Yanmar B37 B37-2 B37-2A 172443-73100 hydraulic pump for Yanmar B37 B37V B37-2 B37-2A B37V-2A mini excavator
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1. GENERAL IDENTIFICATION
Machine Models: Yanmar B37 B37V B37-2 B37-2A B37V-2A
Yanmar Part Number: 172443-73100
OEM Manufacturer: Nachi-Fujikoshi (Japan)
OEM Model Series: PVD-1B-32BP-10G5-4743A (or similar suffixes)
Pump Type: Variable Displacement Axial Piston Pump (Triple Output)
2. PERFORMANCE SPECIFICATIONS
Main Pump Displacement (P1 & P2): 32.0 cc/rev x 2
Gear Pump Displacement (P3): Approx. 18.0 - 20.0 cc/rev
Total Theoretical Flow: Approx. 76.8 x 2 + 48.0 L/min (@ 2400 RPM)
Standard Operating Pressure: 21.0 MPa (3,045 PSI)
Maximum Relief Pressure: 24.5 MPa (3,553 PSI)
Input Shaft: Splined shaft (Commonly 13-tooth; verify against your engine coupling).
3. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)
For rebuilding the 172443-73100, the following internal parts are required:
Cylinder Block (Barrel): The main rotating group holding the pistons.
Piston Set: 9 precision-ground pistons with brass shoes.
Valve Plate: The timing plate that directs high-pressure oil; must be free of scratches.
Set Plate (Retainer): Holds the piston shoes against the swashplate.
Swashplate & Support: Controls the variable flow angle.
Seal Kit: Includes high-pressure shaft seal, O-rings, and gaskets for the pump housing.
4. FACTORY PRESSURE SETTINGS
Main Relief (All Functions): 21.0 MPa
Travel Relief: 21.0 MPa
Pilot Control Pressure: 3.5 - 3.9 MPa (Required for joystick and control valve actuation).
Unloading Pressure: 3.0 - 4.0 MPa.
5. INSTALLATION & COMMISSIONING PROTOCOL
Case Priming: MANDATORY. Fill the pump case with clean hydraulic oil through the top drain port before starting the engine. Running dry will cause immediate internal failure.
System Flushing: If the old pump failed due to metal contamination, the entire hydraulic system (including the tank and all cylinders) must be flushed.
Filter Change: Replace the return filter and the pilot line filter. Clean the suction strainer in the hydraulic tank.
Air Purge: Run the engine at low idle for 5-10 minutes. Cycle the boom, arm, and bucket cylinders slowly to their limits to bleed any trapped air.