مضخة هيدروليكية Kawasaki K7SP36 K7V28 لـ حفارة صغيرة Yanmar VIO80 VIO80-1A VIO80U

TECHNICAL DATA SHEET: YANMAR ViO80 SERIES HYDRAULIC PUMP

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.