RKV4G35D-F24C2I | 3.5 GPM 3000 PSI Triplex Pump Unloader Installed

RKV4G35D-F24C2I by Annovi Reverberi — RK Series Triplex Plunger Pump with Gymatic Unloader and Chemical Injector | 4.0 GPM | 3,500 PSI | Bronze Connecting Rods | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive

The RKV4G35D-F24C2I by Annovi Reverberi is a professional-grade RK Series triplex ceramic plunger pump engineered for gas and diesel engine-driven commercial and industrial pressure washing systems requiring 4.0 GPM high-volume output at 3,500 PSI with integrated downstream chemical application capability. Rated at 4.0 GPM and 3,500 PSI at 3,400 RPM, the RKV4G35D-F24C2I delivers 14,000 cleaning units — combining the high-volume coverage speed of 4.0 GPM with 3,500 PSI pressure output that cuts through heavy contamination, grease, grime, and road film more aggressively than standard 3,000–3,200 PSI platforms — through a reinforced crankcase with bronze connecting rods, solid ceramic plungers, and an F24 SAE J609A direct-drive flange for close-coupling to gasoline or diesel engines.

The RKV4G35D-F24C2I is built on the RK Series platform — AR’s industrial pump architecture with front-access piston packing and valve assemblies for simplified field maintenance. The Gymatic (C2) unloader with integrated downstream chemical injector delivers the complete two-mode wash platform — high-pressure rinse and low-pressure detergent pre-soak — through a single factory-configured assembly that simplifies system design and eliminates the need for additional external injector hardware. At 3,500 PSI the C2 Gymatic operates with a comfortable 150 PSI of headroom below its 3,650 PSI rated ceiling — well within AR’s accepted variance for reliable bypass regulation.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated AR North America technical support — the RKV4G35D-F24C2I arrives as a complete, factory-tested assembly. Pre-filled with AR break-in oil, equipped with a Gymatic unloader and active downstream chemical injector, and packaged with mounting bolts and fasteners, a vented dipstick, operator’s manual, and full parts schematic, this pump is ready to install from the moment it arrives. Protected by a 5-year US limited warranty through AR North America and built to be fully rebuilt rather than replaced, the RKV4G35D-F24C2I is a long-term investment in a high-output RK Series commercial pump platform capable of a decade of productive service life.

Decoding the RKV4G35D-F24C2I Model Number

What Every Segment of This AR Pump Designation Tells You

• RKV — Pump series: RK Series triplex plunger pump — AR’s industrial pump platform with reinforced crankcase and front-access piston packing and valve serviceability for continuous commercial duty
• 4G35 — Performance rating: 4.0 GPM flow rate at 3,500 PSI maximum operating pressure — 14,000 cleaning units. The “4” prefix confirms 4.0 GPM; “35” encodes 3,500 PSI per AR model code convention.
• D — Shaft version: Direct Gas/Diesel Drive — 1″ hollow keyway crankshaft bore for direct coupling to gasoline or diesel engine 1″ output shafts
• F24 — Flange type: SAE J609A direct-drive flange for RK Series ‘D’ version pumps — close coupling to gas or diesel engines with a 1″ I.D. cylindrical shaft (AR part AR41866)
• C2 — Unloader code: Gymatic (C2 = Gymatic per AR suffix designation) — Gymatic 3/B series internal bypass unloader, brass body, adjustable pressure regulation, rated to 3,650 PSI. At 3,500 PSI the C2 provides 150 PSI of operating headroom — well within AR’s accepted upside variance for this pairing.
• I — Chemical injector: Included — a downstream soap and chemical injector is integrated into the Gymatic unloader assembly, enabling low-pressure detergent application without a separate injector fitting

Key Specifications

RKV4G35D-F24C2I Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 3,500 PSI
• Cleaning Units: 14,000 (GPM × PSI)
• Operating Speed: 3,400 RPM
• Pump Type: RK Series triplex ceramic plunger pump — three-piston crankshaft-driven design for smooth, consistent high-pressure output
• Crankshaft Bore: 1″ hollow keyway — direct engagement with gas or diesel engine 1″ output shaft
• Crankcase: Reinforced — heavy-duty construction for continuous commercial duty operation
• Manifold Material: Forged brass — dense, pore-free construction for corrosion resistance and sustained 3,500 PSI cycle integrity
• Plungers: Solid ceramic — exceptional hardness, wear resistance, and thermal shock resistance across extended commercial operating hours
• Connecting Rods: Bronze — premium fatigue strength and wear resistance at 4.0 GPM / 3,500 PSI continuous duty cycles
• Valves: Stainless steel — precise seating geometry, scale resistance, and reliable performance under continuous cycling
• Serviceability: Front-access piston packings and valve assemblies for simplified field maintenance
• Lubrication: Oil-bath crankcase lubrication with vented dipstick and sight glass
• Flange: F24 — SAE J609A direct-drive flange, RK Series ‘D’ version, 1″ shaft, gas and diesel engine compatible (AR part AR41866)
• Unloader System: Gymatic (C2 code) — brass-body internal bypass unloader with integrated downstream chemical injector, adjustable pressure regulation, rated to 3,650 PSI; 150 PSI operating headroom above 3,500 PSI output
• Chemical Injector: Included — downstream venturi injector integrated into Gymatic unloader assembly (“I” suffix confirmed)
• Warranty: 5-year limited warranty — US-based coverage through AR North America

