How We Repair Your Unit

Our process involves a teardown of your MOOG D634-1001, ultrasonic cleaning, and reassembly with quality parts to restore operation.

Why Repair With NC Servo

Unlike OEM shops, we use our own inventory to handle most rebuilds. That cuts down on lead time and gets your unit back faster.

17,000+ valves in stock including MOOG D634-1001 exchange units

Frequently Asked Questions

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

Warranty coverage of a one-year warranty is included with every repair we complete.

Yes, rush service is available for an additional fee. Let us know your deadline when you submit your request.

Yes. Send us photos of the unit from multiple angles. Our team has serviced thousands of models and can often ID them visually.

Photos help us confirm the unit type and speed up intake. You can upload them through our quote request form.

How We Rebuild This Valve

The repair process for the MOOG D634-1001 includes disassembly, diagnostic review, and replacement of failed seals, spools, or other elements. Final assembly includes leak and function testing.

  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.
  • Final Performance Verification: After reassembly, each valve undergoes bench-testing against published performance specs.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Teardown: Every valve is disassembled for internal inspection.

Diagnostic Testing

With our 13-stand test facility 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 operational testing verifies proper functionality.

Performance Data

Every MOOG D634-1001 we service is tested under real-world conditions. Our diagnostics verify performance against published specifications. Technical diagrams and Cycle life data are available for purchase upon request.

Maintenance Tips

  • Schedule preventive maintenance intervals based on duty cycle, not just calendar time.
  • Document all maintenance activities to track performance trends over time.
  • Check valve alignment carefully to prevent undue stress on internal components.

Ready to Restore Your MOOG D634-1001?

Request pricing, availability, and turnaround for your MOOG D634-1001. NC Servo Tech provides hands-on repair with a 1-year warranty. Contact us to schedule your repair.

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NC Servo Tech 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.