How We Repair Your Unit

Our process involves a teardown of your MOOG D631-728C, mineral bath cleaning, and reassembly with quality parts to restore operation.

Experience and Warranty

As a specialized repair facility, we have dedicated test equipment that general-purpose shops don’t. That means your MOOG D631-728C gets serviced by people who work on these units regularly.

Frequently Asked Questions

We can often prioritize urgent jobs. Note it on your request form and we’ll let you know what’s possible.

You can send it as-is. We handle all cleaning and preparation as part of our standard process.

If a unit is beyond repair, we explain why and can discuss replacement or exchange options.

Yes. We diagnose first, then provide a repair recommendation with our findings. No work begins without your approval.

Yes. Our technicians can often identify units based on photos, dimensions, or manufacturer markings. Send a photo before shipping to speed up intake.

Disassembly and Rebuild Procedure

Once a valve arrives, we tear it down fully, examine key surfaces, and replace worn or damaged parts using components we stock in-house, cutting out OEM lead times.

  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.
  • Teardown: Every valve is disassembled for internal inspection.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.

Testing and Bench Verification

We carry out full diagnostics on every valve, including flow gain, leakage, pressure shift, and frequency testing. Our test facility supports performance logging and report generation. Our functional testing verifies proper functionality.

Performance Data

Every MOOG D631-728C we service is tested under typical applications. Our diagnostics verify performance against published specifications. Specification sheets and Technical diagrams are available for purchase upon request.

Additional MOOG D631-728C Services

Beyond standard refurbishment, we offer specialized repairs for your MOOG D631-728C unit. Our overhaul process includes disassembly and leak testing, using only replacement replacement components.

Lead Times and Support

As a specialist for MOOG D631-728C services, NC Servo targets quick resolution with typical lead times of 1 to 2 weeks. Benefit from our responsive technical support to keep your systems running smoothly.

Stock Availability

With more than 17,000 valve units in inventory, we can often provide faster turnaround by sourcing parts in-house rather than waiting on OEM lead times.

Maintenance Tips

  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.
  • Document all maintenance activities to track performance trends over time.
  • Keep a spare MOOG D631-728C on hand to minimize downtime during unplanned failures.

Request a Quote for Your MOOG D631-728C Maintenance

Request pricing, availability, and turnaround for your MOOG D631-728C. NC Servo provides independent repair with a 1-year warranty. Contact us to request your repair.

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NC Servo is an independent third-party repair facility. We are not affiliated with, endorsed by, sponsored by, or authorized by MOOG or any original equipment manufacturer (OEM), nor do we claim to be a MOOG service center. All brand names, trademarks, model numbers, and part numbers referenced on this page are the property of their respective owners and are used solely for identification and compatibility purposes.