Repair Procedure

Our repair process for the MOOG D633-318A begins with teardown and mineral bath cleaning to assess all components.

Why Repair With NC Servo

We’ve built our shop around one thing: industrial repair. With decades of hands-on experience and deep product knowledge, we deliver consistent results.

Specializing in MOOG D633-318A servo valve technology for over five decades

Frequently Asked Questions

Yes. Send us photos of the unit from multiple angles. Our team has serviced thousands of models and can often ID them visually.

Yes, a 12-month warranty on parts and labor is standard on all repairs. Details are provided with your service report.

Rush and priority service options exist. Availability depends on current workload, so contact us early.

In most cases, repair costs less than replacement, especially for legacy or OEM-specific models. We evaluate every unit and let you know what makes sense.

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

Repair Process

We rebuild every valve from the inside out: cleaning, inspection, parts replacement, reassembly, and bench testing.

  • 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.
  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.

Leak and Performance Testing

NC Servo Technology 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 functional testing verifies proper functionality.

Additional MOOG D633-318A Services

Beyond standard sales, we offer specialized overhauls for your MOOG D633-318A unit. Our overhaul process includes flow verification and reassembly to spec, using only new replacement components.

Stock Availability

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

Maintenance Tips

  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.
  • Check valve alignment carefully to prevent undue stress on internal components.
  • Store spare MOOG D633-318A valves in a clean, dry environment to prevent corrosion and contamination.

Get a Free Evaluation for Your MOOG D633-318A

Request pricing, availability, and turnaround for your MOOG D633-318A. NC Servo Technology provides warrantied repair with a 1-year warranty. Contact us to schedule 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.