Yanmar VIO70-2 VIO70-3A VIO75-A VIO75-C 油圧ショベルのためのRexroth AP2D36LV1RS7 油圧ポンプ

TECHNICAL DATA SHEET: YANMAR ViO70 / ViO75 HYDRAULIC PUMP

1. GENERAL IDENTIFICATION

Machine Models: Yanmar ViO70-2, ViO70-3, ViO70-3a, ViO75-a, ViO75-c

OEM Manufacturer: Uchida-Rexroth (Japan)

OEM Model Series: AP2D36LV1RS7 / AP2D36 series

Pump Configuration: Tandem Axial Piston Pump + Integrated Gear Pump (Pilot)

2. PERFORMANCE SPECIFICATIONS

Displacement (Main P1 & P2): 36.0 cc/rev x 2

Displacement (Pilot/P3): Approx. 10.0 - 12.0 cc/rev

Rated Operating Pressure: 29.4 MPa (4,264 PSI)

Maximum System Pressure: 32.0 MPa (4,641 PSI)

Rated Flow: Approx. 80.0 L/min x 2 (@ 2200 RPM)

Control System: Total Horsepower Control (Prevents engine bogging by destroking the pump under peak loads).

3. MECHANICAL INTERFACE

Input Shaft: 13-Tooth or 15-Tooth Spline (Matches Yanmar 4TNV series engine coupling).

Mounting Flange: SAE 2-bolt or 4-bolt standard (Verify based on your specific bell housing).

Porting: * Suction: Single large inlet.

Delivery: Dual high-pressure split-flow outlets for the main control valve.

Case Drain: Top-mounted return port for lubrication and cooling.

4. INTERNAL REPAIR COMPONENTS (ROTARY GROUP)
If rebuilding an AP2D36, these are the critical sub-components to inspect:

Cylinder Block (Barrel): The central rotating unit; check for "smearing" on the face.

Piston Set: 9 pistons per side (18 total). Look for play between the piston and the brass shoe.

Valve Plate (Right & Left): The most critical wear surface; if scored, the pump will lose power when the oil gets hot.

Set Plate (Retainer): Holds the shoes against the swashplate.

Cradle & Swashplate Assembly: Responsible for the variable flow angle.

Seal Kit: Includes high-pressure Viton shaft seals and all housing O-rings.

5. INSTALLATION & MAINTENANCE PROTOCOL

Case Priming: MANDATORY. Fill the pump housing with 1.5 - 2.0 liters of clean hydraulic oil before starting the engine. A dry start will cause the piston shoes to "weld" to the swashplate instantly.

Air Bleeding: Loosen the air bleed plug on the top of the pump. Wait for a steady stream of oil (no bubbles) before tightening.

Filter Service: Replace the return filter (172458-62210) and the pilot filter. Clean the magnetic suction strainer in the hydraulic tank.

System Flush: If the previous pump suffered a "catastrophic failure" (metal shards in oil), the oil cooler MUST be flushed or replaced, or the new pump will fail within 50 hours.