Galley Maid MR-7 Stator — Genuine Rubber Replacement for MR-7 Rotary Vane Pumps
The Galley Maid MR-7 Stator is the factory-matched rubber component that sits at the heart of the MR-7 pump's fluid transfer system. In a rotary vane pump, the stator is the stationary cylindrical housing that surrounds the brass rotor. As the rotor spins, it drives fluid through variable-volume chambers formed between the rotor, the vanes, and the inner wall of the stator. Over time and especially after episodes of dry running, this rubber stator can become internally roughened, cracked, or lose its snug fit over the brass rotor — causing the pump to lose pressure or fail to prime entirely. Replacing the MR-7 stator restores that tight rotor-to-stator seal and brings the pump back to full performance.
Installation is straightforward for anyone comfortable with basic mechanical work. The stator is centered among the four flange bolts within the nose housing, the bolts are tightened uniformly to firm hand-tight, and the pump is reassembled. It is widely recommended to inspect and lightly lubricate the stator's interior and the rotor surface with silicone grease during reassembly, and to always verify that no debris from the worn stator remains inside the pump cavity before installing the new part. Keeping a spare MR-7 stator on hand is a common practice among owners of systems that depend on continuous, reliable pump operation.
Key Features
- Factory-matched rubber stator designed specifically for the Galley Maid MR-7 rotary vane pump
- Snug-fit design over the brass MR-7 rotor to maintain positive displacement pumping action
- Centered flange mount secured by four bolts within the MR-7 nose housing
- Compatible with silicone grease lubrication for ease of installation and extended service life
- Genuine OEM replacement part — not an aftermarket substitute
- Restores pump pressure and priming performance lost from stator wear or dry-run damage
Applications
- Direct replacement stator for Galley Maid MR-7 rotary vane pumps
- Pump rebuild and preventive maintenance service
- Repair of MR-7 pumps experiencing pressure loss, failure to prime, or internal wear from dry running
- Systems requiring reliable positive displacement fluid transfer where consistent pump output is critical
Specifications
- Compatible Pump Model: Galley Maid MR-7
- Part Type: Rubber Stator (inlet/nose housing side of pump)
- Material: Rubber (stator body)
- Mating Component: Galley Maid MR-7 Brass Rotor
- Mounting: 4-bolt flange, centered within nose housing
- Part Number: 04-1312
Frequently Asked Questions
Q: What causes the MR-7 stator to wear out or fail?
The most common cause is dry running — operating the pump without water present. This generates friction between the rubber stator and the brass rotor, leaving the stator's interior roughened or cracked. Normal wear over long service periods can also gradually reduce the stator's sealing ability against the rotor.
Q: Do I need to replace the rotor at the same time as the stator?
Not necessarily. After removing the old stator, inspect the brass rotor carefully. If the rotor surface is still smooth and free of deep scoring, it can often be cleaned with a wire brush and lacquer thinner and reused. However, if significant wear or pitting is visible, replacing both components at the same time is the more cost-effective approach.
Q: Is any special tool required to install the MR-7 stator?
No specialized tools are needed. The stator is pressed into position over the rotor and centered among the four flange bolts, then the nose housing bolts are tightened uniformly to firm screwdriver tightness. A small amount of silicone grease applied to the stator interior and rotor surface before installation makes seating the stator easier and helps protect it during initial startup.
Q: Should I replace the water seal when replacing the stator?
Many experienced technicians recommend replacing the shaft seal whenever the pump is disassembled for stator service, since accessing the seal requires the same level of disassembly. This eliminates the need to re-open the pump shortly after if the seal begins to show age-related wear.
Q: How do I know the stator is the problem and not another pump component?
If the motor is confirmed to be running but the pump fails to build pressure, the stator is the most likely culprit. Remove the nose housing, break the stator loose from the rotor, and inspect the stator's interior surface. A healthy stator should feel smooth inside and fit snugly on the rotor. Any internal roughness, cracking, or looseness on the rotor is a clear indication that the MR-7 stator needs to be replaced.
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