From self-help guides for troubleshooting to complete video tutorials, you’ll find a wealth of information about our products below:


Controlled Demolition Equipment

The Hydraulic Cylinder Has Oil Leaks

Promptly replace the gasket kit as follows:
  1. Release the machine cylinder making sure that the oil dynamic system is switched off and free from pressure.
  2. Completely empty the hydraulic oil cylinder and lock it on the bench in a suitable vice.
  3. Manually extract the stem until it has travelled almost the whole stroke (if necessary use a puff of compressed air to help)
  4. Loosen the stem-guiding head by using the compass wrench, insert in the holes located in the front.
  5. After completely loosening it, let the head slide forwards manually so that you can see the front part of the piston.
  6. Next extract the stem by gripping (or supporting it with lifting equipment) the front attachment and pulling it towards the outside by using by an oscillating movement, from up to down.
  7. Free the cylinder liner and lock the stem in the vice using soft jaws.
  8. Loosen the piston by tightening ring nut, then extract the piston itself and the head from the stem.
  9. Visually check the smoothed and chrome-plated surfaces of the liner and stem and check (if it has a parallel lathe) the straightness of both.
  10. Remove the seals from their places.
  11. Carefully clean all the components and replace the whole kit of seals, greasing it with hydraulic oil.
  12. Check the attachments of the cylinder and, if necessary, replace the bushings which constitute the mechanical fulcrum and anchoring parts of the machine.
  13. Reassemble the cylinder carrying out the same operations as for disassembly in the reverse order.
  14. Before reconnecting the cylinder to the machine, check that it works correctly while on the bench with the cylinder assembled, if possible, by using an electrohydraulic control unit at a pressure of no less than 200 bar. It is recommended to print the service date.

Observed Slack or Dangling of the Jaw

In this case, it is necessary to intervene promptly by replacing the spacers between the pulverizer body and the moving parts.

Observed Slack of the Base Bearing

  1. It is necessary to inspect the tensioning force of the bolts (tightening torque Nm 387) using the cross technique.
  2. If the slack is caused by wear on the base bearing rolling tracks and is greater than four (4) times the initial slack, do not hesitate to contact our technical service to replace the bearing itself.

The Crusher Does Not Turn or Turns Slowly

  1. Check the tightening – tightening force of the pins 4.97 kg – of the coupling pins of the gear motor to the rotation box.
  2. Check that the pressure and flow parameters are correct.
  3. Check the oil levels of the gear motor (recommended oil SAE 80W/120). Visually check that there are no leaks.

The Hydraulic Cylinder is Slow

Ensure that the pressure and flow parameters reflect those recommended by the manufacturer by calibrating the maximum pressure valve.


Hydraulic Hammer Does Not Start

  • Cause: Clamped tool. Solution: Remove and replace the tool.
  • Cause: Fault in the rubber hoses with quick couplings (not getting oil). Solution: Check the hoses, repair or replace the grafts.
  • Cause: Fault in the control valves hydraulic excavator. Solution: Check that the pressure relief system hammer occurs after the 200 bar
  • Cause: Insufficient hydraulic oil in the tank and/or the excavator. Solution: restore the oil level.
  • Cause: Faulty breaker. Solution: Remove the breaker and control.

Low Power Beat

  • Cause: Low nitrogen pressure in the head “exhaust.” Solution: Check and restore the pressure in the head.
  • Cause: Nitrogen accumulator exhibits high-pressure exhaust. Solution: Check diaphragm accumulator.
  • Cause: Insufficient hydraulic oil flow. Solution: Restore the proper flow of oil, check the pressure to ensure flow returns to normal.
  • Cause: High oil temperature in the tank. Solution: Check the level the oil level in the tank and the cooling circuit.
  • Cause: Low oil pressure. Solution: Check that the setting of the pressure relief valve of dem. is at least at 200 bar.

Low Speed With a Lot of Energy for Stroke

  • Cause: Tool stuck in the lower head. Solution: Carefully try to remove the tool.
  • Cause: Demolition partially blocked. Solution: Hammer or other dynamic element has malfunctioned.

Oil Leak From the Tool

  • Cause: Cylinder seals worn. Solution: Remove and replace all the seals.

Oil Leak Between Head and Cylinder

  • Cause: Bolts not tightened or broken. Solution: Tighten the bolts or replace if broken.

Temperature Too High

  • Cause: Getting more oil than expected. Solution: Restore parameters.
  • Cause: Air temperature too high. Solution: Install one additional heat exchanger.
  • Cause: Low oil level in the tank excavator. Solution: Restore the oil level in the tank.

Dealer Support

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Overview of our line of controlled demolition equipment.

Overview on how OSA hydraulic hammers operate and tips on their maintenance.