Key Details

NC Servo provides repair and reconditioning for the MOOG 770-558. With in-house tooling and stocked parts, we keep turnaround times short.

How We Repair Your Unit

Each MOOG 770-558 undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

Frequently Asked Questions

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

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

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

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

About Our Shop

We stock common wear parts in-house, so most rebuilds don’t require outside sourcing. Less waiting, faster turnaround.

One-year warranty on all MOOG 770-558 valve repairs

Rebuild Steps

The repair process for the MOOG 770-558 includes disassembly, diagnostic review, and replacement of failed seals, spools, or other elements. Final assembly includes leak and function testing.

  • 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.
  • Complete Disassembly: The unit is disassembled and all parts are laid out for individual inspection.
  • Final Performance Verification: After reassembly, each valve undergoes bench-testing against published performance specs.

Diagnostic Testing

We carry out full diagnostics on every valve, including flow gain, leakage, pressure shift, and frequency testing. Our test facility supports performance logging and report generation. Our functional testing verifies proper functionality.

Industries We Serve

Our reliable repair services for the MOOG 770-558 are trusted across various sectors including Defense, Automotive, and Construction. We understand the unique demands of valves in these environments.

Technical Specifications

Every MOOG 770-558 we service is tested under typical applications. Our diagnostics verify performance against published specifications. Cycle life data and Technical diagrams are available for purchase upon request.

Additional MOOG 770-558 Services

Beyond standard refurbishment, we offer specialized overhauls for your MOOG 770-558 unit. Our overhaul process includes disassembly and seal replacement, using only new replacement components.

Data Sheets & Reports

For detailed insights into your MOOG 770-558, we can provide access to repair records and service logs. This transparency offers you compliance assurance and aids in long-term maintenance planning.

Maintenance Tips

  • Store spare MOOG 770-558 valves in a clean, dry environment to prevent corrosion and contamination.
  • Check system pressure regularly to verify it stays within the MOOG 770-558 rated operating range.
  • Perform fluid analysis to detect contamination early and prevent system damage.

Ready to Restore Your MOOG 770-558?

Request pricing, availability, and turnaround for your MOOG 770-558. NC Servo provides experienced 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.