Inspection and Repair Process

Our process involves a teardown of your MOOG D631-335, mineral bath and ultrasonic cleaning, and reassembly with quality parts to restore operation.

Why Repair With NC Servo

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

Frequently Asked Questions

It depends on the unit and scope of work. We provide an estimated timeline after initial evaluation.

Warranty coverage of our standard 1-year parts and labor warranty is included with every repair we complete.

Part of our intake includes troubleshooting to determine the failure point. We report findings before proceeding.

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

Even if the tag is worn off, we can often match the unit based on shape, size, and internal configuration.

How We Rebuild This Valve

Each valve goes through teardown to expose wear and buildup. After mineral bath cleaning, we replace damaged parts and reassemble the unit to spec.

  • 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.
  • 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.

Diagnostic Testing

NC Servo operates over a dozen dedicated flow test stands, including setups for proportional and servo valves. Every valve goes through performance and leak testing using standard test fluids to match your operational needs. Our performance testing verifies spec-level operation.

Technical Specifications

Every MOOG D631-335 we service is tested under operating environments. Our diagnostics verify performance against published specifications. Technical diagrams and Performance data are available for purchase upon request.

Additional MOOG D631-335 Services

Beyond standard sales, we offer specialized repairs for your MOOG D631-335 unit. Our overhaul process includes leak testing and pressure testing, using only replacement replacement components.

Lead Times and Support

As a specialist for MOOG D631-335 services, NC Servo targets quick resolution with typical lead times of 2 to 3 weeks. Benefit from our direct access to our technicians to keep your systems running smoothly.

Maintenance Tips

  • Perform fluid analysis to detect contamination early and prevent system damage.
  • Keep a spare MOOG D631-335 on hand to minimize downtime during unplanned failures.
  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.

Ready to Restore Your MOOG D631-335?

Request pricing, availability, and turnaround for your MOOG D631-335. NC Servo provides hands-on 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.