PGP517 Series Parker Replacement Tandem Hydraulic Gear Pump

The PGP500 and PGP517 series tandem high-pressure external hydraulic gear pumps manufactured by LIC Hydraulic (specifically denoted by standard configuration code: PGP517B0380CD1H3NL3L2S-517A0230NL3L2B1B1) are premier, high-durability fluid power units engineered for multi-circuit off-highway and heavy-duty industrial machinery. Complying fully with international SAE mounting standards, shaft keyways/splines, port layouts, and high-pressure performance characteristics, this series delivers 100% drop-in interchangeability with original Parker Hannifin PGP517/PGP511 tandem assemblies.

Designed as a dual-section hydraulic pump, it facilitates independent fluid pathways for front section (38.0 cm³/rev) and rear section (23.0 cm³/rev) displacement from a single primary input drive. This layout is perfect for isolating work and steering circuits or powering complex fast/slow combination cycles. Backed by LIC’s commitment to quality, every tandem pump undergoes 100% full-load simulated operational factory testing, duplicating severe field load spikes to guarantee unmatched volumetric sustainability and premium mechanical life for global B2B distributors and OEMs.

Technical Specifications

Accurate engineering profile based on standard manufacturer coding for the PGP517 dual pump configuration:

• Product Series: PGP500 / PGP517 Series Tandem External Hydraulic Gear Pump

• Complete Model Designation: PGP517B0380CD1H3NL3L2S-517A0230NL3L2B1B1

• Front Pump (P1 Section) Displacement: 38.0 cm³/rev

• Rear Pump (P2 Section) Displacement: 23.0 cm³/rev

• Front Section Continuous Operating Pressure: 250 bar (3625 psi)

• Rear Section Continuous Operating Pressure: 250 bar (3625 psi)

• Maximum Intermittent System Peak Pressure: 275 bar (4000 psi)

• Maximum Continuous Rotational Speed: 2400 rpm

• Minimum Stable Operating Speed: 500 rpm

• Drive Shaft & Flange Format: Standard SAE spline shaft and SAE 2-bolt/4-bolt flange arrangement (as defined by CD designation)

• Structural Material Specifications: High-tensile extruded aluminum alloy body paired with cast iron mounting flanges and rear covers

• Recommended Fluid Medium: Mineral-based anti-wear hydraulic fluids (ISO VG32 or VG46)

• Net Unit Weight: Approx. 12.3 kg (27.1 lbs)

Key Technical Advantages

• Heavy-Duty Extruded Aluminum & Interlocking Body Architecture: The center housings are crafted from aerospace-grade, high-tensile extruded aluminum alloys, while the front flanges and rear adapters are cast from dense, wear-resistant ductile iron. Utilizing an advanced interlocking bolt structure, the assembly delivers massive rigid resistance against pressure-induced housing expansion, preserving structural integrity under 250 bar loads.

• Hydraulically Pressure-Balanced Thrust Plates: Internal distribution plates employ an advanced axial pressure-balance design. Real-time fluid pressure is channeled beneath the thrust surfaces, applying a calibrated, micron-level force against the gear faces. This keeps internal clearances sealed tight, ensuring a high volumetric efficiency above 93% even under thermal system spikes.

• High-Load Hydrodynamic Journal Bushings: Replacing failure-prone needle bearings, LIC integrates one-piece heavy-duty journal bushings fabricated from multi-layer low-friction composite alloys. The enhanced surface contact area effectively distributes extreme radial and axial mechanical loads, vastly raising the fatigue limits of the pump under rapid pressure fluctuations.

• 12-Tooth Low-Ripple Precision Gear Geometry: The alloy steel gear sets are case-hardened and precision-ground using state-of-the-art CNC grinding profiles. Featuring an optimized 12-tooth asymmetric configuration paired with integrated flow relief slots in the housing, fluid entrapment is neutralized, smoothing out pressure ripples and decreasing audible noise emissions by 3-5 dB(A) compared to industry alternatives.

Application Areas

The PGP517 double pump setup excels in systems requiring dedicated dual-volume fluid paths without installing separate auxiliary gearboxes:

• Construction & Earthmoving Machinery: Compact wheel loaders, backhoes, and mini-excavators where independent flow is mandated for main boom kinematics and pilot-operated control circuits.

• Agricultural & Forestry Equipment: Mid-to-high horsepower tractors and combine harvesters for separating primary lift implement controls from hydrostatic steering loops.

• Sanitation & Municipal Fleet Vehicles: Rear-loading refuse compactors (utilizing the large volume for rapid blade cycles and the smaller volume for container lifting mechanisms) and street sweepers.

• Industrial High-Pressure Power Units (HPUs): Scrap metal balers, compactors, and manufacturing machinery needing smooth, efficient high-flow rapid advance and low-flow crushing transitions.

Expert Maintenance Tips

• Verify Adequate Suction Line Capacities: Because this tandem pump draws a high cumulative volume of fluid, the inlet pipe diameter must be sufficiently scaled to keep intake velocities below 1 m/s. Prior to initial cold-weather startups, pre-prime both the front and rear internal chambers with clean oil via the port openings to completely mitigate the risk of inlet cavitation and pitting wear.

• Enforce Strict Radial Alignment Constraints: When mating the master spline shaft to the electric motor or engine flywheel coupler, ensure that both radial and axial concentricity runouts are strictly calibrated within 0.1 mm. Excessive misalignment applies heavy overhung loads that cause premature bushing wear and internal gear tracking failures.

• Implement High-Standard Dual-Circuit Return Filtration: Since multi-section gear pumps supply fluid across diverse mechanical loops, contamination from one actuator can easily circulate back into the tank. Keep system cleanliness properties tightly managed to ISO 4406 19/16/13 specifications or cleaner, deploying high-capacity 10-micron absolute filtration media containing magnetic cores.