GHPA3A GHPP3 Series High Pressure Hydraulic Gear Pump | Galtech Replacement

Genlu Hydraulic proudly introduces our GHPA3A, GHPP3, GHPA2, and GHPP1 Series industrial and mobile-grade high-pressure aluminum external hydraulic gear pumps. Engineered to deliver a continuous fluid volume flow under high operating strain, this line serves as a precision-manufactured, drop-in replacement for the classic Galtech (Walvoil) GH gear pump portfolio. We specialize in supplying and cross-referencing heavy-duty single pumps like GHPA3A-D-80-S1 as well as multi-stage tandem assemblies like GHPA3A-S-60-S1-D + GHPP3-S-30-D (constructed via high-rigidity internal splined couplings connecting a Group 3 front stage to a Group 3 rear stage).

Acting as the fundamental power component in municipal environmental haulers, mobile lifting machinery, and versatile industrial Hydraulic Power Units (HPUs), Genlu’s GH family conforms rigidly to European standardized and SAE blueprints. We guarantee 100% Drop-in Interchangeability across standard European flange pilots (e.g., $\phi 50.8$ setups), 1:8 tapered driven shafts, specialized spline shafts, manifold port distance tolerances, and modular multiple-pump bridging boundaries. Every unit is subjected to 100% full-pressure running-in, high-temperature efficiency analysis, and dynamic end-face tolerance testing, ensuring zero mechanical bypass and long-term deployment integrity under severe duty cycles.

Technical Specifications 

• Product Line: GH Series High-Pressure External Aluminum Gear Pump (Single & Tandem Builds)

• Core Covered Model Codes: GHPA3A-S-60-S1-D+GHPP3-S-30-D (Tandem Build), GHPA3A-D-80-S1 (Single Element Build)

• Frame Group Spectrum: Group 2 (e.g., GHPA2 layout) & Group 3 (e.g., GHPA3A / GHPP3 layout)

• Nominal Displacement Values:

  • 30 Variant (Group 3): 30 $cc/rev$

  • 60 Variant (Group 3): 61.5 $cc/rev$

  • 80 Variant (Group 3): 79.3 $cc/rev$

• Maximum Continuous Working Pressure: 250 bar (25 MPa)

• Intermittent Dynamic Peak Pressure: 280 bar (28 MPa)

• Allowable Shaft Speed Window: 600 rpm to 2800 rpm (Depending on displacement criteria and intake inlet vacuum constraints)

• Rotational Direction Orientations:

  • “D” Designation Code: Clockwise Rotation (CW, viewing from shaft extension)

  • “S” Designation Code: Counter-Clockwise Rotation (CCW, viewing from shaft extension)

• Drive Shaft Specification (S1 Suffix): Standard European 1:8 tapered shaft arrangement equipped with a woodruff key and locking nut

• Casing Construction Material: High-density extruded aluminum gear housing paired with heavy-duty cast aluminum front/rear flange caps

• Standard Volumetric Efficiency Bound: $\ge 95\%$ under a baseline 1500 rpm operational speed

Key Technical Advantages:

• Axial Hydrostatic Balance Floating Thrust Bushings: The pump core integrates floating aluminum thrust plates backed by specialized DU composite bushings. Under load, discharge fluid pressure actively pushes the thrust plates against the gear faces. This dynamic clearance compensation eliminates volumetric cross-port leakage, maintaining a $\ge 95\%$ efficiency at a full 250 bar.

• Aircraft-Grade Extruded High-Tensile Body Work: The central gear housing is extruded from aerospace-grade aluminum alloys, while the structural caps are cast from premium stress-rupture resistant metals. This configuration effortlessly withstands cyclical peak shear loads, preventing casing distortion or tracking track widening under massive pressure spikes.

• Shaved High-Precision Gears with Optimized Trapped-Oil Relief: The drive and idler gears are forged from high-alloy steel, case-hardened, and processed via advanced tooth-shaving machines to erase profile micro-deviations. Dual asymmetrical venting relief grooves machined onto the bearing plates prevent fluid encapsulation (“trapped-oil” impact), cutting fluid ripples and structure-borne hum.

• Zero-Leakage Modular Tandem Bridging Architecture: For complex tandem setups like the GHPA3A+GHPP3, the junction incorporates a high-strength splined joint coupled with high-pressure dynamic lip seals. This totally isolates individual fluid circuit media, allowing separate stages to manage independent pressure loads with zero inter-stage fluid mixing.

Application Areas:

• Mobile Environmental & Utility Equipment: Main power supply for urban refuse compactor multi-spool valves, road sweeps, and specialized dump truck multi-stage hoist cylinders.

• Material Handling & Logistics Platforms: Mast lift pumps for industrial forklifts, knuckle-boom truck cranes, tail gates, and compact dock leveling systems.

• Agricultural & Forestry Equipment: Primary hydraulic pump feed for combine harvester headers, tractor auxiliary linkages, and power steering modules.

Expert Maintenance Tips:

• Strictly Prohibit Impact Installation & Shaft Misalignment: Gear pump internal configurations are manufactured to micro-tolerances. When installing shaft adapters, pulleys, or couplings, NEVER use a hammer to drive components onto the shaft extension. Always use a professional press tool, and maintain radial/axial shaft alignment to within $0.05 mm$ to prevent premature thrust plate tearing.

• Mandatory Pre-Commissioning Fluid Priming: External gear profiles possess low self-priming boundaries when entirely dry. Prior to initial engagement, pre-fill the pump cavity with clean hydraulic oil through the inlet port. If the pump fails to discharge oil within 10 seconds of starting, immediately stop the prime mover to check for suction line kinks or filter blockages, avoiding instantaneous thrust plate galling.

• Enforce Tight Viscosity and Fluid Conditioning Lifecycles: Aluminum body wear rates accelerate under elevated thermal profiles; keep continuous operational tank levels regulated within 30°C – 60°C. Deploy premium anti-wear ISO VG 46 fluid charges. If fluid discoloration, emulsion, or high ISO particulate counts appear, replace the fluid charge immediately to avoid scuffing the internal housing paths.