HYD5530-2 Hydraulic Motor Pump Kit | Triplex

HYD5530-2 | Hydraulic Motor Pump Drive Unit | 5.5 GPM 3000 PSI | Twin Sight Glass

HYD5530-2 is the tight-quarters specialist of the RK-class drive units: the same Annovi Reverberi 5.5 GPM, 3000 PSI, 1450 RPM performance as the standard HYD5530 — built with two crankcase oil sight glasses, one on each side of the pump. That one design change solves the most common serviceability problem in confined installations: when a pump is mounted in a ship hull compartment, an excavation truck tool box, a service body cabinet, or any space where only one side stays accessible, the single sight glass has a fifty-percent chance of ending up facing the wall. On the HYD5530-2, whichever way the installation faces the pump, the oil level is one glance away.

That matters more than it sounds. Crankcase oil is the daily check that keeps a triplex pump alive — and checks that require a mirror, a flashlight, and a contortion act are checks that stop happening. Marine installations and truck upfits are exactly where pumps run hardest and get inspected least; the twin sight glass turns oil monitoring back into a ten-second habit in the installations most likely to skip it.

HYD5530-2 Specifications

• SKU: HYD5530-2
• Configuration: Hydraulic drive unit — RK-class pump with close-coupled hydraulic motor (F38 interface)
• Pump: Annovi Reverberi RK 21.20-class high-pressure triplex plunger pump (228-series frame), twin sight glass crankcase
• Oil Monitoring: Two sight glasses — one on each side of the crankcase
• Flow Rate: 5.5 GPM (21 L/min)
• Maximum Discharge Pressure: 3000 PSI (206 bar class)
• Rated Speed: 1450 RPM — never overspeed
• Pump Power Requirement: Approximately 10.5 HP at full duty
• Inlet Ports (2): 1/2″ F
• Discharge Ports (2): 3/8″ F
• Maximum Fluid Temperature: 140°F
• Pump Head: Brass, with one-piece ceramic plungers
• Drive Interface: F38 close-couple flange (SAE A 82.55)

Why Two Sight Glasses Change the Installation

Confined installs force a sequence: the space dictates the mounting orientation, the orientation dictates which side of the pump you will ever see again, and on a single-glass pump that side is decided by luck. Installers work around it — inspection mirrors zip-tied in cabinets, phone cameras on selfie sticks, or the quiet decision to check the oil “next time.” The HYD5530-2 deletes the problem at the casting: port and starboard, curb side and street side, door side and wall side — both faces of the crankcase carry a glass. For marine engine rooms, hydrovac and excavation truck tool boxes, slide-in skids, and enclosed cabinets, that is the difference between maintenance that happens and maintenance that is intended. The dual ports also pay off at commissioning: whichever side faces the installer during the build, the fill level is verifiable without repositioning a half-mounted pump.

Hydraulic Supply Requirements

Full 5.5 GPM at 3000 PSI performance calls for roughly 13 hydraulic horsepower — on the order of 8.2 GPM (31 L/min) of oil at approximately 2,870 PSI working pressure, consistent with AR’s published gear-motor pairing for the adjacent RK 21.21 model. Standard skid steer auxiliaries and truck systems carry the flow easily; verify working pressure and relief margin, since circuits relieving near 3,000 PSI leave little headroom above the motor’s demand. Route return oil short and filtered to tank, and provide oil cooling for continuous trigger-on duty — enclosed installations especially, where ambient heat has nowhere to go. Call WSHPWR with your machine’s auxiliary flow, pressure, and relief setting and we will confirm the match.

Built for the Spaces That Hide Pumps

Everything else about the HYD5530-2 serves the same confined-install logic as the sight glasses. The F38 close-couple drive puts motor and pump on one centerline with no belts, guards, or alignment to service in a space where service is hard — and motor or pump dismounts independently at the flange, so a repair extracts one component instead of the whole assembly. The 228-series frame keeps the footprint compact, valve access runs through the head via service plugs reachable from the front, and output holds steady regardless of host engine speed.

RK-Series Construction

Beneath the twin-glass crankcase runs the standard RK architecture: corrosion-resistant brass head with stainless wet-end components, one-piece ceramic plungers for heat dissipation and abrasion resistance, and die-cast aluminum construction. AR repair kits interchange with the rest of the RK fleet — the twin sight glass adds visibility, not a new parts shelf.

Installation & Operation Notes

Mount horizontally and confirm motor rotation at commissioning — then confirm at least one sight glass is readable from your service access point, the check this pump makes easy. Feed the inlet from a flooded, filtered supply with short, unrestricted plumbing. Fit an unloader set against working pressure, verify the hydraulic relief against the motor’s rating, size nozzle orifices to the 5.5 GPM duty point, ventilate enclosed compartments for cooling, hold 1450 RPM as the ceiling, and winterize before cold-weather storage — enclosed marine and truck installs freeze later but harder.

Quality Assurance & Maintenance

Every HYD5530-2 ships factory-tested for flow rate, pressure stability, and vibration. Maintenance follows AR’s standard RK schedule — crankcase oil changes, seal inspection, periodic valve checks with AR repair kits — and the twin sight glasses exist precisely so the first item on that list gets checked in the installations where it usually doesn’t. Open-access installations that don’t need the second glass can spec the standard HYD5530 on the identical platform.

HYD5530-2 Key Features & Applications

• Twin crankcase sight glasses — oil level visible from either side, whichever way the install faces the pump.
• 5.5 GPM at 3000 PSI, 1450 RPM — full RK-class flow and pressure, unchanged from the standard unit.
• Purpose-suited to ship hulls, excavation and hydrovac truck tool boxes, service body cabinets, and enclosed skids.
• Runs on ~8.2 GPM of oil (~13 hydraulic HP) — standard auxiliary circuits qualify.
• F38 close-couple direct drive with independent motor/pump service — one component out, not the whole assembly.
• Standard AR RK repair kits; the second glass adds visibility, not parts complexity.