HYD-RK2120NB-DD Hydraulic Pump | 5.5 GPM 2900 PSI

HYD-RK2120NB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI

• HYD-RK2120NB-DD is a compact, belt-free hydraulic drive package that
  couples a low-speed/high-torque (LSHT) hydraulic motor directly to an
  Annovi Reverberi RK2120NB triplex plunger pump.
• Delivers approximately 5.5 GPM at 2900 PSI in a tidy, professional
  layout that fits skids, service trucks, enclosed vans, plant carts, and utility
  platforms.
• Direct-coupled geometry keeps motor and pump on the same centerline, eliminating
  belts and bulky guards while reducing side loads on bearings and seal packs for
  cooler, quieter operation and longer service life.
• NB brass head is a durable, cost-effective choice for everyday
  industrial cleaning.

Manufacturer & Pump Details

• Pump HYD-RK2120NB-DD manufactured by Annovi Reverberi (AR), the category leader in
  quality since 1958; pumps are engineered and built in Modena, Italy.
• Ships ready for installation: AR pumps are pre-filled with oil and
  include a vented dipstick and sight glass for fast commissioning.

HYD-RK2120NB-DD  Hydraulic Motor & Ports

• Hydraulic motor type: LSHT hydraulic motor (gerotor/geroler or
  external-gear style; brand may vary) sized to reach approximately
  1450 RPM under load for stable pressure and calm trigger cycling.
• Hydraulic ports (typical): SAE-12 ORB (3/4″) pressure/return and
  SAE-8 ORB (1/2″) case drain when required by the chosen motor.
• Observe A/B orientation for correct rotation, route any case drain above reservoir
  oil level, size hose IDs generously, and respect bend radii to avoid restriction.

Pump Ports & Plumbing Envelope

• Pump ports (RK2120NB): 1/2″ F-BSPP inlet and 3/8″ F-BSPP outlet;
  adapters to NPT are readily available.
• Keep suction short, straight, and oversize from a flooded source with an
  anti-collapse suction hose and coarse inlet strainer to protect volumetric
  efficiency and prevent cavitation.
• Plumbing envelope anticipates real-world installs: short, direct suction; clean
  pressure and bypass sweeps; and perimeter room for an unloader block without tight
  bends.
• Technicians retain clear access to the coupling, oil sight glass, vented dipstick,
  and fasteners for quick preventive maintenance.

Integration Checklist

• Match motor displacement and available hydraulic flow/pressure to the target pump
  RPM:
  rpm ≈ 231 × hydraulic gpm ÷ motor displacement (in³).
• Verify torque:
  lb-in ≈ displacement (in³) × psi ÷ 6.283 and hydraulic horsepower:
  hp ≈ gpm × psi ÷ 1714, applying realistic efficiencies.
• Set upstream reliefs correctly for 2900 PSI duty.
• Specify 10–25 μm return filtration with an adequate beta rating.
• Size the reservoir for heat rejection (rule of thumb
  2–3× total system flow) and add an oil cooler for hot climates,
  prolonged bypass, or continuous duty.
• Include a case drain if the motor build specifies it; confirm hose bend radii; and
  never overspeed the pump.

Controls & Protection (Water Side)

• Use a correctly sized adjustable unloader matched to RK duty.
• Add a high-pressure relief and a
  glycerin-filled gauge for commissioning and diagnostics.
• Include a thermal relief on the bypass loop to protect seals during
  extended gun-closed operation.

Why Direct Drive

• Smooth torque transfer for stable pressure and calm trigger cycling.
• No belt tensioning, no belt dust, and less guard bulk for a cleaner, safer layout.
• Alignment-stable geometry that helps extend bearing and seal life.
• Compact footprint with predictable hose routing for repeatable OEM builds and fast
  pump swaps.

HYD-RK2120NB-DD  Industrial Applications

• Tug/work boats and marine docks, hydraulic-powered washdown at the pier or yard.
• Farming and ranch equipment wash; general agriculture cleanup.
• Food and beverage plants and sanitation lines (observe local hygienic standards).
• Work trucks and service bodies, conveyor and parts-cleaning cells, and plant
  maintenance carts.
• Municipal/DOT fleets and wastewater support, heavy-equipment yards and rental
  turn-backs, building services, and compact contractor rigs.

Ownership & Warranty

• AR water end is backed by a 5-year limited, conditional warranty.
• Coverage requires proper hydraulic and water-side installation, correct filtration
  and lubrication, and operation within published limits.
• Normal wear items such as seals and valves are considered consumables.

HYD-RK2120NB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI

At-a-Glance Specs

• Water performance: 5.5 GPM at 2900 PSI near 1450 RPM
• Pump head: NB brass for dependable durability
• Hydraulic motor: LSHT type, brand varies, displacement matched to duty
• Hydraulic ports: typically SAE-12 P/T, SAE-8 case drain (if required)
• Pump ports: 1/2″ F-BSPP inlet, 3/8″ F-BSPP outlet
• Mounting: rigid, alignment-stable base with technician-friendly access
• Includes: factory oil fill, sight glass, and vented dipstick