Galley Maid MR-7 Rotor — Genuine OEM Replacement for MR-7 Series Pump Units
The Galley Maid MR-7 Rotor is the factory-matched brass rotor designed specifically for use in Galley Maid MR-7 series rotary vane pump units. Whether you are restoring an aging pump or addressing pressure loss caused by wear or dry-run damage, this rotor is the precision-fit component that brings the MR-7 back to full working condition. Machined from durable brass, the MR-7 Rotor works in close partnership with the rubber stator to create the pumping action essential to proper system operation. When the rotor surface becomes rough, scored, or corroded, the stator can no longer maintain a proper seal around it, causing the pump to lose pressure or fail to prime altogether.
Replacing the MR-7 Rotor is a well-documented repair that, when performed with the correct OEM component, delivers reliable and lasting results. Technicians familiar with the MR-7 unit appreciate that the brass rotor can often be cleaned and re-used after light wear, but when damage is beyond surface conditioning — such as after an extended dry-run event — a direct replacement rotor is the correct path forward. Pairing a new rotor with a fresh stator and seal kit ensures the rebuilt pump performs as intended and delivers the consistent pressure and flow the MR-7 design is known for.
Key Features
- Genuine OEM replacement rotor engineered specifically for the Galley Maid MR-7 pump
- Constructed from durable brass for corrosion resistance and long service life
- Precision-machined to exacting tolerances for proper fit and sealing within the MR-7 stator
- Compatible with MR-7 rotary vane pump units across all available voltages (12V, 24V, 32V DC)
- Restores pump pressure-building capability when worn, scored, or dry-run damaged
- Works with standard Galley Maid stator, seal kit, and nose housing components for a complete rebuild
- Can be cleaned with a wire brush and lacquer thinner when lightly worn for extended service life
Applications
- Direct replacement rotor for Galley Maid MR-7 series pump units
- Pump rebuilds and overhauls on vessels equipped with Galley Maid MR-7 motor pump units
- Restoration of pressure loss attributed to rotor wear or dry-run damage
- Component replacement in MR-7 units servicing freshwater pressure systems and waste pump assemblies
- Used by marine technicians, pump rebuild shops, and service facilities handling Galley Maid equipment
Specifications
- Part Number: MR-7 Rotor (Rotor for MR-7)
- Material: Brass
- Pump Type Compatibility: Rotary vane positive-displacement pump
- Compatible Pump Model: Galley Maid MR-7
- Voltage Compatibility: 12V DC, 24V DC, 32V DC (all MR-7 motor variants)
- Stator Compatibility: Galley Maid MR-7 Stator
- Seal Compatibility: Galley Maid MR-7 Seal Kit
- Mounting: Centered among 4 bolts within MR-7 nose housing
Frequently Asked Questions
Q: What causes the MR-7 rotor to need replacement?
The most common cause of rotor damage is dry running, which occurs when the pump operates without water or fluid flowing through it. Dry running creates friction and heat between the brass rotor and rubber stator, roughening or scoring the rotor surface. Once the surface is no longer smooth, the stator cannot seal properly against it, and the pump loses the ability to build pressure.
Q: Can the MR-7 rotor be cleaned and reused instead of replaced?
In cases of light surface wear or minor corrosion, the brass rotor can often be cleaned using a wire brush and lacquer thinner and returned to service. However, if the rotor surface is deeply scored, corroded, or structurally compromised from an extended dry-run event, replacement with a new OEM rotor is the correct and lasting solution.
Q: Do I need to replace both the rotor and stator at the same time?
It is strongly recommended to inspect both components together during any service event. If the rotor is being replaced due to wear or damage, the stator should also be replaced, as the two components wear against each other and a new rotor paired with a degraded stator will not restore full pump performance. Including the seal kit in the rebuild is also considered best practice.
Q: What tools and materials are needed to install the MR-7 Rotor?
Installation requires basic hand tools for removing the pump nose housing, which is secured by four bolts tightened to screwdriver tightness. A small amount of silicone grease applied to the interior of the stator and rotor surface is recommended during reassembly to ease installation and reduce initial wear. The stator flange must be centered among the four housing bolts before the nose is reinstalled.
Q: Is the MR-7 Rotor compatible with all voltage versions of the MR-7 pump?
Yes. The MR-7 Rotor is the pump-end component shared across all MR-7 motor configurations, including 12V, 24V, and 32V DC variants. The rotor and stator assembly is consistent regardless of the motor voltage, making this a universal fit for all MR-7 series units.
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