GPY-11.5R GPY-7R High Pressure Gear Pump | Premium Micro Gear Pump Replacement

Genlu Hydraulic proudly introduces our GPY and GPYZ Series industrial-grade micro high-pressure external hydraulic gear pumps. Masterfully engineered for hyper-compact fluid systems where structural real estate is severely limited yet elevated pressure transformation is demanded, this pump line is heavily utilized in micro hydraulic power packs, automated machine tool workholding clamps, logistic tail-lift mechanisms, portable rescue tools, and modern automated assembly equipment. This series serves as a premium-engineered, highly reliable, and exact drop-in replacement for standard global classic GPY series micro fixed displacement gear matrices. We specialize in cross-referencing and supplying the entire displacement profile, notably including the GPY-3R, GPY-4R, GPY-5.8R, GPY-7R, GPY-9R, GPY-10R, and GPY-11.5R formats, alongside specific custom internal variations such as 8R323B and 7Y01 specifications.

Serving as a robust “micro-power heart” in ultra-compact machinery enclosures, Genlu’s GPY/GPYZ pumps rigidly conform to international installation layouts. We guarantee 100% Drop-in Interchangeability across standard 2-bolt diamond compact flanges, standard tang/flat-ended drivers (or small parallel keyed shaft extensions), and versatile side-ported or rear-ported threaded oil connection interfaces. Prior to dispatch authorization, each micro gear pump assembly undergoes 100% full-rated-load volumetric efficiency logging, low-speed high-viscosity suction sealing audits, and structural pressure impulse verification, ensuring massive hydraulic energy output within a small footprint.

Technical Specifications 

• Product Line: GPY / GPYZ Series Fixed Displacement Micro High-Pressure External Hydraulic Gear Pump

• Geometric Displacement Configuration Matrix:

  • GPY-3R Layout: 3.0 $cc/rev$

  • GPY-4R Layout: 4.0 $cc/rev$

  • GPY-5.8R Layout: 5.8 $cc/rev$

  • GPY-7R / 7Y01 Layout: 7.0 $cc/rev$

  • GPY-9R Layout: 9.0 $cc/rev$

  • GPY-10R Layout: 10.0 $cc/rev$

  • GPY-11.5R Layout: 11.5 $cc/rev$

• Continuous Rated Operating Pressure: 20.0 MPa to 21.0 MPa (200 bar to 210 bar / 2900 psi to 3045 psi)

• Maximum Intermittent Peak Pressure Threshold: 25.0 MPa (250 bar / 3625 psi)

• Permissible Operational Shaft Velocity Envelope: Minimum 500 rpm; Maximum rated velocity 3000 rpm to 4000 rpm (excellent high-speed priming performance)

• Drive Shaft Options: Standard tang drive (flat end), cylindrical parallel keyed, or custom fine splines

• Rotation Designation Formats:

  • R Code: Clockwise Rotation (Right-Handed build, most standard commercial specification)

  • L Code: Counter-Clockwise Rotation (Left-Handed build)

• Average Unit Mass Weight: Approx. 1.2 kg to 1.8 kg (ultra-lightweight, compact structural footprint)

Key Technical Advantages:

• High-Strength Cast Iron Covers & Lightweight Aluminum Alloy Hybrid Architecture: The main pump housing is extruded from high-tensile aerospace-grade aluminum alloy to achieve strict geometric tolerances. The front and rear covers are molded from high-strength cast iron. This hybrid iron-aluminum-iron design delivers an ultra-lightweight profile while preventing the housing distortion and bolt stretching under 25 MPa loads common in all-aluminum micro pumps.

• Heavy-Duty DU Bushings & Axial Balance Seating: Incorporates premium DU composite slide bushings that maintain a very low friction coefficient under high-velocity, high-pressure cyclic loads. Hardened floating side thrust plates utilize a hydraulic pressure-balance cavity to provide automatic axial clearance compensation. This keeps the pump’s volumetric efficiency consistently above 93% under full working loads.

• Precision Shaved Gears and Noise-Dampening Relief Grooves: The internal drive and driven steel gears undergo precise CNC hobbing and shaving to ensure near-perfect involute contact. Specialized asymmetric unloading relief grooves machined into the side plates instantly vent fluid trapping pressures during gear engagement, keeping operation noise under 60 dB even at 4000 rpm.

• Superior High-Speed Self-Priming with Wide Viscosity Tolerance: The optimized intake flow paths feature high volumetric charging coefficients, creating a rapid negative pressure vacuum during low-pressure or high-velocity startups to prevent fluid cavitation. Thanks to its hard, abrasion-resistant internal clearances, this micro pump adapts exceptionally well to low-to-medium viscosity fluids, including light lubricating oils and machine tool cutting oils.

Application Areas:

• Micro Hydraulic Power Packs & Compact HPUs: Main fluid aggregate for commercial tail-lifts, scissor lifts, dock levelers, and compact material handling platforms.

• Advanced CNC Machine Tool Workholding Modules: Automated high-repetition chucking circuits, sliding carriage locks, and index table hydraulic clamp arrays.

• Portable Hydraulic Industrial Tooling & Rescue Gear: Compact power units for industrial hydraulic shears, steel rebar cutters, and portable high-pressure hydraulic jacks.

Expert Maintenance Tips:

• Carefully Verify Shaft Rotation on Close-Coupled Tang Drives: GPY pumps are frequently close-coupled inside small motor enclosures via a flat tang shaft. Before running the system, double-check that the motor rotation matches the pump’s build direction (e.g., a GPY-11.5R requires clockwise rotation). If reversed, high-pressure oil will immediately overwhelm the low-pressure shaft lip seal, forcing fluid into the electric motor housing, which can cause short circuits or winding failure.

• Pre-Wet the Internal Gear Mesh Prior to Initial Motor Startup: Never start the pump dry. In micro gear configurations, friction heat can build up within seconds. Before mounting the unit, pour clean hydraulic oil directly into the suction port and rotate the input shaft by hand several times. This ensures the internal gear teeth and DU bushings are pre-lubricated with a protective fluid film.

• Implement Strict Controls on Return-Line Filtration Quality: Because micro high-pressure pumps operate with tight micron-scale internal clearances, small hard particles or metal shavings can score the aluminum housing interior. This wear creates bypass tracks that significantly lower delivery pressure. Protect the system by installing a return-line filter rated at 20 microns or better, and clean the fluid reservoir regularly.