Inspection and Repair Process

Each MOOG D651-155D undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

Why Repair With NC Servo

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

Specializing in MOOG D651-155D servo valve technology for over five decades

Frequently Asked Questions

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

We give you a straight assessment after inspection. If repair doesn’t make sense, we’ll let you know and discuss alternatives.

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

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

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

Rebuild Steps

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

  • Final Performance Verification: After reassembly, each valve is bench-tested against published performance specifications.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.
  • 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.

Hydraulic Testing Process

Each MOOG D651-155D is tested on a dedicated flow bench before it ships. We check pressure, flow, leakage, and response characteristics against published specifications. Our operational testing verifies spec-level operation.

Common Applications

Our trusted repair services for the MOOG D651-155D are trusted across various sectors including Industrial Machinery, Power Generation, and Defense. We understand the unique demands of valves in these environments.

Technical Specifications

Every MOOG D651-155D we service is tested under typical applications. Our diagnostics verify performance against published specifications. Technical diagrams and Specification sheets are available for purchase upon request.

Lead Times and Support

As a specialist for MOOG D651-155D services, NC Servo targets quick resolution with typical lead times of 1 to 2 weeks. Benefit from our direct access to our technicians to keep your systems running smoothly.

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

  • Keep hydraulic fluid clean and at proper levels for consistent valve operation.
  • Conduct thorough visual inspections for wear or leaks during routine maintenance.
  • Inspect MOOG D651-155D seals regularly to prevent leaks and maintain performance.

Get a Free Evaluation for Your MOOG D651-155D

Request pricing, availability, and turnaround for your MOOG D651-155D. NC Servo provides warrantied repair with a 1-year warranty. Contact us to set up your repair.

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NC Servo 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.