HYD-RK2120HNB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI Nickel

HYD-RK2120HNB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI Nickel

• HYD-RK2120HNB-DD is a compact, belt-free hydraulic drive package that
  directly couples a low-speed/high-torque (LSHT) hydraulic motor to an
  Annovi Reverberi RK2120HNB triplex plunger pump on a rigid,
  alignment-stable base.
• Delivers approximately 5.5 GPM @ 2900 PSI (≈21 L/min @ 200 bar) near
  1450 RPM in tight skids, service trucks, enclosed vans, and plant carts.
• Direct-drive geometry keeps shaft centerlines true, reducing side loading on
  bearings and seal packs so the assembly runs cooler, quieter, and longer than belt
  systems.

Corrosion-Ready Water End

• Features an HNB nickel-plated brass head for added chemical and
  wash-down resistance in hot, wet, or aggressive environments.
• Pump is engineered and built by Annovi Reverberi (AR) in Modena,
  Italy—industry leader in pump quality since 1958.

Direct-Drive & Hydraulic Motor

• Direct-drive geometry: no belts, no re-tensioning, and less guard
  bulk; coaxial motor-to-pump alignment reduces vibration, heat, and side loading.
• Hydraulic motor type: LSHT hydraulic motor; brand varies by build so
  fleets can standardize on a preferred supplier.
• Motor displacement is matched to reach ≈1450 RPM under load at the 2900-PSI duty
  point for smooth torque and steady pressure with calm trigger cycling.

Hydraulic & Pump Connections

• Hydraulic ports (typical): SAE-12 ORB (3/4″) pressure/return with
  auxiliary SAE-8 ORB (1/2″) case drain when required by the motor build.
• Observe A/B orientation for correct rotation; route the case drain above reservoir
  oil level, size hose IDs generously, and respect bend radii to avoid restriction.
• Pump ports: RK-series manifolds in this class are typically
  1/2″ F-BSPP inlet and 3/8″ F-BSPP outlet; adapters
  to NPT are readily available.
• Keep suction plumbing short, straight, and oversize from a flooded feed; use
  anti-collapse suction hose and a coarse inlet strainer to protect volumetric
  efficiency and prevent cavitation.

Installer-Friendly Layout

• Perimeter space for an unloader block without tight bends plus tidy pressure and
  bypass routing.
• Clear sight to the coupling, oil sight glass, and vented dipstick so a single tech
  can complete pre-start checks and PM with common tools.
• AR pumps ship pre-filled with oil for quick commissioning.

Integration Checklist HYD-RK2120HNB-DD

• Match motor displacement and available hydraulic flow to the target pump RPM using
  rpm ≈ 231 × hydraulic gpm ÷ motor displacement (in³).
• Confirm torque with lb-in ≈ displacement (in³) × psi ÷ 6.283 and
  hydraulic horsepower with hp ≈ gpm × psi ÷ 1714, applying realistic
  efficiencies.
• Set upstream reliefs correctly for 2900-PSI duty; specify 10–25 μm return filtration
  with an adequate β-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 and verify hose IDs, routing,
  and bend radii; never overspeed the pump.

Controls & Protection HYD-RK2120HNB-DD

• Use an adjustable unloader and a correctly sized
  high-pressure relief for 2900-PSI service.
• Add a glycerin-filled pressure gauge for commissioning and
  diagnostics and a thermal relief on the bypass loop to protect
  seals during extended gun-closed operation.
• Select nozzle orifices to hold the 5.5 GPM / 2900 PSI working point
  without overspeeding the pump.

HYD-RK2120HNB-DD Applications

• Mobile wash skids and service-truck bodies for contractors and fleet maintenance.
• Municipal & DOT fleets, sanitation and wastewater equipment, and public-works
  support.
• Food & beverage wash-down and sanitation (follow local hygienic standards),
  marine and shipyard cleaning, and dock washdown.
• Equipment-yard rinse stations, rental turn-backs, plant maintenance carts, and
  conveyor/parts-cleaning cells.
• Contractor rigs and systems that already carry hydraulic power and need a tidy,
  professional motor-driven pressure-wash solution.

HYD-RK2120HNB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI Nickel

• Compact direct-drive footprint with predictable, repeatable OEM geometry and hose
  routing.
• Quieter running with less vibration and alignment-stable layout that helps extend
  seal and bearing life.
• Single-tech preventive maintenance thanks to open access to fasteners, coupling,
  sight glass, and dipstick.

Ownership & Warranty

• Manufacturer: Annovi Reverberi (AR), pumps made in Modena, Italy,
  shipped with oil and a vented dipstick.
• Pump is covered by an AR 5-year limited, conditional warranty;
  proper hydraulic and water-side installation, correct filtration and lubrication,
  and operation within published limits are required for coverage.
• Normal wear items such as seals and valves are considered consumables.

HYD-RK2120HNB-DD Hydraulic Motor Pump | 5.5 GPM 2900 PSI Nickel

• Water performance: ≈5.5 GPM @ 2900 PSI near 1450 RPM
• Hydraulic motor: LSHT type (brand and displacement matched)
• 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
• Use case fit: skid and trailer packages, service trucks, plant carts,
  municipal and rental fleets, and contractor systems needing a compact hydraulic
  motor-driven AR pump package.