HYDM870M Hydraulic Motor | 5.3 cid Marzocchi

HYDM870M Hydraulic Drive Package with Marzocchi 5.3 in³ LSHT Motor

Product Configuration

• HYDM870M is a compact, high-torque hydraulic drive built around a Marzocchi external-gear motor with 5.3 in³/rev (≈86.9 cc/rev) displacement.
• Ideal for mid- to larger-frame Annovi Reverberi (AR) triplex plunger pumps where reliable speed control, tight packaging, and predictable alignment matter.
• Mounted with the pump on a shared, rigid base so both shafts stay on the same centerline, minimizing side loads on bearings and seal packs for cooler, quieter, longer life versus belt systems that drift with heat and tension.
• Close-coupled layout preserves service access around the coupling, oil sight glass, and vented dipstick, while leaving perimeter room for short, direct suction and tidy pressure and bypass sweeps for repeatable OEM builds in skids, service bodies, vans, and plant carts.

Hydraulic Motor and Ports

• Motor type and brand: Marzocchi external-gear LSHT motor, 5.3 in³ (≈86.9 cc) displacement for strong starting torque and smooth, steady running at pressure.
• Typical hydraulic ports include SAE-12 ORB (3/4″) pressure and return and SAE-8 ORB (1/2″) case drain when the supplied build requires it.
• Observe A and B orientation for correct rotation and route the case-drain line above reservoir oil level to prevent aeration.
• Size hose IDs generously and respect bend radii to avoid restriction and unnecessary heat.

Pump Manufacturer and Water Ports

• Pump manufacturer (water end): Annovi Reverberi (AR), industry leader in quality since 1958, with pumps engineered and made in Modena, Italy.
• Every AR pump ships with crankcase oil installed and includes a vented dipstick and sight glass for quick pre-start checks.
• Typical mid and large AR manifold sizes include 1″–1 1/4″ F-BSPP inlet and 1/2″ F-BSPP outlet with adapters to NPT readily available.
• Verify exact porting on the chosen AR model, including XWL50.20 ≈13 GPM at 3000 PSI, RTX60 ≈15.8 GPM at 4350 PSI, and RTX70 ≈18.5 GPM at 2900 PSI.

Direct-Drive Advantages

• No belts or retensioning, no belt dust, and less guard bulk.
• Rigid, alignment-stable geometry reduces vibration and extends seal and bearing life.
• Compact footprint with predictable hose routing supports fleet standardization and fast pump swaps.

Integration Notes

• 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, filtration, and cooling for the duty cycle.
• Include a case drain if the motor specification calls for it, which is common on larger frames.
• Keep suction lines short, straight, and oversize from a flooded feed.
• Add a coarse inlet strainer and anti-collapse suction hose to protect volumetric efficiency and prevent cavitation.
• Install an adjustable unloader and a correctly sized high-pressure relief matched to your duty class.
• Add a glycerin-filled gauge for commissioning and diagnostics and a thermal relief on the bypass loop for extended gun-closed operation.

Helpful Shop Formulas

• Pump speed: rpm ≈ 231 × hydraulic gpm ÷ displacement (in³).
• Torque: lb-in ≈ displacement (in³) × psi ÷ 6.283.
• Hydraulic horsepower: hp ≈ gpm × psi ÷ 1714, then apply efficiency for real shaft power at the pump.

Hydraulic Cleanliness and Cooling

• Specify 10–25 micron return filtration with an adequate β-rating.
• Size the reservoir for heat rejection using a practical rule of 2–3× total system flow.
• Add an oil cooler for hot climates, prolonged bypass, or continuous duty.
• Verify hose IDs and bend radii on suction, pressure, and bypass runs to avoid restriction and excessive heat.

Industrial Applications

• Tug and work boats and marine docks.
• Farming and ranch equipment wash.
• Food and beverage plants and sanitation lines while observing local hygienic standards.
• Work and service trucks.
• Conveyor and parts-cleaning cells and plant carts.
• Municipal and DOT fleets and heavy-equipment yards.
• Rental turn-back stations and contractor rigs.
• General plant maintenance where hydraulic power is already available.

Ownership and Warranty

• When paired with an AR pump, the water end is covered by a 5-year limited, conditional warranty.
• Coverage requires proper hydraulic and water installation, correct filtration and lubrication, and operation within published limits.
• Seals and valves are considered normal consumables.

Why Specify HYDM870M

• High-torque Marzocchi motor supporting calm trigger cycling and stable pressure.
• Compact, alignment-friendly package that fits tight spaces and reduces guard requirements.
• Cleaner than belt systems with fewer parts to adjust or replace.
• Single-technician service access with clear sightlines to coupling, oil sight, and dipstick.
• Predictable geometry supports repeatable OEM builds across fleets.

Quick Checklist Before Startup

• Confirm motor displacement and available hydraulic flow will hit the target pump rpm using the formulas above.
• Verify hydraulic relief settings and prime-mover capacity against required shaft power.
• Route any case-drain line above reservoir oil level.
• Confirm reservoir size and cooling capacity for the duty cycle.
• Keep suction plumbing short, direct, and oversize from a flooded source.
• Select nozzle orifices to hold the desired flow and pressure and never overspeed the pump.