Eckerle 890-EI Series High Pressure Internal Gear Pump Replacement

The 890-EI series (encompassing heavy-duty high-displacement configurations including 890-EI-0400, 890-EI-0630, 890-EI-0800, and 890-EI-1000) high-pressure internal gear hydraulic pumps manufactured by LIC Hydraulic—featuring the specialized technical execution code 890-EI-0630-RS2-C313—are premium, ultra-low noise rotary fluid power units custom-engineered for modern industrial servo-driven systems, heavy forging machinery, and high-precision injection molding processes. Conforming precisely to standardized industrial rectangular mounting pilots, straight keyed drive shafts, metric/SAE standard split-flange connection ports, and dual-gap volumetric efficiency compensation matrices, this entire pump line provides 100% drop-in interchangeability with Eckerle 890-EI series high-pressure internal gear pumps.

Under continuous high-pressure cycles, extended pressure-holding phases, or rapid start-stop variable speed operations driven by high-torque servo motors, standard external gear pumps frequently suffer from excessive bearing deflection and heavy gear-tip leakage. This can lead to a drastic decline in volumetric efficiency, alongside disruptive fluid pulsations and high-frequency noise. LIC addresses these operational faults by mastering the radial multi-segment sealing poppet system and floating crescent-plate pressure compensation technology inherent to the 890-EI design. Every single internal gear pump undergoes 100% full-load factory testing that simulates high-frequency servo variable acceleration and extreme holding pressures prior to shipment. Sustaining a high volumetric efficiency above 95% at an intermittent peak pressure threshold of 300 bar with low airborne noise, our pumps present a robust procurement alternative for global B2B industrial suppliers, servo-system integrators, and heavy machinery workshops.

Technical Specifications

Accurate, catalog-verified technical engineering profiles in compliance with standard Eckerle 890-EI series technical benchmarks:

• Product Series: 890-EI Series High-Pressure Internal Gear Pump Platform (Heavy-Duty Industrial Type)

• Displacement Sizing Framework Categories:

  • 890-EI-0400: Geometric nominal displacement of 40.0 cm³/rev.

  • 890-EI-0630: Geometric nominal displacement of 63.0 cm³/rev (Core profile: 890-EI-0630-RS2-C313).

  • 890-EI-0800: Geometric nominal displacement of 80.0 cm³/rev.

  • 890-EI-1000: Geometric nominal displacement of 100.0 cm³/rev.

• Model Number Specification Code Breakdown (890-EI-0630-RS2-C313):

  • 890: Primary classification index for heavy-duty high-displacement internal gear pumps.

  • EI: Internal gear technical mesh design (Internal Gear Design).

  • 0630: Nominal volumetric scaling code representing 63.0 cm³/rev geometric displacement.

  • R: Clockwise (CW) rotation orientation evaluated looking directly onto the shaft end.

  • S2: Main service ports configuration, standard SAE 4-bolt high-pressure split-flange porting.

  • C313: Customized drive shaft and mounting front-shroud designation (Standard straight cylindrical shaft with parallel key, matching standard industrial servo motor couplings).

• Nominal Continuous Operating Pressure Limit: 250 bar (25 MPa / 3625 psi)

• Intermittent Maximum Peak Pressure: 300 bar (30 MPa / 4350 psi)

• Allowable Operational Rotational Speed Range: 300 rpm – 2500 rpm (Optimized for variable speed electric servo setups).

• Fluid Operating Thermal Window: -10°C to +80°C.

• Maximum Full-Load Airborne Sound Level: Regulated between 65-68 dB(A) under a full 250 bar loading phase, delivering near-silent operational environments.

• Net Individual Mass Weight: 890-EI-0630 frame execution approx. 32.0 kg (70.5 lbs).

Key Technical Advantages

• Dual Axial & Radial Gap Hydrostatic Compensation System: The internal housing integrates floating axial compensation side plates paired with a multi-segment radial sealing poppet mechanism. As working line pressure rises, minor pilot fluid is routed behind the plates and into the crescent core, forcing the sealing boundaries into tight contact. This compensation force scales with system pressure, sealing internal bypass leakage and maintaining a volumetric efficiency above 95% up to 250 bar.

• Optimized Involute Gear Profile with Zero Pressure Ripple: The internal ring gear and external pinion utilize a specialized involute geometry with a low tooth-difference arrangement to maximize the mesh contact ratio. The smooth squeezing transition within the sealed trapping zones minimizes flow and pressure pulsations. This protects downstream servo valves from control instabilities and eliminates high-frequency pipeline vibrations.

• Heavy-Duty Fluid-Film Hydrodynamic Journal Bearings: The central rotating group is supported by bi-metal composite journal sliding bearings that leverage hydrodynamic and hydrostatic effects to secure a continuous oil film layer. The main chassis is cast from high-density ductile iron, offering excellent vibration absorption and resistance to mechanical thermal distortion even during rapid servo motor reversals.

• Golden Partner for Variable Speed Electro-Hydraulic Servo Drives: The fluid intake port is shaped with expanded cross-sections to maximize self-priming suction power, allowing the pump to build pressure stably at speeds as low as 300 rpm. The low-inertia internal components handle rotational angular accelerations up to 2000 ms², making it highly suitable for modern closed-loop energy-saving electro-hydraulic servo installations.

Application Areas

The 890-EI series high-pressure internal gear hydraulic pumps provide extended pressure-holding capacities, precise variable velocity behaviors, and low operational sound levels across industrial manufacturing:

• High-End Precision Injection Molding & Blow Molding Machinery: Serves as the primary servo-driven main pump managing high-frequency plastic injection profiles, fast clamp travel, and prolonged high-pressure mold-locking cycles.

• CNC Hydraulic Press Brakes & Stamping Assembly Lines: Supplying high-pressure fluid loops for four-column drawing presses and metal forming press brakes, demonstrating high operational stability during frequent cut-offs.

• Aerospace Testing Benches & Automotive Assembly Stations: Driving high-accuracy industrial component assembly presses and multi-axis servo actuator testing platforms that require strict laboratory low-noise conformity.

• Heavy Rubber Vulcanization & Specialized Footwear Machinery: Powering multi-station rotary shoe manufacturing equipment and high-tonnage rubber compression installations.

Expert Maintenance Tips

• Pre-Priming the Pump Casing Assembly is Mandatory Prior to First Turn: Internal gear pumps require liquid presence upon initial rotation to establish a suction vacuum seal and secure the hydrodynamic lubrication layer for the sliding journal bearings. Before turning on a newly installed unit (such as 890-EI-0630-RS2-C313), fill the pump housing completely with clean anti-wear hydraulic oil through the primary porting connections. Never run the servo motor dry; doing so will gall the bi-metal side plates and crescent faces within seconds.

• Enforce Zero Air Ingress Protocols Along the Suction Plumbing: Internal gear designs are sensitive to fluid aeration. Loose suction flange bolts or low reservoir oil levels that allow air to enter the intake port will trigger intense bubble implosions (cavitation) inside the high-pressure zone. This generates loud metallic knocking noise and can pit the gear tips and crescent boundaries, causing loss of pressure capabilities.

• Maintain Rigid Cleanliness Standards to Protect Precision Compensation Seals: Because the 890-EI platform contains intricate axial side plates and radial sealing poppets, solid particulate contamination can wedge into the sliding clearance zones. If a compensation segment becomes jammed by debris, the automatic gap management fails, leading to heavy internal fluid bypass, rapid heat generation, and component wear. Equip the system with high-efficiency return filtration to maintain oil parameters to ISO 4406 17/15/12 (NAS Class 6) or cleaner.