How We Repair Your Unit

Each MOOG D656-428 undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

Independent Repair Facility

NC Servo Technology operates independently, so we’re not tied to manufacturer delays or restrictions. That means more flexibility when your system is down.

Factory-level test stands dedicated to MOOG D656-428 performance verification

Frequently Asked Questions

We give you a straight assessment after inspection. If repair doesn’t make sense, we’ll let you know and discuss alternatives.

We recommend sending pictures, especially if the model number is unclear or there is visible damage.

Standard turnaround is 1-3 weeks. Rush options are available for time-sensitive situations.

Expedited options are available depending on current scheduling. Contact us to discuss your timeline.

All repairs come with a one-year warranty. Contact us for specifics on your unit.

Disassembly and Rebuild Procedure

The process begins with disassembly and visual evaluation. We then clean, replace worn pieces, and reassemble the valve to restore its function.

  • Final Performance Verification: After reassembly, each valve undergoes bench-testing against published performance specs.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.

Diagnostic Testing

With over a dozen dedicated flow test stands and a Hagenbush proportional valve system, we verify flow curves, hysteresis, frequency response, and more. Performance reports and graphs are available for purchase on request. Our performance testing verifies consistent performance.

Industries We Serve

Our trusted repair services for the MOOG D656-428 are trusted across various sectors including Defense, Aerospace, and Paper & Pulp. We understand the unique demands of valves in these environments.

Repair, Rebuild and Exchange Options

Beyond standard maintenance, we offer specialized overhauls for your MOOG D656-428 unit. Our teardown process includes disassembly and mineral bath cleaning, using only replacement replacement components.

Parts and Inventory

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

  • Perform fluid analysis to detect contamination early and prevent system damage.
  • Conduct thorough visual inspections for wear or leaks during routine maintenance.
  • Replace inline filters according to maintenance schedules to maintain proper flow rates.

Schedule Your MOOG D656-428 Service Today

Request pricing, availability, and turnaround for your MOOG D656-428. NC Servo Technology provides hands-on repair with a 1-year warranty. Contact us to set up your repair.

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NC Servo Technology 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.