Key Details

Whether the issue is age, wear, or contamination, the MOOG D631-734C can often be restored. NC Servo Tech applies the same structured approach to every rebuild.

Independent Repair Facility

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

Frequently Asked Questions

Standard turnaround is 1-3 weeks. Rush options are available for time-sensitive situations.

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

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

Yes. Our repairs include our standard 1-year parts and labor warranty covering parts and labor.

Yes. Our technicians can often identify units based on photos, dimensions, or manufacturer markings. Send a photo before shipping to speed up intake.

Rebuild Steps

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

  • 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.
  • 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.

Testing and Bench Verification

With thirteen in-house 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 consistent performance.

Common Applications

Our professional repair services for the MOOG D631-734C are trusted across various sectors including Paper & Pulp, Defense, and Oil & Gas. We understand the unique demands of valves in these environments.

MOOG D631-734C Specifications

Every MOOG D631-734C we service is tested under operating environments. Our diagnostics verify performance against published specifications. Specification sheets and Performance data are available for purchase upon request.

Repair, Rebuild and Exchange Options

Beyond standard refurbishment, we offer specialized repairs for your MOOG D631-734C unit. Our overhaul process includes mineral bath cleaning and disassembly, using only replacement replacement components.

In-House Inventory for MOOG D631-734C

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

  • Inspect MOOG D631-734C seals regularly to prevent leaks and maintain performance.
  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.
  • Perform fluid analysis to detect contamination early and prevent system damage.

Ready to Restore Your MOOG D631-734C?

Request pricing, availability, and turnaround for your MOOG D631-734C. NC Servo Tech provides experienced repair with a 1-year warranty. Contact us to set up 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.