مضخة هيدروليكية KYB PSVD2-21E OEM B0600-21031 لـ حفارة Yanmar VIO55-5A VIO55-5B VIO55-6A VIO55-6B VIO60-6B

TECHNICAL DATA SHEET: YANMAR ViO55 / ViO60 HYDRAULIC PUMP

1. GENERAL IDENTIFICATION

Machine Models: Yanmar ViO55-5B, ViO55-6A, ViO55-6B, ViO60-6B

Yanmar Part Number: B0600-21031 (Replaces B0600-21016)

OEM Manufacturer: KYB (Kayaba)

OEM Model Series: PSVD2-21E-20 / PSVD2-21E-21

Configuration: 2 x Variable Piston Pumps + 2 x Gear Pumps (Quad-Output)

2. PERFORMANCE SPECIFICATIONS

Piston Pump Displacement (P1 & P2): 21.0 cc/rev x 2

Gear Pump Displacement (P3 & P4): Approx. 15.0 cc/rev (Main Gear) + 5.0 cc/rev (Pilot)

Rated Operating Pressure: 24.5 MPa (3,553 PSI)

Maximum System Pressure: 27.0 MPa (3,916 PSI)

Rated Flow: Approx. 46.2 x 2 + 33.0 + 11.0 L/min (@ 2200 RPM)

Control System: Total Horsepower Control / Load Sensing Compatible

3. INTERNAL COMPONENTS & REPAIR PARTS
The PSVD2-21E is a high-precision unit. Common rebuild components include:

Rotary Group: Cylinder Block (Barrel), Piston Set (Typically 9 or 10 pistons per block—check your specific serial), and Set Plate (Retainer).

Valve Plate: The timing surface; must be perfectly flat and free of scoring.

Swash Plate & Cradle: Controls the stroke length of the pistons to vary flow.

Drive Shaft: High-tensile splined shaft (Typically 13-tooth or 15-tooth).

Full Seal Kit: Includes the high-pressure shaft seal (Viton) and O-rings for the integrated gear pump sections.

4. FACTORY PRESSURE SETTINGS

Main Relief (P1/P2): 24.5 MPa

Swing / Blade Pressure (P3): 21.0 MPa

Pilot Control Pressure (P4): 3.9 MPa (Ensures smooth joystick response).

Case Drain Pressure Limit: Should not exceed 0.2 MPa (29 PSI).

5. INSTALLATION & MAINTENANCE PROTOCOL

Case Priming: MANDATORY. Fill the pump housing with clean hydraulic oil through the highest drain port before starting the engine. A dry start will destroy the valve plates in seconds.

Air Bleeding: Loosen the air bleed plug on top of the pump housing until oil flows out without bubbles.

System Flush: If the previous pump suffered a mechanical failure (metal in oil), you must flush the oil cooler and hydraulic tank. Residual debris will destroy a new PSVD2-21E.

Filter Change: Replace the return filter (172B05-62210) and the pilot line filter. Clean the suction strainer in the tank.