HYDM1425M Hydraulic Motor | 8.7 cid Marzocchi

HYDM1425M Marzocchi LSHT Hydraulic Motor

Product Role & System Position

• Marzocchi external-gear hydraulic motor with approximately 8.7 in³/rev (≈142.5 cc/rev) displacement.
• Configured for high-torque hydraulic drive of mid- to large-frame Annovi Reverberi (AR) triplex plunger pumps.
• Designed for demanding pressure-wash systems where starting torque, smooth rotation, and long-duty stability are required.
• Optimized for direct, coaxial mounting with the pump on a rigid shared base.
• Eliminates belt drives, belt tension drift, and oversized guards common in traditional layouts.

Motor Architecture & Operating Characteristics

• External-gear LSHT motor manufactured by Marzocchi.
• Large displacement provides strong starting torque at low to moderate shaft speeds.
• Supports stable pressure rise and smooth running under heavy load.
• Reduces pressure fluctuation and trigger chatter when paired with properly sized AR pumps.
• Compact round-body form factor simplifies packaging in skids, service bodies, and plant carts.

Mounting & Alignment Strategy

• Intended for coaxial mounting with the pump on a shared rigid base.
• Shared centerline minimizes side loading on pump bearings and seal packs.
• Reduced side loads allow assemblies to run cooler, quieter, and with less vibration than belt-driven systems.
• Close-coupled layout preserves access to coupling hardware, fasteners, oil sight glass, and vented dipstick.
• Leaves perimeter space for short suction runs and tidy pressure and bypass routing.

Hydraulic Ports & Circuit Requirements

• Typical motor porting includes SAE-12 ORB (3/4″) pressure and return connections.
• Many builds include an SAE-8 ORB (1/2″) case drain; always verify on the supplied motor.
• A/B port orientation must be observed so motor rotation matches pump rotation.
• Any case drain must return to the reservoir above oil level and must never be capped or restricted.
• Hose IDs must be generously sized and bend radii respected to prevent restriction and heat buildup.

Quick Sizing & Shop Math

• Motor speed: RPM ≈ 231 × hydraulic GPM ÷ displacement (in³).
• With 8.7 in³ displacement, speed is approximately 26.5 × hydraulic GPM.
• Torque output: lb-in ≈ displacement (in³) × PSI ÷ 6.283.
• At 3000 PSI, estimated torque is approximately 4,155 lb-in (≈ 346 lb-ft).
• Hydraulic power: HP ≈ GPM × PSI ÷ 1714, then apply realistic motor and system efficiencies.
• Prime mover must be capable of supplying the full flow and pressure window required by the pump.

Compatible AR Pump Frames

• Well matched to mid-frame and larger AR triplex pumps requiring high torque at moderate RPM.
• Common AR pump pairings include:
• XWL50.20 — approximately 13 GPM at 3000 PSI.
• RTX60 — approximately 15.8 GPM at up to 4350 PSI.
• RTX70 — approximately 18.5 GPM at 2900 PSI.
• Pump selection must always respect published maximum RPM limits.

AR Pump Manufacturer & Water-Side Integration

• Pump manufacturer: Annovi Reverberi (AR), engineered and built in Modena, Italy.
• AR pumps ship with crankcase oil installed and include a vented dipstick and sight glass.
• Covered by a 5-year limited, conditional warranty.
• Warranty requires proper hydraulic and water-side installation, filtration, lubrication, and operation within published limits.
• Typical porting in this class includes 1″–1¼” F-BSPP inlet and 1/2″ F-BSPP outlet.

Water-Side Plumbing Requirements

• Suction plumbing must be short, straight, and oversized from a flooded supply.
• Anti-collapse suction hose and coarse inlet strainer required to prevent cavitation.
• Adjustable unloader matched to AR duty class required.
• Correctly sized high-pressure relief valve required for system protection.
• Glycerin-filled pressure gauge required for commissioning and diagnostics.
• Thermal relief valve required on bypass loop for extended gun-closed operation.

Integration Checklist

• Match motor displacement and available hydraulic flow to target pump RPM.
• Confirm torque and horsepower against nozzle selection and working pressure.
• Verify upstream relief settings, reservoir volume, filtration, and cooling capacity.
• Include and properly route a case drain if specified by the motor build.
• Lay out suction, pressure, and bypass lines with generous hose IDs and bend radii.
• Never overspeed the pump and never run it dry.

System Advantages

• High torque at low-to-mid speeds delivers stable pressure on large AR pump packages.
• Direct-drive layout eliminates belts, belt dust, retensioning, and bulky guards.
• Rigid, alignment-stable geometry extends bearing and seal life.
• Predictable hose routing supports repeatable OEM builds and faster pump swaps.
• Service-friendly access enables single-technician coupling inspection and routine PM.

Typical Applications

• Mobile wash fleets and service-truck installations.
• Heavy-equipment yards and rental turn-back wash systems.
• Municipal and DOT fleet maintenance facilities.
• Marine, tug-boat, and dock washdown systems.
• Food and beverage sanitation and packaging rooms (observe local hygienic standards).
• Agriculture and ranch equipment wash bays.
• Conveyor systems, parts-cleaning cells, plant carts, and contractor rigs with onboard hydraulic power.