About This Unit

Whether the issue is age, wear, or contamination, the MOOG D661-318D can often be restored. NC Servo Tech applies the same structured approach to every rebuild.

About Our Shop

Our technicians work on industrial components like the MOOG D661-318D daily. That hands-on repetition builds the kind of experience that speeds up diagnosis and reduces rework.

Specializing in MOOG D661-318D servo valve technology for over five decades

Frequently Asked Questions

Helpful but not required. If you can photograph the label, connectors, and overall unit, it gives our team a head start.

Yes. Every unit goes through diagnostic testing and we provide an assessment before moving forward.

All repairs come with a 12-month warranty on parts and labor. Contact us for specifics on your unit.

Yes. If the unit can’t be repaired, we contact you with options before doing anything further.

If the main housing or board is intact, repair is usually the better option. We can restore most units to working condition with tested parts.

How We Rebuild This Valve

The repair process for the MOOG D661-318D includes disassembly, diagnostic review, and replacement of failed seals, spools, or other elements. Final assembly includes leak and function testing.

  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.
  • Teardown: Every valve is disassembled for internal inspection.
  • 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.

Hydraulic Testing Process

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 proper functionality.

Lead Times and Support

As a specialist for MOOG D661-318D services, NC Servo Tech targets quick resolution with typical lead times of 1 to 3 weeks. Benefit from our direct access to our technicians to keep your systems running smoothly.

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

  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.
  • Flush the hydraulic system after any major repair to remove debris before reinstalling the MOOG D661-318D.
  • Keep a spare MOOG D661-318D on hand to minimize downtime during unplanned failures.

Request a Quote for Your MOOG D661-318D Maintenance

Request pricing, availability, and turnaround for your MOOG D661-318D. NC Servo Tech provides independent repair with a 1-year warranty. Contact us to start your repair.

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NC Servo Tech 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.