Air motor “bounces” at top or bottom of the stroke.

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

  • Remove poppet mufflers and check for proper changeover.
  • Clean or replace the poppet valve.
  • Problem poppet is typically opposite from where motor bounces, because the opposite poppet valve is slightly leaking, preventing proper changeover.
  • Inspect piston valve for damage and proper orientation.
  • Replace valve body or entire air valve assembly.
  • Inspect piston valve for damage and proper orientation.
  • Replace valve body or entire air valve assembly.