RKV4G35HD-F24C2 | 4.0 GPM 3500 PSI Triplex Pump Unloader Installed

RKV4G35HD-F24C2 by Annovi Reverberi — RK Series Heavy-Duty Triplex Plunger Pump with Gymatic Unloader | 4.0 GPM | 3,500 PSI | Bronze Connecting Rods | Reinforced Crankcase | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive | No Chemical Injector

The RKV4G35HD-F24C2 by Annovi Reverberi is a professional-grade RK Series heavy-duty 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 dependable Gymatic bypass pressure regulation and straight high-pressure water delivery. Rated at 4.0 GPM and 3,500 PSI at 3,400 RPM, the RKV4G35HD-F24C2 delivers 14,000 cleaning units — combining the high-volume coverage speed of 4.0 GPM with 3,500 PSI pressure output that handles heavy contamination, road film, grease, and large commercial surfaces more aggressively than standard 3,000–3,200 PSI commercial platforms — through a reinforced heavy-duty 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 RKV4G35HD-F24C2 HD (Heavy Duty) designation confirms the elevated internal construction standard — reinforced crankcase and bronze connecting rods — within the RK Series industrial pump architecture. The Gymatic (C2) unloader provides 150 PSI of operating headroom above 3,500 PSI — a comfortable, well-supported pairing within AR’s upside variance standard that delivers stable bypass regulation and reliable overpressure protection. No chemical injector — this pump delivers straight high-pressure water output for operators managing chemical delivery through a dedicated external system or operating on clean water pressure alone.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated AR North America technical support — the RKV4G35HD-F24C2 arrives as a complete, factory-tested assembly. Pre-filled with AR break-in oil, equipped with a Gymatic unloader, 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 RKV4G35HD-F24C2 is a long-term investment in a high-output RK Series commercial pump platform capable of a decade of productive service life.

Decoding the RKV4G35HD-F24C2 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 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
• HD — Heavy Duty specification: elevated internal construction standard — reinforced crankcase and bronze connecting rods for high-output continuous duty in demanding environments
• 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 standard for this pairing.
• No trailing I suffix — the model terminates at C2, confirming straight 3,500 PSI water output without an integrated downstream chemical injector

Key Specifications

RKV4G35HD-F24C2 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 heavy-duty triplex ceramic plunger pump — three-piston crankshaft-driven design for smooth, consistent high-pressure output
• Build Specification: HD (Heavy Duty) — reinforced crankcase and bronze connecting rods
• Crankshaft Bore: 1″ hollow keyway — direct engagement with gas or diesel engine 1″ output shaft
• Crankcase: Reinforced (HD) — 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 (HD) — 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; common AR wear parts
• 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, adjustable pressure regulation, rated to 3,650 PSI; 150 PSI operating headroom above 3,500 PSI output
• Chemical Injector: Not included — model terminates at C2 with no injector suffix
• Warranty: 5-year limited warranty — US-based coverage through AR North America

What’s Included in the Box

A Complete, Factory-Configured RKV4G35HD-F24C2 Assembly Ready for Installation

• Factory-installed Gymatic unloader (C2) — pre-mounted and calibrated; no downstream injector port on this RKV4G35HD-F24C2 variant
• 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 RKV4G35HD-F24C2 including oil change intervals, packing and valve service guidance, and winterization protocol
• Parts schematic — exploded-view diagram with AR part numbers for every serviceable RKV4G35HD-F24C2 component
• Factory test certification — every RKV4G35HD-F24C2 load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

HD Heavy Duty Construction — Reinforced Crankcase and Bronze Connecting Rods

Built for High-Output Continuous Commercial Duty at 3,500 PSI

The RKV4G35HD-F24C2 Heavy Duty specification elevates the internal construction at the two points most critical for sustained high-output commercial operation:

Reinforced Crankcase

• Structural rigidity under sustained load — the reinforced crankcase on the RKV4G35HD-F24C2 handles the combined mechanical forces of 4.0 GPM volume and 3,500 PSI pressure at 3,400 RPM, maintaining crankshaft and bearing alignment under vibration and thermal expansion cycles during continuous duty operation
• Bearing support and alignment stability — reinforced crankcase construction supports the crankshaft and bearings with enhanced rigidity, maintaining plunger bore alignment and preserving packing service life across high-cycle commercial operation
• Heat management — reinforced construction with appropriate thermal dissipation characteristics keeps operating temperatures at bearing and seal interfaces within the RKV4G35HD-F24C2’s design envelope during continuous high-RPM operation

Bronze Connecting Rods

• Fatigue strength at continuous duty — bronze connecting rods on the RKV4G35HD-F24C2 resist the repeated load cycling of 4.0 GPM / 3,500 PSI operation at 3,400 RPM, distributing force evenly across the crankshaft and extending connecting rod service life compared to aluminum alternatives
• Wear resistance at bearing interfaces — bronze’s tribological properties reduce wear at connecting rod bearing surfaces under the sustained load conditions of continuous commercial operation on the RKV4G35HD-F24C2
• Long-term rebuild value — as a fully rebuildable platform, the RKV4G35HD-F24C2’s bronze connecting rods reduce the frequency of crankcase component replacement across a decade of commercial service life

The Gymatic Unloader — 150 PSI Headroom at 3,500 PSI

Comfortable Regulation. Tamper-Resistant. Straight Water Output.

