Valve Overview

We’ve serviced hundreds of MOOG D631-176C units over the years. Each one goes through the same controlled teardown, parts replacement, and testing process.

Independent Repair Facility

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

One-year warranty on all MOOG D631-176C valve repairs

Frequently Asked Questions

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

If the main housing or board is intact, repair is usually the better option. We can restore most units to working condition with tested parts.

Yes. We diagnose first, then provide a repair recommendation with our findings. No work begins without your approval.

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

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

Repair Process

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

  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.
  • Final Performance Verification: After reassembly, each valve is bench-tested against published performance specifications.

Testing and Bench Verification

NC Servo Tech operates our 13-stand test facility, including setups for proportional and servo valves. Every valve goes through performance and leak testing using a range of hydraulic fluids like Skydrol and MIL-5606. Our pre-shipment testing verifies proper functionality.

Industries We Serve

Our trusted repair services for the MOOG D631-176C are trusted across various sectors including Oil & Gas, Aerospace, and Plastics & Injection Molding. We understand the unique demands of valves in these environments.

Repair, Rebuild and Exchange Options

Beyond standard maintenance, we offer specialized repairs for your MOOG D631-176C unit. Our disassembly process includes flow verification and seal replacement, using only new replacement components.

Maintenance Tips

  • Flush the hydraulic system after any major repair to remove debris before reinstalling the MOOG D631-176C.
  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.
  • Replace inline filters according to maintenance schedules to maintain proper flow rates.

Ready to Restore Your MOOG D631-176C?

Request pricing, availability, and turnaround for your MOOG D631-176C. NC Servo Tech provides experienced repair with a 1-year warranty. Contact us to schedule 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.