Repair Procedure

Each MOOG D634-501 undergoes reconditioning — disassembly, parts replacement, reassembly, and bench testing before shipment.

About Our Shop

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

Frequently Asked Questions

We recommend sending pictures, especially if the model number is unclear or there is visible damage.

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

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

All repairs come with a 12-month warranty on parts and labor. Contact us for specifics on your unit.

Standard turnaround is 1-3 weeks. Rush options are available for time-sensitive situations.

Rebuild Steps

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

  • Teardown: Every valve is disassembled for internal 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.
  • Cleaning: Units go through a mineral bath, with ultrasonic cleaning used for delicate internals.

Leak and Performance Testing

NC Servo operates over a dozen dedicated flow test stands, including setups for proportional and servo valves. Every valve goes through performance and leak testing using a range of hydraulic fluids like Skydrol and MIL-5606. Our pre-shipment testing verifies consistent performance.

Performance Data

Every MOOG D634-501 we service is tested under operating environments. Our diagnostics verify performance against published specifications. Performance data and Specification sheets are available for purchase upon request.

Additional MOOG D634-501 Services

Beyond standard sales, we offer specialized repairs for your MOOG D634-501 unit. Our teardown process includes spool evaluation and leak testing, using only replacement replacement components.

Lead Times and Support

As a focused repair facility for MOOG D634-501 services, NC Servo targets quick resolution with typical lead times of 1 to 3 weeks. Benefit from our dedicated support team to keep your systems running smoothly.

Maintenance Tips

  • Inspect MOOG D634-501 seals regularly to prevent leaks and maintain performance.
  • Flush the hydraulic system after any major repair to remove debris before reinstalling the MOOG D634-501.
  • Check valve alignment carefully to prevent undue stress on internal components.

Request a Quote for Your MOOG D634-501 Maintenance

Request pricing, availability, and turnaround for your MOOG D634-501. NC Servo provides experienced repair with a 1-year warranty. Contact us to start 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.