Parker PGP500 Series Gear Pump | PGP517 PGP511 | Tandem Pump

Genlu Hydraulic proudly introduces the meticulously engineered PGP500 Series (encompassing PGP503, PGP505, PGP511, and PGP517) extruded aluminum high-pressure gear pumps. These are lightweight, high-power-density core power units specifically tailored for mobile machinery and commercial vehicles. This series serves as the ultimate drop-in replacement for Parker’s industrial standard components, including highly complex multi-section engineering variants such as the PGP517B0160CD1H3NB1E5C-517A0160XE7E5B1B1 (representing a PGP517 tandem setup with 16 cc/rev + 16 cc/rev, clockwise rotation, and specific flange/spline configurations). Functioning as the heartbeat of your hydraulic system, Genlu unequivocally guarantees 100% Drop-in Interchangeability for all single and multiple-section gear pumps across SAE mounting flanges, drive shaft extensions, port dimensions, and internal displacements. Supported by our uncompromising 100% Simulation Load Testing, every pump undergoes severe high-peak pressure validation and inter-stage seal verification prior to dispatch, ensuring highly efficient, silent, and interference-free multi-circuit power delivery for your heavy equipment.

Technical Specifications 

• Product Series: PGP500 Series Aluminum High-Pressure External Gear Pump (Includes PGP503, PGP505, PGP511, PGP517 frames)

• Representative Tandem Displacement (e.g., PGP517 Double): Front pump 16.0 cc/rev, Rear pump 16.0 cc/rev (Supports custom combinations from 16 cc to 70 cc/rev per section)

• Rated Continuous Pressure: Up to 250 bar (3625 psi), varying by specific displacement

• Max Intermittent Peak Pressure: 275 bar (3988 psi)

• Max Operating Speed: 3000 rpm

• Min Operating Speed: 500 rpm

• Rotation Direction: C (Clockwise) or Counter-clockwise

• Housing Material: High-tensile extruded aluminum alloy body mated with heavy-duty cast iron end covers

• Control & Drive Mode: Fixed fluid displacement, driven mechanically via standard SAE splined or parallel keyed shafts

• OEM Part Cross-Reference: Fully compatible with OEM part numbers such as 3339121207

Key Technical Advantages:

• High Power Density & Lightweight Architecture: Fabricated with specialized extruded aluminum profiles, these pumps weigh nearly 30% less than traditional all-cast-iron alternatives. The aluminum body also delivers exceptional thermal conductivity, aggressively lowering system fluid temperatures during high-frequency mobile operations and boosting overall energy efficiency.

• Highly Modular Multi-Section Capabilities: The PGP500 series (especially PGP517 and PGP511) excels in tandem expandability. Utilizing high-torsion inter-stage splined couplings, they can be seamlessly configured into double or triple pumps. This allows a single prime mover to simultaneously supply independent hydraulic circuits (e.g., steering, lifting, and fan drives).

• Dynamic Pressure-Compensated Thrust Plates: Internally equipped with precision bronze-alloy, semi-balanced pressure compensation side plates. System pressure automatically forces these plates against the gear faces, dynamically adjusting axial clearances in real-time. This mechanism sustains a volumetric efficiency above 93%, even under continuous 250 bar loads.

• Low Pulsation Precision Gear Profile: The small-module, high-tooth-count internal gears are shaped and finished using ultra-precise CNC micro-grinding. This ensures smooth mesh transitions and virtually eliminates trapped oil phenomena, drastically dampening high-pressure pulsation and reducing aerodynamic fluid noise for a quieter operator cabin.

Application Areas:

• Earthmoving & Construction: Main working circuits and pilot systems for skid steer loaders, mini, and compact excavators.

• Agriculture & Forestry: PTO-driven multi-valve supply sources for medium/large tractors, and header lift circuits for combine harvesters.

• Material Handling: Independent dual-circuit control for lifting and steering in Aerial Work Platforms (AWP), forklifts, and reach stackers.

• Municipal & Commercial Vehicles: Hydraulic sources for rotary brush motors on street sweepers, cooling fan drives, and refuse compactor systems.

Expert Maintenance Tips:

• Tandem Pump Suction & Priming: Double or multiple pumps like the PGP517+517 draw a massive volume of fluid. The suction line must be perfectly unrestricted, and inlet vacuum must strictly remain above 0.8 bar (absolute). During initial startup, never apply a load immediately. Pre-fill the pump casing with clean fluid and jog the motor to bleed air from all inter-stage cavities, preventing dry-running damage to the inter-stage bearings.

• Backpressure & Shaft Seal Protection: In multi-section setups, return or drain lines from the front section must never generate excessive backpressure. Sudden pressure spikes can easily invert the front shaft seal lip or rupture the inter-stage seals, leading to catastrophic cross-chamber fluid contamination.

• Fluid Cleanliness Standard: To protect the precision aluminum bore and bronze thrust plates from premature abrasive wear, it is highly recommended to maintain system fluid cleanliness at ISO 4406 19/17/14 or better. Adhering to this will effectively double the operational lifespan of the gear pump.