Valve Overview

At NC Servo, our shop is equipped to service the MOOG D631-345C. We use a consistent process to restore each unit to working condition.

Why Repair With NC Servo

We stock common wear parts in-house, so most rebuilds don’t require outside sourcing. Less waiting, faster turnaround.

One-year warranty on all MOOG D631-345C valve repairs

Frequently Asked Questions

Yes, our standard 1-year parts and labor warranty is standard on all repairs. Details are provided with your service report.

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

Yes. We diagnose first, then provide a repair recommendation with our findings. No work begins without your approval.

If the main housing or board is intact, repair is usually the better option. We can restore most units to working condition with tested parts.

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

Rebuild Steps

We disassemble every valve, inspect it inside and out, and clean all moving parts. Components that fail inspection are swapped out before the valve is rebuilt and tested.

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

Diagnostic Testing

We carry out full diagnostics on every valve, including flow gain, leakage, pressure shift, and frequency testing. Our test facility supports performance logging and report generation. Our functional testing verifies spec-level operation.

Maintenance Tips

  • Perform fluid analysis to detect contamination early and prevent system damage.
  • Document all maintenance activities to track performance trends over time.
  • Flush the hydraulic system after any major repair to remove debris before reinstalling the MOOG D631-345C.

Start Your MOOG D631-345C Reconditioning Process

Request pricing, availability, and turnaround for your MOOG D631-345C. NC Servo provides experienced 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.