RKV4G35D-F24C2 | 4.0 GPM 3500 PSI Triplex Pump Unloader Installed

RKV4G35D-F24C2 by Annovi Reverberi — RK Series Triplex Plunger Pump with Gymatic Unloader | 4.0 GPM | 3,500 PSI | Bronze Connecting Rods | 1″ Hollow Keyway Shaft | SAE J609A Gas and Diesel Engine Drive | No Chemical Injector

The RKV4G35D-F24C2 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 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 RKV4G35D-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, grease, and large commercial surfaces more aggressively than standard 3,000–3,200 PSI platforms — through a reinforced crankcase with bronze connecting rods, solid ceramic plungers, stainless steel valves, and an F24 SAE J609A direct-drive flange for close-coupling to gasoline or diesel engines.

The RKV4G35D-F24C2 is the standard (non-HD) RK Series configuration at 3,500 PSI — correct for operators who need the RK Series industrial pump architecture and Gymatic bypass regulation without the additional HD reinforced crankcase specification of the RKV4G35HD-F24C2. The Gymatic (C2) unloader on the RKV4G35D-F24C2 provides 150 PSI of operating headroom above 3,500 PSI and is compatible with downstream external chemical injectors and detergent systems when soap application is required — no factory-installed downstream injector is included in this no-“I” suffix configuration.

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-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 RKV4G35D-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 RKV4G35D-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 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
• 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 — within AR’s accepted upside variance for this pairing. The C2 unloader body is compatible with downstream external chemical injection systems.
• No trailing I suffix — the model terminates at C2, confirming no factory-installed downstream chemical injector. This pump delivers straight 3,500 PSI water output. For the injector-equipped variant, select the RKV4G35D-F24C2I.
• No HD designation — this is the standard RK Series D configuration without the Heavy Duty reinforced crankcase specification. For the HD variant at this output, select the RKV4G35HD-F24C2.

RKV4G35D-F24C2 — Positioning in the RK Series 3,500 PSI Family

The RKV 4.0 GPM / 3,500 PSI family includes several configurations. The RKV4G35D-F24C2 is the standard D (non-HD) no-injector Gymatic C2 configuration:

• RKV4G35D-F24C2 (this model) — standard crankcase, Gymatic C2 (150 PSI headroom), no injector. Correct for operators needing RK Series Gymatic bypass regulation at 3,500 PSI without the HD construction upgrade.
• RKV4G35HD-F24C2 — HD reinforced crankcase and bronze rods, Gymatic C2 (150 PSI headroom), no injector. Correct for continuous duty cycles demanding HD construction.
• RKV4G35D-F24C2I — standard crankcase, Gymatic C2 (150 PSI headroom), integrated downstream chemical injector. Correct for two-mode wash capability without HD specification.
• RKV4G35HDF24C1 — HD construction, Gymatic VR35 C1 (500 PSI headroom), no injector. Correct for maximum unloader stability and HD construction at this pressure point.

Key Specifications

RKV4G35D-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 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 — standard RK Series construction for continuous commercial duty
• 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, adjustable pressure regulation, rated to 3,650 PSI; 150 PSI operating headroom above 3,500 PSI output; compatible with downstream external chemical injectors
• Chemical Injector: Not included — model terminates at C2 with no “I” suffix; no factory-installed downstream injector
• Warranty: 5-year limited warranty — US-based coverage through AR North America

What’s Included in the Box

A Complete, Factory-Configured RKV4G35D-F24C2 Assembly Ready for Installation

• Factory-installed Gymatic unloader (C2) — pre-mounted and calibrated; no factory-installed downstream injector on this RKV4G35D-F24C2 variant; C2 unloader body compatible with downstream external chemical injection systems
• 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-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 RKV4G35D-F24C2 component
• Factory test certification — every RKV4G35D-F24C2 load-tested at 50%, 100%, and 150% of rated output before leaving the AR manufacturing facility

The Gymatic Unloader — 150 PSI Headroom at 3,500 PSI with External Chemical Compatibility

Straight Water Output. External Chemical Architecture. Set It. Lock It.

