Repair Procedure

Our process involves a teardown of your MOOG D663-317K, mineral bath cleaning, and reassembly with quality parts to restore operation.

About Our Shop

NC Servo specializes in both valves and electronic controls, which lets us operate without the delays of OEM service centers.

Specializing in MOOG D663-317K servo valve technology for over five decades

Frequently Asked Questions

We regularly work on units with missing labels. Send us a few images and any visible part numbers, and we can usually match it.

We confirm next steps with you if a unit can’t be rebuilt. No work proceeds without your approval.

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

Turnaround time varies by model and condition. Contact us for a timeline specific to your unit.

Not required, but removing excess oil or loose debris before packing helps keep things clean in transit.

How We Rebuild This Valve

The repair process for the MOOG D663-317K 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.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Final Performance Verification: After reassembly, each valve undergoes bench-testing against published performance specs.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.

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 spec-level operation.

Common Applications

Our trusted repair services for the MOOG D663-317K are trusted across various sectors including Paper & Pulp, Aerospace, and Industrial Machinery. We understand the unique demands of valves in these environments.

In-House Inventory for MOOG D663-317K

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

  • Store spare MOOG D663-317K valves in a clean, dry environment to prevent corrosion and contamination.
  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.
  • Document all maintenance activities to track performance trends over time.

Request a Quote for Your MOOG D663-317K Maintenance

Request pricing, availability, and turnaround for your MOOG D663-317K. NC Servo provides experienced 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.