Valve Overview

The MOOG D631-336FA-4 is one of many models we routinely service. Our process includes disassembly, cleaning, and reassembly using reliable components.

Independent Repair Facility

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

In-house parts inventory eliminates OEM lead time delays for MOOG D631-336FA-4

Frequently Asked Questions

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

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

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

Yes. Photos of the nameplate and overall unit let us begin identification before it arrives, which speeds up the process.

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

Rebuild Steps

The process begins with disassembly and visual evaluation. We then clean, replace worn pieces, and reassemble the valve to restore its function.

  • 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.
  • Complete Disassembly: The unit is disassembled and all parts are laid out for individual inspection.

Diagnostic Testing

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 functional testing verifies consistent performance.

Common Applications

Our trusted repair services for the MOOG D631-336FA-4 are trusted across various sectors including Marine, Industrial Machinery, and Plastics & Injection Molding. We understand the unique demands of valves in these environments.

MOOG D631-336FA-4 Specifications

Every MOOG D631-336FA-4 we service is tested under real-world conditions. Our diagnostics verify performance against published specifications. Cycle life data and Technical diagrams are available for purchase upon request.

Additional MOOG D631-336FA-4 Services

Beyond standard sales, we offer specialized overhauls for your MOOG D631-336FA-4 unit. Our overhaul process includes spool evaluation and reassembly to spec, using only replacement 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

  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.
  • Keep hydraulic fluid clean and at proper levels for consistent valve operation.
  • Replace inline filters according to maintenance schedules to maintain proper flow rates.

Ready to Restore Your MOOG D631-336FA-4?

Request pricing, availability, and turnaround for your MOOG D631-336FA-4. 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.