The Gymatic (C2) unloader on the RKV4G35HD-F24C2 is rated to 3,650 PSI — providing 150 PSI of operating headroom above the pump’s 3,500 PSI output. This 150 PSI margin is well within AR’s accepted upside variance and supports reliable, consistent bypass operation:

• 150 PSI operating headroom — the C2 Gymatic at 3,500 PSI operates comfortably within its rated envelope on the RKV4G35HD-F24C2, producing stable, responsive bypass regulation behavior across continuous production wash cycles
• Adjustable then tamper-resistant — operating pressure set on-site and locked before production operation, held consistently across every operator and every job cycle without re-adjustment or drift
• Smooth internal bypass at 4.0 GPM — trigger-off bypass smoothly redirects the full 4.0 GPM flow at 3,500 PSI, preventing deadhead pressure spikes during idle intervals on production wash jobs
• Overpressure protection — the C2 unloader on the RKV4G35HD-F24C2 protects hoses, spray guns, and downstream accessories from over-pressurization at trigger release throughout the operating range
• Flexible pressure range — C2 adjustment supports everything from lighter rinsing to full 3,500 PSI aggressive washdown, matching system pressure to different nozzles, surfaces, and cleaning tasks on the RKV4G35HD-F24C2
• No downstream injector port — the RKV4G35HD-F24C2 delivers straight 3,500 PSI water output. Chemical delivery managed externally through a dedicated downstream injector or soft wash system.
• Compatible with downstream external chemical injectors — the clean water output architecture on the RKV4G35HD-F24C2 is fully compatible with separately installed downstream chemical injectors when soap application is required for degreasing, sanitation, or pre-soak workflows

Common AR Wear Parts — Fleet Service and Multi-Pump Operations

Standardized Parts Inventory Across Multiple Units

The RKV4G35HD-F24C2 uses common AR wear parts that are shared across the RK Series pump family — a meaningful operational advantage for fleet service operations, commercial wash bay facilities, and OEM system builders managing multiple pump units:

• Shared packing kits — piston packing sets for the RKV4G35HD-F24C2 are compatible with other RK Series models at equivalent bore specifications, allowing a single parts inventory to support multiple pump units in a fleet or wash bay operation
• Common valve components — inlet and outlet valve seats, balls, and springs share part numbers across the RK Series, reducing the number of unique line items required in a service parts inventory
• Standard AR Gymatic service parts — C2 unloader service kits, o-ring sets, and seal components for the RKV4G35HD-F24C2 are available through AR North America’s domestic distribution network and compatible with other Gymatic-equipped pumps
• Simplified technician training — consistent wear part specifications across multiple RK Series units reduce the learning curve for service technicians maintaining a fleet of RKV pumps, improving service consistency and reducing errors

Front-Access Serviceability — RK Series Maintenance Advantage

Packing and Valve Service Without Full Disassembly

• Front-access piston packings — packing replacement on the RKV4G35HD-F24C2 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 RKV4G35HD-F24C2 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 RKV4G35HD-F24C2 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 RKV4G35HD-F24C2. 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 RKV4G35HD-F24C2 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 — direct coupling is 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 RKV4G35HD-F24C2

Typical Applications

Where the RKV4G35HD-F24C2 Delivers Best Results

• Fleet maintenance and commercial vehicle washing — trucks, trailers, buses, and delivery fleets where 4.0 GPM coverage speed and 3,500 PSI cleaning force handle heavy road film and grease at high throughput with chemical applied through a dedicated external system on the RKV4G35HD-F24C2
• Industrial facility wash bays — warehouses, plants, and distribution centers where the RKV4G35HD-F24C2’s continuous-duty HD construction, front-access serviceability, and common AR wear parts reduce maintenance downtime and simplify parts management
• Concrete and paved surface cleaning — sidewalks, parking lots, garages, and loading docks where 14,000 CU high-volume output provides productive commercial cleaning results
• Agricultural and heavy equipment cleaning — tractors, harvesters, implements, and farm facilities on gas or diesel engine-powered rigs where maximum volume at elevated pressure handles large surface areas
• Mobile contractor systems — trailer and skid-mounted rigs operating in continuous daily service where the RKV4G35HD-F24C2’s HD reinforced construction and front-access serviceability support maximum uptime
• Soft wash system rinse supply — the RKV4G35HD-F24C2 provides clean 3,500 PSI / 4.0 GPM rinse water while a dedicated soft wash proportioner manages chemical delivery independently
• OEM rig builders and system integrators — the RKV4G35HD-F24C2’s F24 direct-drive mounting, common AR wear parts, HD construction, and clean water output architecture support efficient multi-unit system design and simplified fleet service operations

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

Heavy-Duty RK Series Performance Backed by Domestic Support

The RKV4G35HD-F24C2 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 RKV4G35HD-F24C2 — 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 at the service frequency appropriate for 3,500 PSI continuous-duty cycles, and proper winterization using RV-grade environmentally safe antifreeze — the RKV4G35HD-F24C2 is engineered for 10 or more years of productive commercial service life. AR North America’s domestic parts depth — including the common AR wear parts shared across the RK Series — ensures rebuild kits, plunger sets, packing kits, and Gymatic unloader service components for the RKV4G35HD-F24C2 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 RKV4G35HD-F24C2 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. HD Construction. Common AR Parts. No Injector.

Italian Engineering. Heavy-Duty Platform. Front-Access Service. US Warranty Coverage.

For contractors, fleet operators, industrial facility managers, and OEM rig builders who need 4.0 GPM high-volume output at 3,500 PSI — with HD reinforced crankcase and bronze connecting rod construction for continuous commercial duty, Gymatic bypass regulation with comfortable 150 PSI headroom, common AR wear parts for simplified fleet service operations, RK Series front-access piston packing and valve serviceability, and straight water output for external chemical management — the RKV4G35HD-F24C2 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. HD construction. No fixed 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.