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Text Reference
HYDRAULIC SCHEMATIC COLOR CODE Black - Mechanical Connection. Seal
Red - High Pressure Oil
Dark Gray - Cutaway Section
Red / White Stripes - 1st Pressure Reduction
Light Gray - Surface Color
Red Crosshatch - 2nd Reduction in Pressure
White - Atmosphere or Air (No Pressure)
Pink - 3rd Reduction in Pressure
Purple - Pneumatic Pressure
Red / Pink Stripes - Secondary Source Oil Pressure
Yellow - Moving or Activated Components
Orange - Pilot, Charge or Torque Converter Oil
Cat Yellow - (Restricted Usage) Identification of Components within a Moving Group
Orange / White Stripes - Reduced Pilot, Charge, or TC Oil Pressure
Brown - Lubricating Oil
Orange / Crosshatch - 2nd Reduction in Pilot, Charge, or TC Oil Pressure
Green - Tank, Sump, o r Return Oil
Blue - Trapped Oil
Green / White Stripes Scavenge / Suction Oil or Hydraulic Void
HYDRAULIC SCHEMATIC COLOR CODE This illustration identifies the meanings of the colors used in the hydraulic schematics and cross-sectional views shown throughout this presentation.
