Kawasaki K7SP36 K7V28 hydraulic pump for Yanmar VIO80 VIO80-1A VIO80U mini excavator
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1. GENERAL IDENTIFICATION
Machine Models: Yanmar ViO80, ViO80-1, ViO80-1A, ViO80U
Yanmar Part Number: 172B11-73200 (Replaces earlier revisions)
OEM Manufacturer: Kawasaki Precision Machinery
OEM Model Series: K7SP36 / K7V28
Configuration: Variable Displacement Axial Piston Pump (Tandem/Double)
2. PERFORMANCE SPECIFICATIONS
Displacement: $36.0$ $cm^3/rev \times 2$ (or $28.0$ $cm^3/rev$ for specific K7V variants)
Rated Pressure: $29.4$ MPa ($4,264$ psi)
Max Pressure: $34.3$ MPa ($4,975$ psi)
Rated Flow: Approx. $72.0 \times 2$ L/min (@ $2000$ RPM)
Control Type: Load Sensing (LS) and Total Horsepower Control.
3. MECHANICAL INTERFACE
Input Shaft: High-torque splined shaft (Typically 13T or 15T; verify against your engine coupler).
Mounting: SAE Standard 2-bolt or 4-bolt flange.
Porting Layout: * Suction: Single large inlet port.
Delivery: Dual high-pressure outlets (P1 & P2).
Case Drain: Top-mounted return-to-tank port (Essential for cooling).
4. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)
For a "Major Rebuild" of the 172B11-73200, the following parts are standard:
Cylinder Blocks: Precision-honed barrels.
Piston Set: 9 pistons per side (18 total) with high-strength brass shoes.
Valve Plates: Mirror-finished timing plates (Left and Right specific).
Set Plate & Ball Guide: Retains the pistons against the swashplate.
Swashplate & Cradle Bearings: Components that allow variable flow adjustment.
Seal Kit: Heavy-duty Viton shaft seals and O-ring sets.
5. INSTALLATION & MAINTENANCE PROTOCOL
Case Priming: MANDATORY. Fill the pump case 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 vent plug on top of the pump until oil flows out without air bubbles.
System Flush: If the previous pump suffered a mechanical failure, you must flush the oil cooler and hydraulic tank. Metal debris is the primary cause of premature failure in new pumps.
Filter Change: Replace the main return filter and the pilot line filter. Clean the magnetic suction strainer in the tank.