The Gymatic (C2) unloader on the RKV4G35D-F24C2 is rated to 3,650 PSI — operating with 150 PSI of headroom above 3,500 PSI within AR’s accepted variance for this pairing:

• 150 PSI operating headroom — the C2 at 3,500 PSI operates within its rated envelope, producing stable, responsive bypass regulation across continuous production wash cycles on the RKV4G35D-F24C2
• Adjustable then tamper-resistant — operating pressure set on-site and locked before production, maintained 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
• No factory-installed downstream injector — the RKV4G35D-F24C2 delivers straight 3,500 PSI water output without an integrated chemical injector. Operators requiring on-board detergent capability should select the RKV4G35D-F24C2I.
• Compatible with downstream external chemical systems — the C2 unloader on the RKV4G35D-F24C2 is designed to work seamlessly with separately installed downstream chemical injectors, soft wash proportioners, and dedicated detergent systems when soap application is required
• Flexible pressure range — C2 unloader adjustment supports everything from lighter rinsing to full 3,500 PSI aggressive washdown, matching system pressure to different nozzles, surfaces, and cleaning tasks
• Engine load reduction in bypass — reduced back-pressure lowers engine load and fuel consumption during trigger-off idle intervals on full-day wash operations

RK Series Construction — Built for 3,500 PSI Commercial Duty

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

• Solid ceramic plungers in the RKV4G35D-F24C2 resist abrasion, heat, and chemical attack at 3,500 PSI across extended commercial operating hours. Individual replacement when service limits are reached — no full pump replacement required.
• Bronze connecting rods provide high load-bearing strength on the RKV4G35D-F24C2, distributing forces evenly across the crankshaft and supporting continuous-duty performance under the sustained mechanical loads of 4.0 GPM / 3,500 PSI operation
• Reinforced crankcase on the RKV4G35D-F24C2 protects internal components from vibration and torsional stress common in mobile and industrial pressure systems, maintaining crankshaft and bearing alignment during continuous commercial operation
• 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 inlet and discharge 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-F24C2

Front-Access Serviceability — RK Series Maintenance Advantage

Valve and Packing Service Without Full Disassembly

• Front-access piston packings — packing replacement on the RKV4G35D-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 RKV4G35D-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 RKV4G35D-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 RKV4G35D-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 RKV4G35D-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 — ideal for trailer rigs, skid assemblies, and OEM pressure washer platforms where space and simplicity are critical
• Included mounting hardware — bolts and fasteners sized for the F24 SAE J609A bolt pattern are supplied in the box with the RKV4G35D-F24C2

Typical Applications

Where the RKV4G35D-F24C2 Delivers Best Results

• Construction equipment cleaning — removing mud, grease, and concrete residue from excavators, loaders, and jobsite machinery where 3,500 PSI and external chemical management handle maximum contamination on the RKV4G35D-F24C2
• Fleet maintenance — trucks, buses, and service vehicles where 4.0 GPM coverage speed and 3,500 PSI cleaning force handle heavy road film with chemical applied through a dedicated external injector
• Agricultural machinery — tractors, implements, and barn facilities on gas or diesel engine-powered rigs where maximum volume at elevated pressure handles large surface areas
• Industrial facility wash bays — warehouses, processing plants, and equipment washdown stations where the RKV4G35D-F24C2’s front-access serviceability reduces maintenance downtime
• Commercial contractor rigs — trailer and skid-mounted systems where the RKV4G35D-F24C2’s compact F24 direct-drive footprint and RK Series architecture support diverse daily field operations
• Soft wash system rinse supply — the RKV4G35D-F24C2 provides clean 3,500 PSI / 4.0 GPM rinse water while a dedicated soft wash proportioner manages chemical delivery independently

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

RK Series Performance Backed by Domestic Support

The RKV4G35D-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 RKV4G35D-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, and proper winterization using RV-grade environmentally safe antifreeze — the RKV4G35D-F24C2 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-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 RKV4G35D-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. RK Series. Gymatic Bypass. External Chemical Compatible.

Italian Engineering. High-Volume Clean Water 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 within its comfortable operating envelope, straight water output fully compatible with external chemical injection systems, RK Series reinforced crankcase with front-access piston packing and valve serviceability, and bronze connecting rods — the RKV4G35D-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. 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.