Yanmar SV100-2B SV100-2A-2PB SV100-2A 172B12-73100 hydraulic pump for mini excavator
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1. GENERAL IDENTIFICATION
Machine Models: Yanmar SV100-2A, SV100-2A-2PB (Two-Piece Boom), SV100-2B
Yanmar Part Number: 172B12-73100
System Type: Variable Displacement Axial Piston Pump (Main) + Gear Pump (Pilot)
Configuration: Tandem / Double Pump assembly
2. PERFORMANCE SPECIFICATIONS
Main Pump Displacement (P1 & P2): Approx. 38.0 - 40.0 cc/rev x 2
Pilot Pump Displacement (P3): 10.8 - 12.0 cc/rev
Maximum Flow Rate: Approx. 85.0 - 90.0 L/min x 2 (at rated RPM)
Rated Working Pressure: 32.0 MPa (4,641 PSI)
Maximum Relief Pressure: 35.0 MPa (5,076 PSI)
Control System: Load Sensing (LS) with Electronic Flow Control integration
3. MECHANICAL INTERFACE
Input Shaft: 13-Tooth or 15-Tooth High-Torque Spline (Verify against engine flywheel coupling).
Mounting: SAE Standard 2-Bolt or 4-Bolt Flange.
Ports: * Suction: Single inlet (typically bottom or side mount).
Delivery: Dual high-pressure split-flow outlets.
Case Drain: Top-mounted return port for internal lubrication.
4. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)
Cylinder Blocks: Precision-honed for high-pressure piston stability.
Pistons: 9-piston configuration per rotating group (High-tensile steel with brass shoes).
Valve Plates: Specifically timed for the SV100-2's quiet operation requirements.
Swash Plate / Cradle Assembly: Allows for infinite variable flow adjustment.
Seal Kit: High-pressure Viton/HNBR seals for high-temperature resistance.
5. HYDRAULIC CALIBRATION SETTINGS
Main Relief (Standard): 32.0 MPa
2-Piece Boom (2PB) Circuit Pressure: Variable (controlled by secondary relief valves).
Pilot Control Pressure: 3.9 - 4.1 MPa (Required for responsive joystick operation).
LS Margin Pressure: 1.8 - 2.2 MPa (Determines "standby" responsiveness).
6. INSTALLATION & COMMISSIONING PROTOCOL
Case Priming (CRITICAL): You must fill the pump housing with clean hydraulic oil through the highest drain port before starting the engine.
System Flushing: If the previous pump suffered a mechanical failure, the oil cooler and all lines must be flushed. Residual debris will destroy the new 172B12-73100 unit.
Filter Maintenance: Replace the main return filter (172B12-62210 or equivalent) and the pilot line filter.
Bleeding Air: Run at low idle for 5-10 minutes and slowly cycle all cylinders (Boom, Arm, Bucket) to purge trapped air.