About This Unit

NC Servo Technology provides repair and reconditioning for the MOOG D631-343CNC. With in-house tooling and stocked parts, we keep turnaround times short.

Independent Repair Facility

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

One-year warranty on all MOOG D631-343CNC valve repairs

Frequently Asked Questions

You’ll hear from us either way. If it’s not repairable, we’ll return the unit and provide our findings.

Most repairs are completed within 1 to 3 weeks, depending on workload and parts availability.

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

Send it in for evaluation. We’ll inspect it and give you a repair-vs-replace recommendation based on the actual condition of the unit.

No cleaning required. Our repair process includes disassembly and cleaning of all components.

How We Rebuild This Valve

Our team disassembles each valve to assess internal wear. After ultrasonic cleaning, we install replacements and reassemble and verify operation.

  • 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.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.

Testing and Bench Verification

NC Servo Technology operates thirteen in-house test stands, including setups for proportional and servo valves. Every valve goes through performance and leak testing using industry-standard fluids including MIL-5606 and Skydrol. Our operational testing verifies consistent performance.

Additional MOOG D631-343CNC Services

Beyond standard maintenance, we offer specialized overhauls for your MOOG D631-343CNC unit. Our teardown process includes pressure testing and disassembly, using only new replacement components.

Maintenance Tips

  • Perform fluid analysis to detect contamination early and prevent system damage.
  • Check valve alignment carefully to prevent undue stress on internal components.
  • Keep a spare MOOG D631-343CNC on hand to minimize downtime during unplanned failures.

Get a Free Evaluation for Your MOOG D631-343CNC

Request pricing, availability, and turnaround for your MOOG D631-343CNC. NC Servo Technology provides warrantied repair with a 1-year warranty. Contact us to start 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.