Rickmeier R2 Dual Hydraulic Gear Pump

Rickmeier R2-2.75/30DBI+2.75/24DBI-M0-S0 Hydraulic Gear Pump

The Rickmeier R2-2.75/30DBI+2.75/24DBI-M0-S0 is a dual-stage positive displacement external gear pump assembly engineered for critical marine propulsion lubrication, turbocharger lube skids, heavy reduction gearboxes, and high-reliability hydraulic circuits. Manufactured in Germany by RICKMEIER GmbH, this combination pump pairs two high-efficiency displacement stages into a single driven casing.

The primary stage delivers a nominal displacement rated around the 30 series geometry with an integrated internal pressure limiting bypass valve (DBI), coupled in tandem with a secondary 24 series displacement stage (24DBI). The unit features a specialized mechanical interface (M0) and custom construction envelope (S0), optimized for direct drive via electric motors, bell housings, or auxiliary power take-offs (PTO). With nitrided, case-hardened spur gear sets, hydrodynamic composite journal bearings, and precision flow channels, this unit guarantees quiet operation, low pulsation, and exceptional cavitation resistance under variable operating viscosities.

Model Details:

• Manufacturer Part Number (MPN): R2-2.75/30DBI+2.75/24DBI-M0-S0
• Series (R2): Rickmeier Size 2 modular industrial gear pump housing
• Stage 1 (2.75/30DBI): Size 2 displacement group, 30 cm³/rev nominal class displacement, integrated internal direct-acting pressure relief/limiting valve (DBI)
• Stage 2 (+2.75/24DBI): Tandem-coupled secondary stage, 24 cm³/rev nominal class displacement, independent integrated bypass relief valve (DBI)
• Drive Interface (M0): Flange-mounted direct connection with cylindrical keyed or specialized pilot drive shaft
• Configuration (S0): Standard factory custom multi-stage porting and sealing configuration

Key Features

1. Dual-Stage Tandem Integration: Provides dual independent oil circuits or combined high-volume flow from a single motor drive, reducing skid space, weight, and installation complexity.
2. Built-in DBI Safety Relief Valves: Both pump sections incorporate an internal, spring-loaded direct-acting pressure limitation valve that safeguards lines and seals from hydraulic shock and overpressure conditions.
3. Advanced Low-Noise Tooth Profile: Features custom involute gearing geometry that minimizes fluid trapped in the mesh, dampening pressure pulsations and drastically lowering dB(A) acoustic signatures.
4. Exceptional Dry-Run & Priming Capabilities: Straight-line inlet ports combined with hydrodynamic composite bush bearings ensure quick self-priming and safe cold-start lubrication under high fluid viscosities.
5. Rigid Heavy-Duty Casing: Engineered from high-density cast iron to withstand severe mechanical line stresses, marine hull vibration, and cyclic thermal expansion.

Equipment Compatibility

• Industrial & Marine Equipment Compatibility
  Marine Propulsion Gearboxes: Renk, Flender, Reintjes, Brunvoll, and ZF heavy marine transmission skids.
• Medium & High-Speed Marine Diesels: MAN Energy Solutions, Wärtsilä, Caterpillar/MaK, and Bergen lube/boost circuits.
• Compressors & Separators: Atlas Copco gas compressors, Alfa Laval / GEA Westfalia separation and lube filtration modules.
• Wind Energy & Turbines: Heavy yaw, pitch, and main transmission lubrication modules.

Applications

• Marine main engine bearing pre-lubrication and continuous forced oil circulation.
• Dual-line cooling and filtering skids (one stage for cooling loop, one stage for system pressure lubrication).
• Hydraulic power units (HPUs) driving marine deck winches, thrusters, and steerage gear.
• Industrial turbine and reduction gear continuous oil dosing systems.

Frequently Asked Questions

Can this Rickmeier dual-stage pump handle two different oil circuits simultaneously?

Yes. Because the R2-2.75/30DBI+2.75/24DBI-M0-S0 combines two distinct displacement sections, it can be plumbed to service two separate fluid lines—such as an oil cooling filtration loop on one stage and high-pressure journal bearing feed on the other—provided the inlet conditions and medium are compatible.

What is the primary difference between the 30DBI and 24DBI stages?

The numbers denote the nominal displacement volume per revolution (~30 cm³/rev vs ~24 cm³/rev). The DBI designation confirms that both stages include an integral direct-acting pressure limitation relief valve built straight into each respective cover or housing block.

Is rotation reversible on the Rickmeier R2 series?

Standard R-series pumps have a dedicated rotation direction (clockwise ‘R’ or counter-clockwise ‘L’) governed by internal porting passages. Unless specifically designated as a universal reversing type (UNI), running the pump in reverse will reverse the suction/pressure flow path and can rupture standard shaft seals. Always confirm input shaft rotation before powering the motor.

What maintenance is required for the internal journal bearings?

The hydrodynamic multi-layer composite journal bearings rely entirely on the pumped medium for lubrication and cooling. They require zero external greasing. To maximize bearing lifespan, ensure lube oil contamination is controlled with continuous fine filtration (nominal 10–25 micron).