The video addresses troubleshooting the Mark 67 Piloted Pressure Regulator.

Load Pressure Tubing: This specific tubing connects the top of the diaphragm case to the outlet of the pilot.

Troubleshooting Procedure: Inspecting the Pilot Bleed Orifice
The guide recommends removing the load pressure tubing, which connects the top of the diaphragm case to the outlet of the pilot, to allow a clear inspection of the pilot bleed orifice.

The steps are as follows:

  • Access the Orifice: Remove the top cap located in the center of the upper case.
  • Remove the Plug: Take out the small internal plug to view the components below.
  • Visual Inspection: Look down into the assembly to ensure that the small hole in the metal piece, situated immediately below the cover, is clear of obstructions.
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