RKA36G25E-F38 3.6 GPM 2500 PSI Hydraulic Pump | F38 Flange

RKA36G25E-F38 | Hydraulic-Ready Pump with F38 Flange | 3.6 GPM 2500 PSI | RKA Series

RKA36G25E-F38 is the value entry to hydraulic-drive washing: an Annovi Reverberi RKA-series triplex plunger pump rated at 3.6 GPM and 2500 PSI, supplied with the F38 close-couple flange installed — the interface that turns this hollow-shaft pump into a hydraulic drive unit waiting for its motor. The RKA line is AR’s high-volume workhorse family, built in enormous numbers for the pressure-washer trade, and the F38 conversion puts that proven, economical wet end onto the same hydraulic mounting system as the rest of WSHPWR’s drive units.

The duty point serves the light-commercial middle: 3.6 GPM at 2500 PSI washes trucks, equipment, stalls, and slabs at genuine commercial pressure while sipping both water and hydraulic power. For a utility tractor, compact machine, or service truck that needs capable washdown without an industrial-class budget — in dollars or in hydraulic horsepower — the RKA36G25E-F38 is the sensible specification.

RKA36G25E-F38 Specifications

• SKU: RKA36G25E-F38
• Configuration: Hollow-shaft pump with F38 close-couple flange installed — mounts your hydraulic motor directly (SAE A 82.55 two-bolt)
• Pump: Annovi Reverberi RKA-series triplex plunger pump, E-version hollow shaft
• Flow Rate: 3.6 GPM (13.6 L/min)
• Maximum Discharge Pressure: 2500 PSI (172 bar)
• Rated Speed: 1450 RPM class — the hydraulic motor sets actual speed; never exceed the pump’s plate rating
• Pump Power Requirement: Approximately 6.5 HP at full duty
• Inlet Port: 1/2″ F
• Discharge Port: 3/8″ F
• Maximum Fluid Temperature: 140°F
• Pump Head: Brass, with ceramic-coated plungers
• Drive Interface: F38 close-couple flange (SAE A 82.55), included and installed

Hydraulic Supply Requirements — Modest by Design

Full 3.6 GPM at 2500 PSI performance asks for only about 8 hydraulic horsepower — on the order of 5 to 8 GPM of oil at 1,500 to 2,300 PSI depending on the gear-motor displacement fitted to the F38. Nearly any auxiliary circuit qualifies: compact tractors, mini skid steers, utility machines, and light truck systems that could never host the big drive units run this pump without strain. Size the motor to the pump’s rated speed via RPM ≈ 231 × hydraulic GPM ÷ displacement (in³), protect RKA36G25E-F38with a relief at its rating, return the oil short and filtered to tank, and provide basic oil cooling for continuous duty. Call WSHPWR with your machine’s auxiliary flow and pressure and we will size the motor in one conversation.

The F38 Conversion Logic

AR’s F38 system is the common language of compact hydraulic drive: an SAE A two-bolt close-couple that puts the gear motor on the pump’s centerline with no belts, couplers, guards, or alignment. Factory-fitting that flange to the RKA’s hollow shaft does for this pump what it does across the range — but at the RKA’s price point, which is the story: hydraulic washdown capability at the most accessible cost of entry in the catalog. Builders standardizing on F38 hardware can move motors between this unit and the larger RK- and XM-class drives as fleets evolve, and the RKA’s ubiquity means seals, valves, and repair kits are stocked everywhere AR is sold.

RKA-Series Construction

The RKA carries AR’s proven light-commercial architecture: a corrosion-resistant brass head, ceramic-coated plungers for wear resistance, stainless valves, and a die-cast aluminum crankcase. It is the pump inside thousands of fielded pressure washers — a design refined by volume — and the E-version hollow shaft under the F38 flange keeps the drive connection simple and serviceable.

Installation & Operation Notes

Mount horizontally and confirm hydraulic motor rotation at commissioning. Feed the 1/2″ inlet from a flooded, filtered supply with short, unrestricted plumbing. Pair the discharge with an unloader set against working pressure, size the nozzle to 3.6 GPM at your target pressure — an oversized nozzle will not reach pressure at this flow — and respect the pump’s rated speed as the ceiling: the hydraulic motor’s displacement and your oil flow set the RPM, so verify it at commissioning. Winterize before cold-weather storage.

Quality Assurance & Maintenance

Every RKA36G25E-F38 ships factory-tested for flow rate, pressure stability, and vibration. Maintenance is the familiar RKA routine — crankcase oil changes, seal inspection, periodic valve checks — using the most widely stocked repair kits in the AR world, which keeps both parts cost and downtime at the bottom of the category.

RKA36G25E-F38 Key Features & Applications

• 3.6 GPM at 2500 PSI — genuine commercial washdown from the most economical hydraulic-ready pump in the range.
• F38 close-couple flange installed — bolt on a gear motor and the drive is complete.
• Runs on ~5–8 GPM of oil (~8 hydraulic HP) — nearly any auxiliary circuit qualifies.
• Proven high-volume RKA platform with the industry’s most available repair parts.
• F38 hardware interchanges with the larger RK- and XM-class drive units as fleets grow.
• Ideal for compact tractors and utility machines, light service trucks, farm and stable washdown, rental units, and budget-conscious hydraulic builds.