HYD-RTDSS80.300HN-DD Hydraulic Pump | SS Head 21 GPM 4350 PSI

HYD-RTDSS80.300HN-DD | Stainless Steel Hydraulic Motor Pump | 21 GPM 4350 PSI | 1000 RPM

HYD-RTDSS80.300HN-DD is the stainless-steel-head configuration of Annovi Reverberi’s RTD 80.300 industrial platform — a large-frame 418-series triplex plunger pump delivering 21 GPM (80 L/min) at up to 4350 PSI (300 bar) on a slow-turning 1000 RPM frame, built for direct hydraulic drive via a hollow 14-tooth splined shaft. The SS designation marks the top of the head-material ladder: where other versions of this platform run brass or nickel-plated heads, this pump’s wetted head is solid stainless steel — corrosion resistance through the full material section, not a surface treatment.

That distinction defines its buyers: operations pumping water that attacks everything else. Marine and offshore washdown in constant salt exposure. Utility potholing and hydro-excavation through winter road brine, where calcium and magnesium chloride slurry destroys brass heads in a season. Food and beverage sanitation where wetted materials are specified. Desalination, reverse osmosis, and treated-water systems running chloride-heavy or low-pH chemistry. If the water itself is the enemy, the HYD-RTDSS80.300HN-DD is the RTD built to fight it.

HYD-RTDSS80.300HN-DD Specifications

• SKU: HYD-RTDSS80.300HN-DD
• Configuration: Direct-drive hydraulic pump — hollow 14T splined shaft mounts directly onto an SAE C hydraulic motor
• Pump: Annovi Reverberi RTD 80.300 platform (418-series industrial frame), stainless steel head
• Flow Rate: 21 GPM (80 L/min)
• Maximum Discharge Pressure: 4350 PSI (300 bar)
• Rated Speed: 1000 RPM — never overspeed
• Power Requirement: Approximately 55–60 HP at full duty
• Drive Interface: Hollow female 14-tooth splined shaft with F57-class close-couple flange (SAE J744 C127)
• Inlet Port: 1-1/2″ F
• Outlet Port: 1″ F
• Head Material: Stainless steel with stainless wet-end components
• Plungers: Ceramic; bronze connecting rods on the industrial 418 frame
• Weight: Approximately 143 lbs (65 kg)

Why Solid Stainless Over Plating

Nickel plating is an excellent barrier — until high-velocity erosion, cavitation microjets, or mechanical wear open a pinhole at a valve seat, and corrosion undercuts the plating from beneath. A solid stainless head has no barrier to breach: the corrosion resistance runs through the entire section, at every seat, port, and sealing surface, for the life of the component. In chloride-saturated service — seawater, road brine, softened or treated water with aggressive chemistry — that difference determines whether the head is a lifetime component or a wear item. On a pump carrying this duty point, specifying the HYD-RTDSS80.300HN-DD once beats replacing lesser heads on a schedule.

Hydraulic Supply Requirements

This is dedicated-power territory: driving 21 GPM at 4350 PSI takes roughly 70 hydraulic horsepower delivered continuously at the motor. As reference, AR’s published pairings for the adjacent RTD 100.210 model run a piston 84cc motor at 314 bar and 93 L/min (24.6 GPM), or a 108cc motor at 243 bar and 120 L/min (31.7 GPM). Supply of that magnitude comes from a hydrovac truck’s dedicated hydraulic system or a purpose-built power unit — not an auxiliary circuit. Select the SAE C motor displacement to reach 1000 RPM at your available flow — RPM ≈ 231 × hydraulic GPM ÷ displacement (in³) — verify torque at working pressure, protect the motor with a correctly set relief, and engineer reservoir capacity, return filtration, and oil cooling for continuous duty. Call WSHPWR with your system’s flow, pressure, and cooling details and we will spec the motor and confirm the match before you commit.

Direct-Drive Advantages

The HYD-RTDSS80.300HN-DD’s hollow 14T splined shaft slides directly onto a male-splined SAE C hydraulic motor — no coupler, no belt, no alignment procedure. Motor and pump share one centerline inside the rigid flange interface, protecting bearings and seal packs from side loading while keeping the installed footprint tight for trucks, skids, and plant installations. The 1000 RPM rated speed compounds the stainless head’s longevity: fewer plunger cycles per gallon pumped means every seal and valve sees fewer strokes per shift, extending rebuild intervals on equipment that runs all day.

Industrial 418-Series Construction

Beneath the stainless head, the 418 frame is AR’s heavy industrial architecture: ceramic plungers, bronze connecting rods, and a crankcase and drive geometry sized for continuous duty at power levels the compact frames never see. Valve access is serviceable in place, so inspection and replacement happen without dismounting the HYD-RTDSS80.300HN-DD from the truck or skid.

Installation & Operation Notes

Confirm your hydraulic motor’s spline count and mount before ordering — this pump takes a 14T SAE C motor; 13T SAE B motors from RTX-class systems will not interchange. Mount horizontally, verify motor rotation at commissioning, and treat the suction side as mission-critical: at 21 GPM, restricted inlet plumbing causes cavitation no pump survives long — plumb the 1-1/2″ inlet full-size from a flooded supply, and remember that cavitation damage does not respect head material. Pair the discharge with an unloader and safety relief rated for the working pressure, size nozzles to the 21 GPM duty point, rinse the system after brine or chemical sessions as good practice even with stainless, and never operate above 1000 RPM.

Quality Assurance & Maintenance

Every HYD-RTDSS80.300HN-DD is factory-tested for flow rate, pressure stability, and vibration before shipment. Maintenance follows the industrial RTD pattern — scheduled crankcase oil changes, seal inspection, and valve checks with AR’s 418-platform repair kits — with the stainless head removing corrosion from the wear equation entirely. Standard and nickel-plated versions of this same platform are available where the water chemistry is milder: see HYD-RTD80.300HN-DD, and the hot-water HYD-RTD-HW80.300HN-DD for boiler-fed duty.

HYD-RTDSS80.300HN-DD Key Features & Applications

• 21 GPM at 4350 PSI on a 1000 RPM industrial frame — with a solid stainless steel head.
• Corrosion resistance through the full material section — no plating to breach, no barrier to undercut.
• Hollow 14T splined shaft direct-drives from an SAE C hydraulic motor — no coupler or alignment.
• Slow 1000 RPM rated speed extends seal and valve intervals under continuous duty.
• Ceramic plungers and bronze connecting rods on AR’s heavy 418-series industrial frame.
• Requires approximately 70 hydraulic HP — dedicated truck hydraulics or a purpose-built power unit.
• Ideal for marine and offshore washdown, road-brine hydro-excavation, food and beverage sanitation, desalination and treated-water systems, and chemical-plant cleaning.