Valve Overview

At NC Servo, our shop is equipped to service the MOOG 77-126. We use a consistent process to restore each unit to working condition.

Inspection and Repair Process

Each MOOG 77-126 undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

Frequently Asked Questions

Yes. Our repairs include a 12-month warranty on parts and labor covering parts and labor.

Inspection and root-cause analysis are part of our standard process. We identify the issue before starting any repair work.

Not required, but removing excess oil or loose debris before packing helps keep things clean in transit.

We can often prioritize urgent jobs. Note it on your request form and we’ll let you know what’s possible.

Yes. If the unit can’t be repaired, we contact you with options before doing anything further.

Why Repair With NC Servo

Our technicians work on industrial components like the MOOG 77-126 daily. That hands-on repetition builds the kind of experience that speeds up diagnosis and reduces rework.

Specializing in MOOG 77-126 servo valve technology for over five decades

Disassembly and Rebuild Procedure

The repair process for the MOOG 77-126 includes disassembly, diagnostic review, and replacement of failed seals, spools, or other elements. Final assembly includes leak and function testing.

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

Diagnostic Testing

Each MOOG 77-126 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 proper functionality.

Performance Data

Every MOOG 77-126 we service is tested under operating environments. Our diagnostics verify performance against published specifications. Performance data and Cycle life data are available for purchase upon request.

Additional MOOG 77-126 Services

Beyond standard maintenance, we offer specialized repairs for your MOOG 77-126 unit. Our teardown process includes disassembly and spool evaluation, using only new replacement components.

Maintenance Tips

  • Document all maintenance activities to track performance trends over time.
  • Keep hydraulic fluid clean and at proper levels for consistent valve operation.
  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.

Request a Quote for Your MOOG 77-126 Maintenance

Request pricing, availability, and turnaround for your MOOG 77-126. NC Servo provides warrantied repair with a 1-year warranty. Contact us to schedule 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.