Teardown and Rebuild Steps

Our process involves a teardown of your MOOG D644-517, mineral bath and ultrasonic cleaning, and reassembly with quality parts to restore operation.

About Our Shop

Our technicians work on industrial components like the MOOG D644-517 daily. That hands-on repetition builds the kind of experience that speeds up diagnosis and reduces rework.

Specializing in MOOG D644-517 servo valve technology for over five decades

Frequently Asked Questions

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

Part of our intake includes troubleshooting to determine the failure point. We report findings before proceeding.

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

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

It depends on the unit and scope of work. We provide an estimated timeline after initial evaluation.

How We Rebuild This Valve

Once a valve arrives, we tear it down fully, examine key surfaces, and replace worn or damaged parts using components we stock in-house, cutting out OEM lead times.

  • 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.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.

Hydraulic Testing Process

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 pre-shipment testing verifies consistent performance.

Common Applications

Our reliable repair services for the MOOG D644-517 are trusted across various sectors including Marine, Steel & Metals, and Oil & Gas. We understand the unique demands of valves in these environments.

MOOG D644-517 Specifications

Every MOOG D644-517 we service is tested under typical applications. Our diagnostics verify performance against published specifications. Cycle life data and Specification sheets are available for purchase upon request.

Turnaround and Shipping

As a specialist for MOOG D644-517 services, NC Servo Technology targets quick resolution with typical lead times of 2 to 3 weeks. Benefit from our responsive technical support to keep your systems running smoothly.

Parts and Inventory

With more than 17,000 valve units in inventory, we can often provide faster turnaround by sourcing parts in-house rather than waiting on OEM lead times.

Maintenance Tips

  • Keep a spare MOOG D644-517 on hand to minimize downtime during unplanned failures.
  • Conduct thorough visual inspections for wear or leaks during routine maintenance.
  • Monitor operating temperatures to identify potential issues before failure occurs.

Get an Expert Repair for Your MOOG D644-517

Request pricing, availability, and turnaround for your MOOG D644-517. NC Servo Technology provides independent repair with a 1-year warranty. Contact us to schedule 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.