AR22086 RK21.15 Hydraulic Pump | RK Series Replacement Pump

AR22086 | RK21.15 Hydraulic Pump | RK Series Replacement Pump | 5.5 GPM 2200 PSI

AR22086 RK21.15 Hydraulic Pump is the genuine Annovi Reverberi RK-series replacement pump for hydraulic drive systems built on the RK 21.15 platform, including the HYD-RK2115 pump and motor package. Rated at 5.5 GPM (21 L/min) and 2200 PSI (150 bar) at 1450 RPM, it is the highest-flow pump in AR’s compact RK frame — delivering roughly 40% more water than the 4 GPM RK models at the same working pressure, for faster rinsing and washdown on fleet, agricultural, municipal, and industrial equipment.

The AR22086 uses AR’s F38 close-couple architecture: the SAE A 82.55 two-bolt interface that mounts a hydraulic motor directly on the pump centerline with no belts, couplers, or bell housing. If you are repairing an existing HYD-RK2115 drive unit, transfer your hydraulic motor to this pump and the system returns to factory performance — your hydraulic supply requirement stays exactly the same because the motor does not change.

AR22086 Specifications

• • SKU: AR22086
  • Pump Model: Annovi Reverberi RK 21.15 H (228-series frame)
  • Replaces: Pump on the AR HYD-RK2115 hydraulic drive package

• Flow Rate: 5.5 GPM (21 L/min)
• Maximum Pressure: 2200 PSI (150 bar)
• Rated Speed: 1450 RPM
• Power Requirement: 7.9 HP (5.9 kW) shaft input at full duty, per AR’s published rating
• Drive Interface: F38 close-couple flange, SAE A 82.55 two-bolt; shaft Ø15.88 mm
• Inlet Ports: 1/2″ F
• Outlet Ports: 3/8″ F
• Maximum Fluid Temperature: 140°F
• Pump Head: Brass
• Plungers: One-piece ceramic
• Weight: Approximately 20 lbs (9.2 kg)

Hydraulic Motor Sizing

The AR22086 requires 7.9 shaft horsepower at 1450 RPM for full 5.5 GPM at 2200 PSI performance. On the factory HYD-RK2115 package, the matched motor draws approximately 7.7 GPM of oil at up to 2,538 PSI. Annovi Reverberi also publishes two gear-motor pairings for this pump: a 19cc gear motor drawing 31 L/min (8.2 GPM) at 141 bar (2,045 PSI), or an 11cc gear motor drawing 17 L/min (4.5 GPM) at 250 bar (3,626 PSI) — choose the displacement that matches your circuit’s available flow. For any other motor, size displacement to reach 1450 RPM using RPM ≈ 231 × hydraulic GPM ÷ motor displacement (in³) and confirm torque at your working pressure. Protect the motor with a properly set upstream relief valve, keep the return line low-restriction, and provide adequate oil cooling for continuous-duty washing.

Heavy-Duty RK-Series Construction

The AR22086 pairs a corrosion-resistant brass pump head with stainless-steel wet-end components built to resist wear, cavitation, and detergent exposure through years of continuous washdown service. One-piece ceramic plungers deliver superior heat dissipation and abrasion resistance, driven by a pressed high-strength steel crankshaft on oversized bearings for smooth, low-vibration operation. The die-cast aluminum crankcase carries an oil sight glass for quick level checks, and intake and delivery valves sit behind service plugs in the head for fast inspection or replacement without pulling the pump.

Installation Notes

Mounting is standard F38 practice: bolt the hydraulic motor to the flange, confirm rotation direction before commissioning, and secure the pump horizontally for stable, vibration-free operation. Keep suction plumbing short and unrestricted — flooded suction preferred — and pair the head with a properly sized unloader set against the 2200 PSI rating. Select nozzle orifices for the 5.5 GPM duty point; an undersized nozzle from a 4 GPM system will push the unloader into constant bypass and shorten seal life. Check crankcase oil at the sight glass before first start.

Quality Assurance & Maintenance

Every AR22086 is manufactured under Annovi Reverberi’s quality control standards and factory-tested for flow rate, pressure stability, and vibration before shipment. Routine maintenance is limited to scheduled pump oil changes, seal inspection, and periodic valve checks — the same service pattern as every RK-series pump, using standard AR repair kits. Follow winterization procedures during cold-weather storage to prevent freeze damage to the head and valves.

AR22086 Key Features & Applications

• Genuine AR RK 21.15 replacement pump — 5.5 GPM at 2200 PSI, 1450 RPM.
• Direct repair pump for the HYD-RK2115 hydraulic drive package; hydraulic supply requirement unchanged.
• Highest flow in the compact RK frame — faster rinsing than 4 GPM class pumps at the same pressure.
• F38 close-couple flange interface (SAE A 82.55) for belt-free direct motor mounting.
• Brass head, stainless wet-end components, and one-piece ceramic plungers for continuous duty.
• Serviceable valve plugs and oil sight glass for fast field maintenance.
• Ideal for fleet washdown, agricultural and municipal equipment, service trucks, and industrial cleaning rigs on the RK hydraulic platform.