What’s Included in the Box

A Complete, Factory-Configured RKV4G35D-F24C2I Assembly Ready for Installation

• Factory-installed Gymatic unloader (C2) with active chemical injector — pre-mounted and calibrated with integrated downstream injector ready for detergent supply line connection
• AR factory break-in oil — crankcase pre-filled to the correct operating level for first startup
• Vented dipstick — fast, accurate crankcase oil level checks with proper crankcase pressure relief
• Clear oil sight glass — at-a-glance visual verification of crankcase lubrication level
• Mounting bolts and fasteners — hardware sized for F24 SAE J609A direct-drive flange installation on compatible 1″ shaft gas or diesel engines
• Operator’s manual — complete installation, startup, operating, and maintenance procedures for the RKV4G35D-F24C2I including oil change intervals, packing and valve service guidance, chemical injector care, and winterization protocol
• Parts schematic — exploded-view diagram with AR part numbers for every serviceable RKV4G35D-F24C2I component
• Factory test certification — every RKV4G35D-F24C2I load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

Gymatic Unloader with Integrated Chemical Injection — Two-Mode 3,500 PSI Wash Platform

Pre-Soak, Degrease, and 3,500 PSI / 4.0 GPM Rinse Through the RKV4G35D-F24C2I

The Gymatic (C2) unloader with integrated downstream injector on the RKV4G35D-F24C2I simplifies system layout and eliminates the need for additional external injector hardware:

• Venturi-driven downstream injection — the injector integrated into the C2 Gymatic body draws detergent, degreaser, or pre-soak solution from a supply container when the RKV4G35D-F24C2I operator switches to low-pressure application mode. No separate injector hardware required.
• Two-mode workflow at 4.0 GPM / 3,500 PSI — chemical pre-soak breaks down grease, oil, and embedded contamination on fleet vehicles, industrial machinery, and commercial surfaces; full 3,500 PSI / 4.0 GPM rinse at 14,000 cleaning units removes loosened material efficiently. The 4.0 GPM flow rate rinses more surface area per minute than 3.0–3.5 GPM alternatives, reducing total wash cycle time on large-surface production jobs.
• No separate injector hardware required on the RKV4G35D-F24C2I — one assembly, two operating modes. Simplified system plumbing with fewer potential leak points.
• Adjustable then tamper-resistant — operating pressure locked before production, maintained consistently across every operator and every job cycle
• Smooth internal bypass at 4.0 GPM — trigger-off bypass smoothly redirects the full 4.0 GPM flow, preventing deadhead pressure spikes during idle intervals on production wash jobs
• Injector maintenance — flush the RKV4G35D-F24C2I injector circuit with clean water after every detergent session to preserve long-term venturi function as detailed in the included operator’s manual.

RK Series Construction — Built for 3,500 PSI High-Volume Continuous Duty

Solid Ceramic. Forged Brass. Bronze Connecting Rods. Front-Access Service.

• Solid ceramic plungers in the RKV4G35D-F24C2I resist abrasion, heat, scoring, and chemical attack at 3,500 PSI across extended commercial operating hours, protecting seals and extending service intervals. Individual replacement when service limits are reached — no full pump replacement required.
• Bronze connecting rods are engineered to handle high loads and sustained operating temperatures on the RKV4G35D-F24C2I, distributing stress evenly across the crankshaft and providing long-term fatigue resistance in continuous commercial duty environments
• Reinforced crankcase on the RKV4G35D-F24C2I maintains alignment and supports bearings under the sustained mechanical forces of 4.0 GPM / 3,500 PSI continuous operation, improving reliability and service life
• Forged brass manifold provides a dense, pore-free pressure vessel for sustained 3,500 PSI cycling and corrosion resistance in commercial cleaning environments
• Stainless steel check valves maintain precise seating geometry through high-cycle 3,500 PSI / 4.0 GPM operation, resisting scale and pitting that cause pressure loss over time
• Triplex three-plunger design produces smooth, overlapping pressure pulses that reduce pulsation-induced fatigue stress on hoses, spray guns, and fittings connected to the RKV4G35D-F24C2I

Front-Access Serviceability — RK Series Maintenance Advantage

Packing and Valve Service Without Full Disassembly

• Front-access piston packings — packing replacement on the RKV4G35D-F24C2I is accessible from the front of the pump without requiring full crankcase disassembly, reducing time and labor for the most frequent seal maintenance event in high-cycle commercial operation
• Front-access valve assemblies — inlet and outlet valve inspection and replacement accessible without removing the RKV4G35D-F24C2I from the engine mount in most installations, enabling valve service during scheduled maintenance windows
• Reduced maintenance downtime — shorter service windows translate directly into faster return to productive operation for contractor rigs and commercial wash operations running the RKV4G35D-F24C2I at high output daily

