CASE D150C Hydraulic Schematic – Complete Hydraulic System for Crawler Dozer

Technical Highlights

• Model: CASE D150C Crawler Dozer

• Document Type: Factory Hydraulic Schematic

• Part Number: RAC #47714315 Rev. E

• Format: Color-coded PDF diagram

• Language: English

• System Coverage: Full hydraulic architecture – track drive, implement, fan drive, load sense, pilot, and charge systems

• Color Legend (page 1 diagram):
  • Red = Hydraulic Pressure • Orange = Charge Pump Pressure • Cyan = Return to Tank / Pump Inlet
  • Purple = Track Drive • Blue = Track Drive Case Drain • Green = Load Sense

Coverage

• Overview
   • Color legend for pressure, return, and load sense circuits
   • Pressure ratings and hydraulic test points (234 bar travel / 280 bar implement / 350 bar load sense)

• Main Hydraulic Circuits
   • Track Drive System – Dual motor layout with speed sensors and flushing valves
   • Implement Functions – Lift, tilt, angle, and ripper circuits with load-sense feedback
   • Charge and Pilot System – Charge filters, pressure switches, accumulators, and neutral override valve
   • Fan Drive Circuit – Fan speed control and reverse valves integrated with pilot logic
   • Load Sense System – Dynamic pressure compensation for pumps and actuators

• Component Reference List (77 items) Includes Track Drive Motors (1 & 8), Oil Cooler (12), Hydraulic Reservoir (24), Lift & Tilt Cylinders (41–42), Fan Drive Motor (68), Ripper Spool (56), and Load Sense Relief Valve (46).

• Performance Data
   • Main System Pressure – 420 bar
   • Charge Pressure – 25–30 bar
   • Pilot Pressure – 16 bar
   • Load Sense – 203–210 bar
   • Implement Pressure – 280 ± 5 bar

Delivery

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