Repair Procedure

Each MOOG D631-334C undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

Independent Repair Facility

Unlike OEM shops, we use our own inventory to handle most rebuilds. That cuts down on lead time and gets your unit back faster.

50+ years of expertise in MOOG D631-334C Valve Repair

Frequently Asked Questions

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.

Yes, rush service is available for an additional fee. Let us know your deadline when you submit your request.

Send the unit in whatever condition it’s in. We clean everything during teardown before inspection begins.

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

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

Disassembly and Rebuild Procedure

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

  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Final Performance Verification: After reassembly, each valve undergoes bench-testing against published performance specs.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.

Hydraulic Testing Process

With our 13-stand test facility 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 spec-level operation.

Repair, Rebuild and Exchange Options

Beyond standard sales, we offer specialized overhauls for your MOOG D631-334C unit. Our disassembly process includes seal replacement and internal inspection, using only replacement replacement components.

Lead Times and Support

As a dedicated source for MOOG D631-334C services, NC Servo Technology targets quick resolution with typical lead times of 1 to 3 weeks. Benefit from our direct access to our technicians to keep your systems running smoothly.

In-House Inventory for MOOG D631-334C

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

  • Monitor operating temperatures to identify potential issues before failure occurs.
  • Keep a spare MOOG D631-334C on hand to minimize downtime during unplanned failures.
  • Store spare MOOG D631-334C valves in a clean, dry environment to prevent corrosion and contamination.

Request a Quote for Your MOOG D631-334C Maintenance

Request pricing, availability, and turnaround for your MOOG D631-334C. NC Servo Technology provides independent 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.