Valve Overview

Whether the issue is age, wear, or contamination, the MOOG D633-536B can often be restored. NC Servo applies the same structured approach to every rebuild.

Why Repair With NC Servo

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

Specializing in MOOG D633-536B servo valve technology for over five decades

Frequently Asked Questions

No cleaning required. Our repair process includes disassembly and cleaning of all components.

Even if the tag is worn off, we can often match the unit based on shape, size, and internal configuration.

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

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

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

Rebuild Steps

Each valve goes through teardown to expose wear and buildup. After mineral bath cleaning, we replace damaged parts and reassemble the unit to spec.

  • 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.
  • In-House Parts Sourcing: Many repairs use components sourced from our inventory of 17,000+ units.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.

Diagnostic Testing

NC Servo operates thirteen in-house 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.

Turnaround and Shipping

As a dedicated source for MOOG D633-536B services, NC Servo targets quick resolution with typical lead times of 1 to 2 weeks. Benefit from our responsive technical support to keep your systems running smoothly.

Maintenance Tips

  • Keep hydraulic fluid clean and at proper levels for consistent valve operation.
  • Replace inline filters according to maintenance schedules to maintain proper flow rates.
  • Use only manufacturer-recommended hydraulic fluids to protect internal valve surfaces.

Get an Expert Repair for Your MOOG D633-536B

Request pricing, availability, and turnaround for your MOOG D633-536B. 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.