HYDM116M Hydraulic Motor | 0.71 cid Marzocchi

HYDM116M Marzocchi LSHT Hydraulic Motor

Product Role & System Position

• External-gear, low-speed/high-torque (LSHT) hydraulic motor engineered for direct-drive pressure washer systems.
• Rated at 0.71 in³ per revolution (approximately 11.6 cc/rev).
• Designed for small- to mid-frame Annovi Reverberi (AR) triplex plunger pumps requiring precise speed control.
• Optimized for compact packaging on mobile wash skids, service bodies, enclosed vans, and plant carts.
• Supports rigid, coaxial mounting to eliminate belt drives and alignment drift.

Motor Design & Operating Characteristics

• Manufactured by Marzocchi HYDM116M using an external-gear LSHT architecture.
• Round-body form factor fits tight installation envelopes without obstructing service access.
• Displacement selected to deliver confident starting torque and stable running at AR operating pressures.
• Smooth torque output supports calm trigger cycling and steady pressure at the nozzle.
• Available in bi-rotational configurations; rotation must match the selected AR pump.
• HYDM116M Hydraulic Motor | 0.71 cid Marzocchi

Mounting & Alignment Architecture

• Intended for mounting on a shared rigid base with the pump on the same centerline.
• Coaxial alignment minimizes side loading on pump bearings and seal packs.
• Reduced side loading lowers vibration and promotes cooler, quieter operation.
• Close-coupled layout preserves space for short suction plumbing and clean pressure/bypass routing.
• Clear access maintained to coupling hardware, oil sight glass, and vented dipstick.
• HYDM116M layout supports single-technician inspection and routine preventive maintenance.

HYDM116M Hydraulic Ports & Hose Routing

• Most builds in this displacement class use SAE-12 ORB (3/4″) ports for pressure and return.
• Many external-gear motors include an SAE-8 ORB (1/2″) case drain; always confirm on the supplied motor.
• Any case drain must return to the reservoir above oil level and must never be capped or restricted.
• A/B port orientation must be observed to ensure correct motor and pump rotation.
• Hose inside diameters should be generously sized with minimum bend radii respected.

Pump Manufacturer & Warranty

• Designed for use with Annovi Reverberi (AR) triplex plunger pumps.
• AR pumps are engineered and built in Modena, Italy and have been the category leader since 1958.
• Pumps ship with crankcase oil installed, a vented dipstick, and an easy-view sight glass.
• Covered by a 5-year limited, conditional warranty.
• Warranty requires proper hydraulic and water-side installation, correct filtration and lubrication, and operation within published limits.
• Seals and valves are treated as normal consumable wear items.

Typical Pump Inlet & Outlet Sizes

• Common AR pump pairings for this motor include:
• Small-frame RK / RK21xx manifolds with 1/2″ F-BSPP inlet and 3/8″ F-BSPP outlet.
• Mid-frame XWL / RTX manifolds with 1″ F-BSPP inlet and 1/2″ F-BSPP outlet.
• Adapters to NPT are readily available; exact porting must be verified on the selected AR model.
• Suction plumbing should remain short, straight, and oversized from a flooded source.
• Anti-collapse suction hose and coarse inlet strainer recommended to protect volumetric efficiency.

Integration Checklist & Sizing

• Motor displacementHYDM116M  and available hydraulic flow must be matched to target pump speed.
• Speed reference: RPM ≈ 231 × hydraulic GPM ÷ displacement (in³).
• With 0.71 in³ displacement, speed is approximately 325 × hydraulic GPM.
• Torque reference: lb-in ≈ displacement (in³) × PSI ÷ 6.283.
• Approximate torque output is ~226 lb-in at 2,000 PSI and ~339 lb-in at 3,000 PSI before efficiency losses.
• Power planning reference: hydraulic HP ≈ GPM × PSI ÷ 1714.
• Upstream relief valves must be set correctly for the intended duty pressure.
• Return-line filtration specified at 10–25 micron with an appropriate beta rating.
• Reservoir volume sized using a practical rule of 2–3× total system flow.
• Oil cooling recommended for hot environments, prolonged bypass operation, or continuous-duty cycles.

Operating Guidance

• AR pump selection and nozzle sizing must be based on the required cleaning result.
• Hydraulic window should be back-solved so the pump reaches rated RPM under load with margin.
• Typical pairings fall in the 3–5.5 GPM and 1000–2900 PSI pump range when supply allows.
• Never overspeed the pump and always adhere to published maximum RPM limits.
• Adjustable unloader, correctly sized high-pressure relief, glycerin-filled gauge, and thermal relief valve are required.

HYDM116M Applications & System Benefits

• Hydraulic-powered wash systems on service trucks and mobile skids.
• Municipal and DOT fleet wash and maintenance platforms.
• Rental-yard turn-back rinse stations and contractor rigs.
• Food and beverage sanitation zones and plant maintenance carts (observe local hygienic standards).
• Agriculture, ranch, marine, tug-boat dock washdown, and equipment-yard rinse stations.
• Delivers a compact, belt-free, alignment-stable drive solution that installs cleanly, runs smoothly, and supports single-technician service.