Yanmar ViO40 ViO45 ViO50 ViO55 Hydraulic Main Pumps and Swing Motors Optimize the core hydraulic pressure and upper structure rotational speed of your compact fleet with premium-grade replacement main pumps and integrated swing motor assemblies engineered for Yanmar mini excavators. Designed to sustain relentless 360-degree slewing cycles and maximize continuous system flow under aggressive operating demands, these hydrostatic parts ensure smooth work cycles and long-term durability. Applicable Excavator Models and Specifications Compatible Excavators: Yanmar ViO40, ViO45, ViO45-5B, ViO50, ViO50-2A, ViO55, ViO55-5, ViO55-5B Mini Excavators Associated Engine Models: Yanmar 3TNV88, 4TNV88, 4TNV94L, 4TNV98 Diesel Engines Yanmar High-Pressure Hydraulic Main Pumps The variable displacement axial piston main pump acts as the central heart of the hydraulic network. Precision-machined cylinder block groups and integrated control valves eliminate structural pressure fluctuations and prevent system cavitation during simultaneous multi-function tool operations. Part Numbers & Technical Cross-References Primary Pump Series Reference: PSVD2-17E, PSVD2-17E-23, PSVD2-21E-23 OEM Production Codes: 172961-73100, 172961-73101, 172961-73102, 172961-73103 Alternative Replacement Layouts: 172461-73103, B0600-16023, B0600-16004, B0600-16007 Yanmar Slewing Swing Motor Assemblies The compact axial piston swing motor handles rotational momentum with built-in deceleration control. Its robust engineering dampens intense dynamic inertial shock loads during rapid swinging and immediate braking cycles. Part Numbers & Related Rotary Groups Primary Swing Motor Model: PCL-120-18B Yanmar Assembly Numbers: 172425-73540, 172461-73310, 172460-73720 Internal Service Elements: 172460-73710 Drive Pinions, 172425-73410 Carrier Kits, and 172460-73740 Motor Seal Kits Key Technical Advantages Integrated Shock Relief Controls: Factory-configured with dynamic cushion valves that absorb massive hydraulic spikes during abrupt stops, saving the primary slewing gear ring from structural cracks. Induction-Hardened Metallurgy: Critical internal sliding wear plates, cylinders, and planetary gears undergo special heat treatments to minimize friction wear under high fluid temperatures. Direct Drop-In Structural Alignment: Machined to exact factory mounting boundaries and spline metrics, enabling rapid field assembly with zero retrofitting or machine modification required. Related Part Numbers NO P.N. NAME 1 272-6959 CAT SBS140 Hydraulic Pump 272-6959 FOR CAT E325D 2 VOE14636561 Swing Motor VOE14636561 Slewing Assembly fro Volvo EC80 3 07137-06010 Komatsu Bushing 07137-06010 for HD465 HD785 Dump Truck 4 SAA6D125E-5 SAA6D125E-5 Engine Assembly for Komatsu PC400-8 PC450-8 Excavator 5 600-815-9650 Komatsu Heater 600-815-9650 for HD785-7 rigid dump truck 6 3G-8746 Hydraulic Cylinder Rod Assembly 3G-8746 for Caterpillar D7H D7R Tracto... 7 723-63-21102 723-63-21102 Main Control Valve Assembly for Komatsu D65-12 Crawler Do... 8 260-6650 260-6650 Final Drive Assembly for CAT D6R LGP Bulldozer 9 EM8838 Rear Suspension Cylinder EM8838 for Komatsu 830E Series Mining Trucks 10 6E-1111 6E-1111 Hydraulic Cylinder Rod for Caterpillar D8R Dozer 11 235-2026 235-2026,7W-0561 Diesel injection pump for Cat 3412 engine Fuel Inject... 12 569-07-88352 Komatsu Air Conditioning Hoses 569-07-88352, 569-07-88200, 569-07-8833... 13 9J-5866 Hydraulic Cylinder Rod Assembly 9J-5866 for Caterpillar D9L D9N D9R D1... 14 705-51-30820 705-51-30820 Hydraulic Gear Pump for Komatsu WA470 WA480 Series Wheel ... 15 401-00454 401-00454 Doosan DH370 Swing Gearbox Replacement Reduction Gear 16 708-2H-00453 Main Hydraulic Pump 708-2H-00453 708-2H-00450 for Komatsu PC400-7/450-... 17 708-2K-00113 Komatsu PC800-8 Hydraulic Pump 708-2K-00113 18 8E-5273 8E-5273 D6R Planetary Steering Clutch & Brake Group 19 4689079 Hitachi EX1900-5 EX1900-6 Hydraulic Pump 4689079 20 EJ6895 Front Suspension Cylinder EJ6895 for Komatsu 830E 830E-1AC 830E-AC Min... 21 6219-81-8810 Komatsu 6219-81-8810 6219-81-8820 Fuel Injector Harness for HD785 SAA1... 22 707-88-26230 Komatsu Bucket Cylinder Assembly 707-88-26230 for PC2000-8 23 20Y-62-32100 Komatsu PC1250-7/ PC1250-8 Center Swivel Joint 20Y-62-32100 24 600-311-9711 Komatsu Fuel Water Separator Assembly 600-311-9711 for PC400-7 Excavat... 25 569-40-81550 Komatsu Pin 569-40-81550 for HD465 HD785 Mining Trucks 26 SAA6D140E-5 SAA6D140E-5 Complete Engine Assembly for Komatsu PC800-8 PC850-8 Excav...
