Rexroth AP2D36LV1RS7 hydraulic pump for Yanmar VIO70-2 VIO70-3A VIO75-A VIO75-C excavator
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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.