Inspection and Repair Process

We specialize in the overhaul of your MOOG D663-796, including the replacement of all necessary gaskets and worn components.

Independent Repair Facility

We stock common wear parts in-house, so most rebuilds don’t require outside sourcing. Less waiting, faster turnaround.

17,000+ valves in stock including MOOG D663-796 exchange units

Frequently Asked Questions

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

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

Warranty coverage of a 12-month warranty on parts and labor is included with every repair we complete.

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

Yes, rush service is available for an additional fee. Let us know your deadline when you submit your request.

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 is bench-tested against published performance specifications.
  • Teardown: Every valve is disassembled for internal inspection.
  • 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.

Hydraulic Testing Process

With our 13-stand test facility 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 operational testing verifies spec-level operation.

Stock Availability

With over 17,000 valves in stock, we can often provide faster turnaround by sourcing parts in-house rather than waiting on OEM lead times.

Maintenance Tips

  • Store spare MOOG D663-796 valves in a clean, dry environment to prevent corrosion and contamination.
  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.
  • Keep hydraulic fluid clean and at proper levels for consistent valve operation.

Request a Quote for Your MOOG D663-796 Maintenance

Request pricing, availability, and turnaround for your MOOG D663-796. NC Servo provides warrantied repair with a 1-year warranty. Contact us to start 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.