F24 SAE J609A — Direct Drive for Gas and Diesel Engines

• Gasoline engine compatibility — direct bolt-up to commercial gas engines with a 1″ cylindrical output shaft and SAE J609A bolt pattern in the horsepower class appropriate for 4.0 GPM / 3,500 PSI loads on the RKV4G35D-F24C2I. Verify engine horsepower before installation.
• Diesel engine compatibility — equally compatible with standard diesel engines equipped with a 1″ crankshaft and SAE J609A bolt pattern for contractor rigs and industrial equipment
• Direct close-coupling — the RKV4G35D-F24C2I mounts face-to-face against the engine with the 1″ hollow keyway crankshaft bore engaging the engine shaft directly, eliminating belt guards, pulleys, and tensioning hardware
• Compact footprint — ideal for skid frames, trailer rigs, and OEM platforms with limited installation space
• Included mounting hardware — bolts and fasteners sized for the F24 SAE J609A bolt pattern are supplied in the box with the RKV4G35D-F24C2I

Typical Applications

Where the RKV4G35D-F24C2I Delivers Best Results

• Industrial equipment degreasing — removing oil, hydraulic fluid, and baked-on grime from machinery, production equipment, and manufacturing plant assets where 3,500 PSI and integrated pre-soak capability on the RKV4G35D-F24C2I handle maximum contamination
• Fleet and trailer washing — trucks, trailers, buses, and delivery vans where 4.0 GPM coverage speed and 3,500 PSI cleaning force with integrated chemical pre-soak handle heavy road film and grease efficiently
• Concrete and large surface cleaning — parking lots, shop floors, sidewalks, and loading docks where 14,000 CU output with two-mode chemical capability provides productive commercial cleaning results
• Agricultural machinery cleaning — tractors, harvesters, and farm implements in harsh environments where mud, manure, and crop residue require both maximum pressure and chemical pre-treatment through the RKV4G35D-F24C2I’s integrated injector
• Commercial properties and facilities — storefronts, garages, building exteriors, and outdoor work areas where the RKV4G35D-F24C2I’s two-mode wash capability simplifies daily cleaning workflows
• Mobile contractor rigs — trailer and skid-mounted systems where the RKV4G35D-F24C2I’s compact F24 direct-drive footprint, front-access serviceability, and integrated chemical capability support diverse daily field jobs

5-Year US Warranty, Full Rebuildability, and Wholesale Pricing

High-Output RK Series Performance Backed by Domestic Support

The RKV4G35D-F24C2I is protected by Annovi Reverberi’s 5-year limited warranty through AR North America’s US-based warranty and service network. Every internal wear component of the RKV4G35D-F24C2I — solid ceramic plungers, bronze connecting rods, forged brass manifold seals and o-rings, stainless valve seats and springs, Gymatic unloader service parts, piston packing kits, and crankcase bearings — is stocked domestically through AR’s authorized distribution channels.

With consistent maintenance — break-in oil change at 50 hours, scheduled oil changes every 500 hours or 3–5 months, regular valve and packing inspection using the front-access design, chemical injector circuit flushing with clean water after every detergent session, and proper winterization using RV-grade environmentally safe antifreeze — the RKV4G35D-F24C2I is engineered for 10 or more years of productive commercial service life. AR North America’s domestic parts depth ensures rebuild kits, plunger sets, packing kits, and Gymatic unloader service components for the RKV4G35D-F24C2I are typically available same-week.

Contractors, rental fleet operators, municipal purchasing departments, resellers, and volume buyers are invited to contact wholesale@wshpwr.com for wholesale and special pricing on the RKV4G35D-F24C2I and the complete Annovi Reverberi pump and unloader assembly line. WSHPWR maintains one of the most complete AR North America inventories available through any US web store — with thousands of AR products in stock and a continually expanding catalog.

14,000 Cleaning Units. 3,500 PSI. 4.0 GPM. RK Series. Gymatic Bypass. Integrated Chemical Feed.

Italian Engineering. High-Volume Two-Mode Platform. Front-Access Service. US Warranty Coverage.

For contractors, fleet operators, industrial maintenance teams, and OEM rig builders who need 4.0 GPM high-volume output at 3,500 PSI — with Gymatic bypass pressure regulation at a comfortable 150 PSI below the rated ceiling, integrated downstream chemical injection for two-mode wash capability, RK Series reinforced crankcase with front-access piston packing and valve serviceability, and bronze connecting rods — the RKV4G35D-F24C2I delivers a factory-tested, fully documented, and completely rebuildable assembly from one of the global pressure pump industry’s most trusted manufacturers. Fourteen thousand cleaning units. Direct drive. One-inch keyway shaft. Gymatic bypass with integrated injector. Front-access service design. Five years of US warranty. A decade of service life.

Volume buyers, resellers, and rental fleet operators can reach the WSHPWR wholesale team directly at wholesale@wshpwr.com to discuss pricing for quantity purchases across the complete Annovi Reverberi lineup — including pumps, unloader assemblies, and service parts.