Parker PGP517 & PGM511 Gear Pump/Motor Replacement

Genlu Hydraulic stands as a premier global manufacturer of high-strength engineered fluid power solutions, specializing in high-pressure aluminum bushing-style gear pumps, heavy-duty reversible hydraulic motors, and synchronized multi-section auxiliary fluid units for the B2B industrial market. This featured product configuration contains two industrial-grade flagship assemblies: the PGP517 Series Aluminum High-Pressure Fixed Displacement Gear Pump (OEM Cross-Reference: 3339121186 / PGP517B0160CD1H3VE6E5S-517A016) and the PGM511 Series High-Performance Aluminum Hydraulic Motor (OEM Cross-Reference: 3349219084 / PGM511A0100BL6H2NE3E3B1B1N2). Both units are custom-engineered as high-tier, structurally reinforced, and 100% drop-in interchangeable replacements for the definitive global industry standard—the Parker Hannifin PGP/PGM 500 series aluminum gear pumps and motors. We maintain stock for this series to support applications in truck-mounted power take-offs (PTO), mobile material handling equipment, vocational refuse vehicles, and agricultural harvesting attachments.

By leveraging an advanced high-tensile three-piece extruded aluminum housing, these assemblies provide high power density while significantly reducing structural dead weight compared to cast-iron configurations. Genlu’s Parker-style PGP517 and PGM511 replacements mirror the exact geometric profiles, machining tolerances, and micro-fluidic channels detailed in the original factory technical manuals. We guarantee absolute drop-in compatibility across the standard SAE B 2-bolt mounting flange and splined drive shaft on the PGP517, the SAE A 2-bolt pilot and $\phi$19.05 mm cylindrical keyed shaft on the PGM511, all working port center-to-center distances, and the internal pressure-balanced floating bushing design. Prior to final warehouse dispatch, every single pump and motor assembly undergoes 100% Full-Simulation Condition Testing on digital test benches to ensure peak volumetric delivery and low acoustic emissions under maximum loading.

Technical Specifications 

• Assembly 1: High-Pressure Tandem/Single Gear Pump (OEM Cross-Code): 3339121186 / PGP517B0160CD1H3VE6E5S-517A016

  • Product Line: PGP517 High-Pressure Aluminum Fixed Displacement Gear Pump Series

  • Geometric Displacement: 16.0 $cc/rev$ nominal delivery volume

  • Mounting Configuration: Standard SAE B 2-Bolt mounting flange ($\phi$101.6 mm pilot diameter)

  • Drive Shaft Type: Standard high-torque Involute Splined Shaft

  • Seal Material Compounds: Premium Fluorocarbon (FKM / Viton) high-temperature elastomers

  • Continuous Rated Operating Pressure Boundaries: 250 bar (25 MPa / 3625 PSI)

  • Maximum Intermittent Intermittent Peak Pressure Bound: Rated up to 275 bar (27.5 MPa / 4000 PSI)

  • Rotational Direction Dynamic Profile: C-Code designating standard Clockwise single-direction right-hand rotation

• Assembly 2: High-Pressure Reversible Hydraulic Motor (OEM Cross-Code): 3349219084 / PGM511A0100BL6H2NE3E3B1B1N2

  • Product Line: PGM511 High-Performance Aluminum Fixed Displacement Hydraulic Motor Series

  • Geometric Displacement: 10.0 $cc/rev$ nominal execution volume

  • Mounting Configuration: Standard SAE A 2-Bolt mounting flange ($\phi$82.55 mm pilot diameter)

  • Drive Shaft Type: L6-Code indicating a $\phi$19.05 mm straight cylindrical parallel keyed shaft with a 4.8 mm drive key

  • Rotation & Internal Controls: B-Code specifying Bi-directional/Reversible operation, backed by integrated dual internal check valves

  • Case Drain Port Configuration: Rear or side-located 9/16-18 UNF dedicated motor case drain connection

  • Maximum Permissible Continuous Rotational Velocity: Rated up to 3500 RPM

Key Technical Advantages:

• Pressure-Balanced Floating Bushing Construction: Rather than using standard thrust plates, the PGP517/511 series utilizes bimetal composite floating bushings. Internal pathways route pressurized fluid to the backside of the bushings, dynamically matching face loading against the gear ends. This system manages internal clearance under continuous 250 bar loading, keeping volumetric efficiency above 98% and reducing internal fluid bypass.

• High-Tensile Extruded Aluminum Three-Piece Housing Metallurgy: The main pump and motor bodies are machined from aircraft-grade, high-density extruded aluminum alloy. This metallurgy offers higher structural rigidity and tensile strength than standard cast or die-cast aluminum. This sturdy layout counteracts the intense radial loads generated at high operating pressures, protecting the housing wall from gear-tip contact and internal scoring.

• 12-Tooth Low-Pulsation Involute Gear Geometry: The gear set features an optimized 12-tooth asymmetric profile that is precision-ground using multi-axis CNC machinery. Compared to traditional 9 or 10-tooth gear sets, this 12-tooth configuration provides a higher contact ratio, reducing fluid displacement pulsations by more than 2%. This smooth operation dampens hydraulic system resonance and lowers overall acoustic noise levels.

• Standard FKM (Viton) High-Temperature Seal Package: To ensure reliability under frequent thermal cycling, all dynamic shaft lip seals and static sealing interfaces feature high-grade Fluorocarbon (FKM) elastomers, extending the continuous operating temperature threshold up to 110 °C. The PGM511 motor shaft seal includes dual sealing lips to resist transient case pressure spikes during rapid bi-directional reversals.

Application Areas:

• Modern Municipal Refuse Fleets & Vocational Utility Vehicles: Main multi-section control valve pump supply for garbage compactors and variable-speed reversible conveyor drives for salt/grit spreaders.

• Compact Mobile Construction Equipment & Agricultural Work Attachments: High-pressure open or closed-loop auxiliary tool drives for skid steer loaders (e.g., flail mowers, rotary sweepers) and mini-excavator propulsion boosters.

• Truck-Mounted Rescue Winches & Hydraulic Cranes: Primary fluid power supply for heavy-duty slide-bed recovery winches and auxiliary power units for proportional truck-mounted knuckle booms.

Expert Maintenance Tips:

• Mandatory External Case Drain Piping Configuration for PGM511 Reversible Motors: Because the PGM511 is a true bi-directional reversible motor, the dedicated case drain port must always be piped externally with an unrestrictive line running straight back to the reservoir, terminating below the minimum oil level. Do not plug this drain or tee it directly into the main system return line; high back-pressure during sudden directional changes can damage the front shaft seal.

• Pre-Lubrication Priming and Manual Shaft Rotation Prior to First Power-Up: The clearances between the gear teeth and bimetal bushings in the PGP517 are precise, and factory assembly oil can drain off during transit. Before initial installation or starting after long shutdowns, fill the pump casing with clean hydraulic oil through the intake port and manually rotate the shaft at least 3 turns to coat the wear faces and prevent dry-contact scoring.

• Inlet Vacuum Limits to Prevent Cavitation Erosion: Mobile machinery often operates at steep angles or under heavy vibration, which can induce fluid aeration or micro-bubbling. Ensure the PGP517 intake line is sized properly to keep suction vacuum within -0.2 bar. If you hear a loud metallic rattling noise, stop the system immediately to check the suction filters and prevent cavitation erosion of the aluminum internal walls.