Description
OEM-Quality Komatsu D475A-5 Hydraulic System & Components
Achieve high-breakout digging force, precise blade response, and maximum rock-ripping penetration with an OEM-spec Komatsu D475A-5 Hydraulic System Assembly. Engineered for Komatsu D475A-5, D475A-5EO, and D475A-5SD (100-tonne operating weight class) mining dozers, this high-pressure hydraulic architecture powers the front dozer blade (lift, tilt, pitch) and rear heavy-duty single or multi-shank parallelogram rippers.
Built around Komatsu’s advanced Closed-Center Load Sensing System (CLSS), the hydraulic pump output automatically adjusts to match work equipment demand, preventing engine power loss and lowering hydraulic oil operating temperatures during high-cycle slot-dozing.
Key Features & Benefits
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Closed-Center Load Sensing System (CLSS): Delivers proportional, multi-function control over blade elevation and pitch without flow interference or speed drop.
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Variable-Displacement Axial Piston Pumps: Engine-driven high-capacity piston pumps modulate hydraulic flow from zero to max output (up to 537 L/min), minimizing engine horsepower drag when idling.
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Proportional Hydraulic Control Valve Group: Precision-spooled main control valve bank provides immediate joystick response and fine grading control.
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Heavy-Wall Seamless Steel Hydraulic Cylinders: Induction-hardened, chrome-plated piston rods equipped with multi-stage polyurethane seals resist silica scoring and extreme impact pressure spikes.
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High-Capacity In-Tank Filtration & Cooling: Integrated high-flow return line filters and heavy-duty hydraulic oil cooler galleries keep fluid clean and within ideal viscosity ranges during 24/7 mining shifts.
Verified Technical Specifications
| Parameter | Specification |
| Compatible Machine Models | Komatsu D475A-5 / D475A-5EO / D475A-5SD Super Dozer |
| Dozer Operating Weight Class | 102,500 – 108,000 kg (225,970 – 238,100 lbs) |
| Engine Partner | Komatsu SDA12V140E-3 V12 (899 HP / 671 kW) |
| System Type | Closed-Center Load Sensing System (CLSS) |
| Max Hydraulic Flow Rate | 537 L/min (141.9 gpm) |
| Relief Valve Pressure Setting | 27.5 MPa (280 kg/cm² / 3,980 psi) |
| Hydraulic Tank Refill Capacity | 130 L (34.3 gal) |
| Blade Lift Cylinders | Double-acting (Bore 180 mm x Qty 2) |
| Blade Tilt Cylinders | Double-acting (Bore 220 mm x Qty 1 or 2) |
| Ripper Lift & Tilt Cylinders | Lift (Bore 220 mm Qty 2), Tilt (Bore 200 mm Qty 2) |
| Application | Dozer Blade Control, High-Penetration Rear Ripper Operation |
