Yanmar ViO27-5B OEM hydraulic pump for mini excavator
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1. GENERAL IDENTIFICATION
Machine Model: Yanmar ViO27-5B
OEM Manufacturer: Nachi-Fujikoshi (Japan)
OEM Model Series: PVD-1B-24BP-8AG5-5085B (and variants)
Yanmar Part Numbers: 172A47-73100, 172A47-73101
Pump Type: Variable Displacement Axial Piston Pump + Integrated Gear Pump
2. PERFORMANCE SPECIFICATIONS
Piston Pump Displacement (P1 & P2): $24.0$ $cm^3/rev \times 2$
Gear Pump Displacement (P3): Approx. $16.0$ to $18.0$ $cm^3/rev$
Rated Operating Pressure: $21.0$ MPa ($3,045$ psi)
Maximum Relief Pressure: $24.5$ MPa ($3,553$ psi)
Input Shaft: Splined shaft (Commonly 13-tooth or 15-tooth; verify against flywheel coupling).
3. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)
For a "Major Rebuild," the following precision parts are required for the PVD-1B-24BP:
Cylinder Block (Barrel): The main rotating unit housing the pistons.
Piston Set: 9 pistons with brass shoes (per side).
Valve Plate: Critical timing plate. Wear here is the #1 cause of power loss when oil is hot.
Set Plate (Retainer): Holds the piston shoes against the swashplate.
Swashplate & Support: Controls the displacement angle/flow rate.
Seal Kit: High-pressure shaft seal, housing O-rings, and gear pump seals.
4. FACTORY CALIBRATION SETTINGS
Main Relief (P1/P2): $21.0$ MPa
Travel Relief Pressure: $21.0$ MPa
Auxiliary / Blade Pressure (P3): $20.6$ MPa
Pilot Control Pressure: $3.5$ - $3.9$ MPa
5. INSTALLATION & COMMISSIONING PROTOCOL
Case Priming: MANDATORY. Fill the pump case with clean hydraulic oil through the top drain port before starting. Starting "dry" will cause the piston shoes to seize to the swashplate instantly.
Air Bleeding: Loosen the air vent plug on top of the pump until oil flows without bubbles.
Suction Line: Inspect the suction hose for cracks. Air entering here causes cavitation, which sounds like "marbles" rattling inside the pump.
Filter Change: Replace the return filter and the pilot line filter. Clean the suction strainer in the tank.