HYD-RTJ70 Hydraulic Motor Pump | 18.5 GPM 4000 PSI

HYD-RTJ70 | Hydraulic Motor Pump | 18.5 GPM 4000 PSI | Gearbox Drive

HYD-RTJ70 pairs one of the industry’s most valuable duty points with its most flexible drive: 18.5 GPM (70 L/min) at up to 4000 PSI from AR’s RT-class platform, in the J-version gearbox build — the configuration in AR North America’s suffix system that puts an integral reduction gearbox on the pump so higher-speed power can drive it correctly. The pump turns at its rated speed; the gearbox absorbs the difference; and the drive question opens up to the compact, fast-turning power sources that direct-drive builds exclude.

The duty point needs no introduction in the trades it serves. Eighteen-and-a-half gallons at four thousand PSI is the midsize jetting specification — the combination that propels nozzles up long sewer runs, cuts roots and grease blockages, and flushes the line clean behind itself — and the same numbers do production work on heavy equipment, fleet degreasing, and surface prep where both flow and pressure earn their keep. The RTJ70 delivers it with a drivetrain twist that fleet builders in exactly those trades keep asking for.

HYD-RTJ70 Specifications

• SKU: HYD-RTJ70
• Configuration: Gearbox-drive pump — J version, integral reduction gearbox; input interface confirmed at order
• Pump: Annovi Reverberi RT-class 70 platform
• Flow Rate: 18.5 GPM (70 L/min)
• Maximum Discharge Pressure: 4000 PSI (275 bar class)
• Pump Speed: Rated speed held by the integral gearbox — never overspeed the pump end
• Power Requirement: Approximately 51 HP at full duty
• Maximum Fluid Temperature: 140°F
• Pump Head: Corrosion-resistant with stainless wet-end components
• Plungers: Ceramic

The Gearbox Argument

Every pump has one correct speed and every power source has its own, and the distance between them is the whole discipline of drive engineering. Direct-drive builds close that distance with displacement — big, slow hydraulic motors matched one-to-one — which works beautifully and costs accordingly: large-displacement motors are the expensive, longer-lead corner of the motor world. The J-version gearbox closes it with gearing instead: a compact, high-speed power source runs at the speed it likes while the reduction delivers the pump’s rated RPM at multiplied torque. For hydraulic systems, that opens the drive to smaller, faster, cheaper motors; for engine-driven builds, it lets the pump hang on power sources that would destroy a direct-coupled unit. One pump, correct speed, either world.

HYD-RTJ70 Sizing the Drive

Full duty asks roughly 62 hydraulic horsepower delivered continuously (or the equivalent engine power with margin), arriving at the gearbox input at whatever speed your source runs — the reduction handles the translation, and torque at the pump multiplies by the same ratio the speed divides. Verify the input interface against your motor or engine at order, relieve hydraulic circuits within the motor’s rating, filter returns at 10–25 microns, and engineer cooling for shift-length duty: jetting is trigger-on by the hour. Call WSHPWR with your power source’s speed, torque, and interface, and we will confirm the complete drive — gearbox input to nozzle — before you order.

Built for the Jetting Trade

Municipal flushers, contractor jet trucks, and trailer jetters live at exactly this pump’s numbers, and the platform underneath is built for their duty cycle: sustained runs at working pressure, pulsation into long hose reels, water quality that ranges from city-clean to recycled, and duty clocks measured in seasons. The RT-class frame carries it with the serviceable wet end the trade demands — valve access for inspection between jobs, AR repair kits on the standard path, and the ceramic-plunger, stainless-valve construction that treats hard water as a fact rather than a failure mode.

Installation & Operation Notes for HYD-RTJ70

Mount on structure worthy of the assembly, verify rotation and gearbox oil level at commissioning, and confirm the input coupling to specification. Give suction the engineering 18.5 GPM demands — flooded, filtered, full-size plumbing; buffer-tank feed is standard jetting practice. Fit an unloader and relief rated for the working pressure, size jetting nozzles to the duty point, maintain the gearbox on its service schedule alongside the pump’s, and winterize both ends of the machine — gearbox housings and pump heads hold water and oil respectively, and both mind the freeze.

Quality Assurance & Maintenance

Every HYD-RTJ70 is factory-tested for flow rate, pressure stability, and vibration before shipment. Maintenance runs two short schedules in parallel: the pump’s standard AR routine — crankcase oil, seal inspection, valve checks with AR repair kits — and the gearbox’s periodic oil service. Both are bench-simple, and together they keep the drive-flexibility premium paying for itself season after season.

HYD-RTJ70 Key Features & Applications

• 18.5 GPM at 4000 PSI — the midsize jetting specification, on AR’s RT-class platform.
• J-version integral reduction gearbox: high-speed power in, rated pump speed out.
• Opens the drive to compact high-speed hydraulic motors and engine sources direct-drive builds exclude.
• Roughly 62 hydraulic HP (or engine equivalent) runs full duty; interface confirmed at order.
• Jetting-trade wet end: serviceable valves, ceramic plungers, AR repair kits on the standard path.
• Ideal for sewer and storm jetting trucks, trailer jetters, municipal flushers, heavy-equipment washdown, and builds whose power source refuses to turn slow.