HYDM650339/R Marzocchi Motor Repair Kit | 2.01 cid

Overview

• HYDM650339/R is a dedicated repair kit for
  Marzocchi external-gear (LSHT) hydraulic motors with
  2.01 in³/rev (≈32.9 cc/rev) displacement.
• Intended to correct external leakage, seal weep, creeping case-pressure, and
  the performance fade caused by worn soft parts and mating wear elements.
• Consolidates the high-impact components technicians replace most often so
  motors can be restored to reliable service quickly and predictably.
• Ideal for fleet shops maintaining hydraulic-motor–driven
  Annovi Reverberi (AR) pump packages on skids, service
  bodies, plant carts, and contractor rigs.

Kit Contents (Typical)

• Model-matched to 2.01-cid Marzocchi motors; contents may vary by motor
  revision.
• Includes a front shaft seal, body seals and O-rings, a full
  gasket set, and specified
  wear plates/bushings for the 2.01 in³ family.
• Some variants include thrust elements—always confirm the packing list
  against the motor code on the nameplate before teardown.

Motor Compatibility & Ports

• Fits Marzocchi external-gear LSHT motors in the
  2.01 in³/rev (≈32.9 cc/rev) displacement family.
• Typical hydraulic interface:
  SAE-12 ORB (3/4″) pressure and return and, when
  required, an SAE-8 ORB (1/2″) case drain.
• Observe A/B port orientation for correct rotation and route the case drain
  above reservoir oil level to prevent aeration.
• After reseal, verify hose IDs are generous and bend radii are respected on
  all lines to avoid restriction and heat.

AR Pump Interface & Warranty

• Systems typically pair these motors with
  Annovi Reverberi (AR) triplex pumps—AR is always the pump
  manufacturer.
• Mid-frame RK/RK21xx heads commonly use
  1/2″ F-BSPP inlet / 3/8″ F-BSPP outlet.
• XWL/RTX mid-frames are typically
  1″ F-BSPP inlet / 1/2″ F-BSPP outlet, easily
  adapted to NPT (verify your exact model in current AR documentation).
• AR pumps ship with factory oil in the crankcase and include a vented
  dipstick and sight glass for fast pre-start checks.
• Water end is covered by AR’s
  5-year limited, conditional warranty; proper hydraulic and
  water-side installation, correct filtration and lubrication, and operation
  within published limits are required (seals and valves are consumables).

Best-Practice Service Workflow

• Clean the motor exterior, mark rotation, and drain the case.
• Disassemble carefully; inspect shaft journal and housing for scoring or
  abnormal wear.
• Replace the shaft seal, body seals, O-rings, and wear plates/bushings
  supplied in the kit; lightly lubricate new seals with clean oil.
• Reassemble to the torque values in the service data; verify free rotation by
  hand.
• Reinstall the motor, plumb lines, and pressure test. Confirm case-drain flow
  (if required) and that case pressure stays within specification.
• After a short run-in, recheck for leaks and verify fastener torque.

System Health Checklist

• Set upstream system reliefs correctly for your duty class.
• Specify 10–25 μm return filtration with an adequate
  β-rating and keep the reservoir clean.
• Size the reservoir for heat rejection—practical rule is
  2–3× total system flow—and add oil cooling for hot
  climates, prolonged bypass, or continuous duty.
• On the water side, keep suction short, straight, and oversize from a flooded
  feed; use anti-collapse suction hose and a coarse inlet strainer to prevent
  cavitation that accelerates motor wear.
• Select nozzle orifices to hold your working point without overspeeding the
  pump.

Why Choose HYDM650339/R

• Consolidates the parts that actually fix field complaints—leaks, rising
  noise, and slipping volumetric efficiency—without overbuying components.
• Supports standardized rebuild workflows across fleets and reduces downtime.
• Helps extend bearing and seal life across the hydraulic-motor/AR-pump system
  by restoring correct clearances and sealing.

Typical Applications

• Municipal/DOT and sanitation fleets.
• Rental turn-backs and heavy-equipment yards.
• Food & beverage plant carts and sanitation systems
  (observe local hygienic standards).
• Marine/tug-boat dock washdown rigs.
• Agriculture and ranch equipment wash bays.
• Conveyor and parts-cleaning cells.
• Compact contractor packages where a 2.01-cid Marzocchi motor drives an AR
  triplex pump.

Notes & Limitations

• Repair kit only—motor not included.
• Bearings and some thrust components can be application-specific; inspect and
  replace as required.
• After reseal, verify that SAE-12 P/T and SAE-8 case-drain lines are clean,
  correctly oriented, and free of restrictions.
• Document motor code, kit number, and service date for maintenance records.
• With HYDM650339/R on the shelf, shops can reseal 2.01-cid Marzocchi motors
  confidently and keep AR pump packages running smoothly—backed by Italian-built
  pump quality, factory oil fill, a vented dipstick, and a documented 5-year
  conditional warranty on the water end.