RKA4G40HNL-SX LH Triplex Pump | 4.0 GPM 4000 PSI

RKA4G40HNL-SX — Left-Hand Triplex Pump | 4.0 GPM, 4,000 PSI, 1,750 RPM

The Annovi Reverberi RKA4G40HNL-SX is a heavy-duty, commercial-grade left-hand (LH) triplex plunger pump engineered for high-pressure cleaning systems that require reverse-drive or mirrored shaft configurations. Rated at a true 4.0 gallons per minute and 4,000 PSI, this pump is designed to operate efficiently at 1,750 RPM, making it an ideal solution for industrial pressure washing, surface preparation, equipment cleaning, and professional wash systems operating under demanding conditions.

Built on Annovi Reverberi’s proven RKA platform, the RKA4G40HNL-SX combines high-pressure performance with rugged mechanical construction and long-term reliability. The inclusion of a factory-installed gearbox and a 24mm solid keyed left-hand shaft allows seamless integration into engines or motors where reverse rotation is required, eliminating the need for custom driveline solutions.

Overview

• Commercial and industrial triplex plunger pump designed specifically for left-hand shaft applications.
• Delivers 4.0 GPM at 4,000 PSI for demanding high-pressure cleaning tasks.
• Operates at 1,750 RPM for reduced heat, vibration, and component wear.
• Factory-installed gearbox ensures proper pump speed and smooth power transfer.
• Nickel-plated brass manifold provides durability in harsh, corrosive environments.

High-Pressure Performance at Controlled Speed

The RKA4G40HNL-SX is optimized for professional systems that require sustained high pressure without sacrificing pump life. Operating at 1,750 RPM, the pump runs cooler and smoother than high-speed designs, which helps reduce seal wear, bearing fatigue, and oil breakdown. This controlled speed makes it particularly well suited for continuous-duty applications where uptime and reliability are critical.

With a true 4,000 PSI pressure rating, this pump provides the cutting power needed for concrete cleaning, paint preparation, industrial degreasing, and heavy equipment maintenance. The 4.0 GPM flow rate offers an ideal balance between pressure intensity and rinsing efficiency, ensuring effective cleaning without excessive water consumption.

Left-Hand Shaft and Gearbox Configuration

A defining feature of the RKA4G40HNL-SX is its 24mm solid keyed left-hand shaft. This configuration is essential for systems where the engine or motor rotates opposite of standard pump orientation. Common use cases include mirrored skid layouts, specialty trailers, compact enclosures, and OEM systems where component placement dictates reverse rotation.

The factory-installed gearbox ensures correct pump rotation and speed reduction while maintaining precise alignment between the power source and pump. This eliminates the need for external belt drives or custom gear reductions, simplifying installation and improving overall system reliability.

• Shaft diameter: 24 mm
• Shaft type: Solid, keyed
• Shaft orientation: Left-hand (reverse rotation)
• Drive system: Integrated gearbox

Construction and Durability

• Nickel-plated forged brass manifold resists corrosion from water, detergents, and chemical exposure.
• Ceramic plungers provide low friction, excellent wear resistance, and extended seal life.
• Oversized precision bearings stabilize the crankshaft under continuous high-pressure loads.
• Stainless steel valves ensure consistent sealing and long-term reliability.
• Heavy-duty crankcase designed to dissipate heat and withstand industrial operating conditions.

Nickel-Plated Brass Manifold

The pump head is constructed from forged brass with a nickel-plated finish, offering both structural strength and enhanced corrosion resistance. This combination makes the RKA4G40HNL-SX well suited for use in humid environments, outdoor installations, and applications involving detergents or chemical cleaners.

Forged brass provides superior fatigue resistance under high-pressure cycling, while the nickel plating protects against oxidation and chemical attack. Smooth internal flow paths reduce turbulence, improving hydraulic efficiency and minimizing unnecessary stress on internal components.

Triplex Plunger Design Advantages

Unlike axial or wobble pumps, the RKA4G40HNL-SX utilizes a triplex plunger design with three plungers operating in sequence. This configuration delivers smoother flow, reduced pulsation, and more consistent pressure output.

Reduced pulsation helps protect hoses, unloader valves, and downstream accessories while also improving operator control at the spray gun. The balanced mechanical layout also reduces vibration and noise, contributing to longer pump and engine life.

Oil Management and Serviceability

Routine maintenance is simplified through thoughtful service features built into the pump. A vented dipstick maintains proper crankcase pressure, while an oil sight glass allows for quick visual oil level checks without disassembly.

Each pump ships factory-tested with break-in oil pre-installed, ensuring proper lubrication from first startup. Regular oil inspection and changes help maximize service life, particularly in continuous-duty or high-load applications.

• Oil sight glass for fast, accurate oil monitoring.
• Vented dipstick for balanced crankcase ventilation.
• Designed for predictable maintenance intervals.

What’s Included

• Factory-installed gearbox for simplified installation and alignment.
• Pre-installed break-in oil.
• Integrated vented dipstick and oil sight glass.
• Owner’s manual, exploded schematic, and factory performance test sheet.
• 5-year commercial warranty with U.S.-based support and service.

Ideal Applications

The Annovi Reverberi RKA4G40HNL-SX is ideally suited for industrial pressure washing, surface preparation, fleet maintenance, heavy equipment cleaning, and OEM systems requiring left-hand shaft orientation. Its combination of high pressure, controlled speed, gearbox efficiency, and rugged materials makes it a dependable choice for professionals who cannot afford downtime.

For applications that demand a true 4.0 GPM / 4,000 PSI triplex pump with left-hand rotation and long-term durability, the RKA4G40HNL-SX delivers proven performance backed by Annovi Reverberi’s commercial engineering expertise.