HYD-RK1520 Hydraulic Motor Pump Package | RK1520

HYD-RK1520 | Hydraulic Motor Pump Package | 4.0 GPM 3000 PSI

HYD-RK1520 Hydraulic Motor Pump Package couples an Annovi Reverberi RK 15.20 H triplex plunger pump to a direct-mounted Sauer Danfoss hydraulic motor on rigid mounting rails — the workhorse hydraulic drive unit of the RK line, rated at 4.0 GPM and up to 3000 PSI (206 bar) at 1450 RPM per AR North America’s published specifications. Running entirely off your machine’s existing hydraulic circuit, it delivers full commercial cleaning pressure on skid steers, tractors, utility and crane trucks, and OEM equipment with no gas engine, no electric motor, and no belts anywhere in the drive.

This is the platform behind AR’s complete hydraulic pressure washer kits and thousands of fielded washdown installations: proven, compact, and serviceable with standard RK repair parts. Where the HYD-RK1515 sibling tops out at 2200 PSI for everyday rinse work, the HYD-RK1520 brings genuine 3000 PSI-class capability for stripping mud, grease, and caked material off construction and agricultural equipment.

HYD-RK1520 Specifications

• SKU: HYD-RK1520
• Configuration: Hydraulic motor + pump package with mounting rails
• Pump: Annovi Reverberi RK 15.20 H solid-shaft triplex plunger pump (228-series frame)
• Flow Rate: 4.0 GPM (15.1 L/min)
• Maximum Discharge Pressure: 3000 PSI (206 bar), per AR North America
• Rated Speed: 1450 RPM
• Pump Power Requirement: 7.5 HP (5.6 kW) at full duty, per AR’s published rating
• Hydraulic Motor: Sauer Danfoss, direct-coupled; max 7.5 GPM at 2,500 PSI
• Motor Hydraulic Ports: 1/2″ inlet and outlet
• Pump Inlet Ports (2): 1/2″ F
• Pump Discharge Ports (2): 3/8″ F
• Maximum Fluid Temperature: 140°F
• Pump Head: Brass, with one-piece ceramic plungers
• Weight: Approximately 31 lbs

Hydraulic Supply Requirements

Your machine’s auxiliary circuit must deliver approximately 7.5 GPM of continuous oil flow to the Danfoss motor, at working pressure up to the motor’s 2,500 PSI rating — roughly 10 to 11 hydraulic horsepower at the full 3000 PSI water duty point. Standard-flow auxiliary circuits on skid steers, tractors, and truck PTO systems meet this comfortably; verify your relief setting protects the motor’s 2,500 PSI ceiling if your circuit runs higher. Annovi Reverberi also publishes gear-motor pairings for the RK 15.20 H pump for custom installations: a 19cc motor drawing 31 L/min (8.2 GPM) at 135 bar (1,958 PSI), or an 11cc motor drawing 17 L/min (4.5 GPM) at 239 bar (3,466 PSI). Keep the return line short and low-restriction back to tank, specify return filtration, and confirm oil cooling for extended continuous-duty washing. If available flow runs slightly below spec, the HYD-RK1520 runs proportionally slower — full rated water pressure still requires full supply pressure at the motor.

Direct-Drive Advantages

The HYD-RK1520 uses AR’s F38 close-couple architecture: motor and pump share one centerline inside a rigid flange interface, eliminating belts, pulleys, guards, and couplers along with the alignment drift and tension maintenance they bring. The result is lower vibration, minimal side loading on bearings and seals, cleaning performance independent of host engine speed, and a footprint compact enough for service bodies, trailers, and tight OEM layouts. The included mounting rails hold alignment through transport and daily operation.

Heavy-Duty RK-Series Construction

At the package’s core, the RK 15.20 H pump carries a corrosion-resistant brass head with stainless-steel wet-end components, one-piece ceramic plungers for heat dissipation and abrasion resistance, and a pressed high-strength steel crankshaft on oversized bearings. The die-cast aluminum crankcase includes an oil sight glass for quick level checks, and intake and delivery valves sit behind service plugs in the head for inspection or replacement without pulling the pump off the rails.

Installation & Operation Notes

Mount the rail assembly horizontally and confirm hydraulic motor rotation before commissioning. Keep suction plumbing short and unrestricted with flooded suction preferred, pair the discharge with a properly sized unloader set against your working pressure, and choose nozzle orifices for the 4.0 GPM duty point — an oversized nozzle will not reach pressure, and an undersized one drives the unloader into constant bypass. Check crankcase oil at the sight glass before first start, and winterize before cold-weather storage to protect the head and valves.

Quality Assurance & Maintenance

Every HYD-RK1520 package is built around a factory-tested Annovi Reverberi pump verified for flow rate, pressure stability, and vibration before shipment. Routine maintenance is limited to scheduled pump oil changes, seal inspection, and periodic valve checks using standard AR RK repair kits — and if the pump ever wears out ahead of the motor, the NPT-port AR26472 replacement pump restores the unit without repurchasing the drive components.

HYD-RK1520 Key Features & Applications

• Complete hydraulic drive unit — AR RK 15.20 H pump, Sauer Danfoss motor, and mounting rails, pre-coupled and aligned.
• 4.0 GPM at 3000 PSI, 1450 RPM — full commercial cleaning pressure from your hydraulic circuit.
• Requires approximately 7.5 GPM of hydraulic flow at up to 2,500 PSI; fits standard auxiliary circuits.
• F38 close-couple direct drive — no belts, pulleys, or couplers to maintain.
• Brass head, stainless wet-end components, and ceramic plungers for continuous duty.
• Serviceable with standard AR RK repair kits; AR26472 NPT replacement pump available for the repair path.
• Ideal for skid steer and tractor washdown, construction and agricultural equipment cleaning, utility and crane truck systems, hydro-excavation support, and OEM integration.