HYD5530 Hydraulic Drive Kit | Triplex Pump

HYD5530 | Hydraulic Motor Pump Drive Unit | 5.5 GPM 3000 PSI | RK Series

HYD5530 refuses the compact class’s usual trade: an Annovi Reverberi RK-series drive unit delivering 5.5 GPM at up to 3000 PSI at 1450 RPM — the flow of the big RK frame and the pressure of the H-series heads, together. Most buyers in this class are handed a choice: the 5.5 GPM tier at 2200 PSI, or 3000 PSI capped at 4 GPM. This unit answers “both,” and does it from AR’s proven F38 close-couple architecture on hydraulics most machines already carry.

The combination reads directly as work rate. Against the 4 GPM / 3000 PSI workhorse, the HYD5530 puts nearly 40% more water on target at identical stripping pressure — mud, grease, and buildup leave in fewer passes, and a fleet washdown day shortens accordingly. Against the 5.5 GPM / 2200 PSI tier, it adds the pressure margin that turns rinsing capability into cleaning authority on construction equipment, agricultural machinery, and municipal fleets where the grime is measured in seasons.

HYD5530 Specifications

• SKU: HYD5530
• Configuration: Hydraulic drive unit — RK-class pump with close-coupled hydraulic motor (F38 interface)
• Pump: Annovi Reverberi RK 21.20-class high-pressure triplex plunger pump (228-series frame)
• Flow Rate: 5.5 GPM (21 L/min)
• Maximum Discharge Pressure: 3000 PSI (206 bar class)
• Rated Speed: 1450 RPM — never overspeed
• Pump Power Requirement: Approximately 10.5 HP at full duty
• Inlet Ports (2): 1/2″ F
• Discharge Ports (2): 3/8″ F
• Maximum Fluid Temperature: 140°F
• Pump Head: Brass, with one-piece ceramic plungers
• Drive Interface: F38 close-couple flange (SAE A 82.55)

Hydraulic Supply Requirements

Full 5.5 GPM at 3000 PSI performance calls for roughly 13 hydraulic horsepower — on the order of 8.2 GPM (31 L/min) of oil at approximately 2,870 PSI working pressure, consistent with AR’s published gear-motor pairing for the adjacent RK 21.21 model (198 bar at 31 L/min on the 19cc motor). Standard skid steer auxiliaries and truck systems carry the flow easily; the working pressure is the number to verify, since circuits that relieve near 3,000 PSI leave little margin above the motor’s demand. Protect the motor with a properly set relief, route return oil short and filtered to tank, and provide oil cooling for continuous trigger-on duty. Call WSHPWR with your machine’s auxiliary flow, pressure, and relief setting and we will confirm the match before you order.

Flow and Pressure, Priced Honestly

The HYD5530 is the clean-water muscle unit of the compact class, and its forged brass head is the correct specification for the water most fleets actually pump — dimensionally stable at pressure, corrosion-resistant in ordinary supply, and serviceable with AR’s standard kits. Operations running daily detergent programs, sanitation chemistry, salt exposure, or reclaimed water should ask about nickel-plated and stainless head options on this platform; WSHPWR will spec the armored build where the chemistry genuinely demands it, and this configuration everywhere it doesn’t — full performance without paying for plating the duty never stresses.

Direct-Drive Simplicity

The hydraulic motor mounts to the pump through AR’s F38 close-couple flange — one centerline, no belts, pulleys, guards, or field alignment, minimal side loading on bearings and seals, and output independent of the host machine’s engine speed. Motor and pump dismount independently at the flange when service calls, and the unit installs as a bolt-down package in cabinets, tool compartments, and skids.

RK-Series Construction

The 228-series frame carries a corrosion-resistant brass head with stainless wet-end components, one-piece ceramic plungers for heat dissipation and abrasion resistance, and a die-cast aluminum crankcase with oil sight glass. Intake and delivery valves sit behind service plugs in the head for inspection without dismounting the HYD5530 — the same architecture and repair kits as every RK pump in the field.

Installation & Operation Notes

Mount horizontally and confirm motor rotation at commissioning. Feed the inlet from a flooded, filtered supply with short, unrestricted plumbing. Fit an unloader set against working pressure, verify the hydraulic-side relief against the motor’s rating, and size nozzle orifices to the 5.5 GPM duty point — orifices carried from 4 GPM systems will spike pressure and park the unloader in bypass. Hold 1450 RPM as the ceiling and winterize before cold-weather storage.

Quality Assurance & Maintenance

Every HYD5530 ships factory-tested for flow rate, pressure stability, and vibration. Maintenance follows AR’s standard RK schedule — crankcase oil changes, seal inspection, periodic valve checks with AR repair kits — with the moderate frame loading at this duty point keeping intervals comfortably routine.

HYD5530 Key Features & Applications

• 5.5 GPM at 3000 PSI, 1450 RPM — flow and pressure together in the compact RK class.
• Nearly 40% more water than the 4 GPM tier at identical stripping pressure.
• Runs on ~8.2 GPM of oil (~13 hydraulic HP) — standard auxiliary circuits qualify.
• F38 close-couple direct drive; standard AR RK repair kits and service path.
• Forged brass head for clean-water duty; nickel-plated and stainless options available across the platform.
• Ideal for fleet and municipal washdown, construction and agricultural equipment cleaning, service truck systems, and contractor rigs that refuse the flow-versus-pressure trade.