Repair Procedure

Our process involves a teardown of your MOOG 78-140C, mineral bath cleaning, and reassembly with quality parts to restore operation.

About Our Shop

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

Specializing in MOOG 78-140C servo valve technology for over five decades

Frequently Asked Questions

In most cases, repair costs less than replacement, especially for legacy or OEM-specific models. We evaluate every unit and let you know what makes sense.

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

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

All repairs come with a one-year warranty. Contact us for specifics on your unit.

If a unit is beyond repair, we explain why and can discuss replacement or exchange options.

How We Rebuild This Valve

Every MOOG 78-140C gets a controlled teardown on our bench. We document condition, replace what’s needed, and reassemble to proper operating condition.

  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.
  • 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.
  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.

Hydraulic Testing Process

With over a dozen dedicated flow test stands 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 expert repair services for the MOOG 78-140C are trusted across various sectors including Defense, Marine, and Construction. We understand the unique demands of valves in these environments.

Repair, Rebuild and Exchange Options

Beyond standard sales, we offer specialized reconditioning for your MOOG 78-140C unit. Our disassembly process includes bench testing and reassembly to spec, using only new replacement components.

In-House Inventory for MOOG 78-140C

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

  • Store spare MOOG 78-140C valves in a clean, dry environment to prevent corrosion and contamination.
  • Keep a spare MOOG 78-140C on hand to minimize downtime during unplanned failures.
  • Inspect MOOG 78-140C seals regularly to prevent leaks and maintain performance.

Start Your MOOG 78-140C Reconditioning Process

Request pricing, availability, and turnaround for your MOOG 78-140C. NC Servo provides warrantied repair with a 1-year warranty. Contact us to request 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.