank-firing occurs when the piston strikes the tool just as it breaks through the material.
  • Idle-firing happens when the piston cycles without striking the tool, used as a warm-up procedure for some breakers without harming components.

Common Causes of Heavy Demolition Tool Breaks:

  • Failure due to blank-firing or excessive wear of bushings and/or front head.
  • Breakage from operation with worn-out retaining pins, blank-firing, or tool twisting.
  • Misalignment between down pressure, hammer, and tool (e.g., from prying or levering).
  • Improper contact between the tool’s tip and the material.
  • Fast wearing or mushrooming from operating too long on the same spot.
  • Fatigue breakage due to steel defects.

Summary of Causes of Heavy Demolition Tool Breaks:

  • Anything interfering with the flow of compressive and tensile stresses increases fatigue stress, raising the risk of early fatigue failure.
  • Side forces during operation, like prying or incorrect working angles, are detrimental to tool life. Hydraulic power can snap a tool if used incorrectly.
  • Blank-firing occurs when the hammer piston strikes the tool without proper contact with the workpiece.
  • Low temperatures make tools more susceptible to fatigue failure; they should be warmed before extensive use.
  • Mechanical and thermal damage, like scratches or gouges, increases the risk of fatigue failure.
  • Poor lubrication causes metal-to-metal contact, leading to deep damage marks and fatigue cracks.
  • Corrosion from weather exposure makes tools more likely to fail. Keep tools well-greased and sheltered when not in use.
Scroll to Top
Scroll to Top