HYDM520M Hydraulic Motor | 3.17 cid Marzocchi

HYDM520M Hydraulic Drive Package with Marzocchi 3.17 in³ LSHT Motor

Product Configuration

• HYDM520M is a compact, high-torque hydraulic drive built around a Marzocchi external-gear (LSHT) hydraulic motor with 3.17 in³/rev (≈52.0 cc/rev) displacement.
• Excellent match for mid-frame Annovi Reverberi (AR) triplex plunger pumps where precise speed control, tight packaging, and repeatable alignment matter.
• Mounted with the pump on a shared rigid base so motor and pump share the same centerline, reducing side loads on bearings and seal packs for cooler, quieter, longer-running assemblies versus belt systems.
• Close-coupled geometry leaves clean space for short, direct suction, tidy pressure and bypass sweeps, and perimeter room for an unloader block without tight bends.
• Technicians retain clear access to the coupling, oil sight glass, vented dipstick, and fasteners for quick single-tech PM.

Hydraulic Motor and Ports

• Motor type and brand: Marzocchi external-gear LSHT motor, 3.17 in³ (≈52 cc) displacement for confident starting torque and smooth running at pressure.
• Compact round-body form factor supports tight skid and service-body installs.
• Typical hydraulic ports include SAE-12 ORB (3/4 in) pressure and return and SAE-8 ORB (1/2 in) case drain when the supplied build requires it; verify the furnished motor.
• Observe A and B port orientation for correct rotation and route any case-drain line above reservoir oil level to prevent aeration.
• Size hose IDs generously and respect bend radii to avoid restriction and excess heat.

HYDM520M Pump Manufacturer and Water Ports

• Pump manufacturer: Annovi Reverberi (AR), leader in quality since 1958, pumps engineered and made in Modena, Italy.
• AR pumps ship with crankcase oil installed and include a vented dipstick and sight glass for quick pre-start checks.
• Typical mid-frame AR ports include RK and RK21xx frames with 1/2 in F-BSPP inlet and 3/8 in F-BSPP outlet; verify the selected pump.
• Typical mid-frame AR ports include XWL and RTX mid-frames with 1 in F-BSPP inlet and 1/2 in F-BSPP outlet; verify the selected pump.
• Adapters to NPT are readily available for common plumbing standards.
• Keep suction short, straight, and oversize from a flooded source using anti-collapse suction hose and a coarse inlet strainer to protect volumetric efficiency and prevent cavitation.

HYDM520M Integration Checklist

• Match motor displacement and available hydraulic flow and pressure to the target pump RPM.
• Set upstream hydraulic reliefs correctly for the intended working pressure.
• Confirm reservoir volume, return filtration, and cooling capacity for the duty cycle.
• Include a case-drain line if the motor specification calls for it.
• Select an adjustable unloader and high-pressure relief appropriate to your AR duty class.
• Add a glycerin-filled gauge for commissioning and diagnostics.
• Include a thermal relief on the bypass loop for extended gun-closed operation.

Helpful Shop Formulas

• Pump speed: rpm ≈ 231 × hydraulic gpm ÷ displacement (in³), and with 3.17 in³ displacement, rpm ≈ 72.9 × gpm.
• Torque: lb-in ≈ displacement (in³) × psi ÷ 6.283, and at 3000 psi, torque ≈ 1,515 lb-in (≈126 lb-ft).
• Hydraulic horsepower: hp ≈ gpm × psi ÷ 1714, and apply efficiency to confirm real shaft power at the pump.

Why Direct Hydraulic Drive HYDM520M

• Smooth LSHT torque for stable pressure and calm trigger cycling.
• No belts to tension, no belt dust, and less guard bulk.
• Alignment-stable geometry helps extend seal and bearing life.
• Compact footprint with predictable hose routing supports repeatable OEM builds and fast pump swaps.

HYDM520M Typical Applications

• Mobile wash skids and service-truck bodies.
• Heavy-equipment yards and rental turn-backs.
• Municipal and DOT fleet maintenance and wastewater operations.
• Conveyor and parts-cleaning cells and plant carts.
• Food and beverage sanitation and packaging rooms while observing local hygienic standards.
• Marine tug-boat and dock washdown.
• Agriculture and ranch equipment wash.
• Contractor rigs and utility platforms that already carry hydraulic power.

Ownership and Warranty

• When paired with HYDM520M, the pump is manufactured by Annovi Reverberi.
• Pump is backed by a 5-year limited, conditional warranty.
• Coverage requires proper hydraulic and water-side installation, correct filtration and lubrication, and operation within published limits.
• Normal wear items such as seals and valves are considered consumables.

HYDM520M At-a-Glance Specs

• Hydraulic motor: Marzocchi external-gear LSHT, 3.17 in³ (≈52 cc) displacement.
• Hydraulic ports: typically SAE-12 pressure and return and SAE-8 case drain if required.
• Pump ports (typical mid-frame AR): 1/2 in F-BSPP inlet and 3/8 in F-BSPP outlet, or 1 in F-BSPP inlet and 1/2 in F-BSPP outlet; verify on your selected AR model.
• Ships with: AR factory oil fill, sight glass, and vented dipstick.
• Benefits: compact, belt-free, alignment-stable, service-friendly, and built for predictable long-term performance in professional hydraulic wash systems.