About This Unit

At NC Servo, our shop is equipped to service the SLI 51400. We use a consistent process to restore each unit to working condition.

About Our Shop

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

Specializing in SLI 51400 servo valve technology for over five decades

Frequently Asked Questions

We regularly work on units with missing labels. Send us a few images and any visible part numbers, and we can usually match it.

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

Turnaround time varies by model and condition. Contact us for a timeline specific to your unit.

Yes. Our repairs include a one-year warranty covering parts and labor.

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

Repair Process

Once a valve arrives, we tear it down fully, examine key surfaces, and replace worn or damaged parts using components we stock in-house, cutting out OEM lead times.

  • Complete Disassembly: The unit is disassembled and all parts are laid out for individual inspection.
  • Seal and Gasket Replacement: Worn seals and gaskets are replaced with new components during every rebuild.
  • Leak and Pressure Testing: The reassembled unit is leak-tested and pressure-tested to verify it meets published specs.
  • Final Performance Verification: After reassembly, each valve is bench-tested against published performance specifications.

Hydraulic Testing Process

Each SLI 51400 is tested on a dedicated flow bench before it ships. We check pressure, flow, leakage, and response characteristics against published specifications. Our functional testing verifies spec-level operation.

Repair, Rebuild and Exchange Options

Beyond standard refurbishment, we offer specialized overhauls for your SLI 51400 unit. Our teardown process includes spool evaluation and pressure testing, using only new replacement components.

Lead Times and Support

As a specialist for SLI 51400 services, NC Servo targets quick resolution with typical lead times of 1 to 3 weeks. Benefit from our direct access to our technicians to keep your systems running smoothly.

Parts and Inventory

With more than 17,000 valve units in inventory, we can often provide faster turnaround by sourcing parts in-house rather than waiting on OEM lead times.

Maintenance Tips

  • Flush the hydraulic system after any major repair to remove debris before reinstalling the SLI 51400.
  • Perform fluid analysis to detect contamination early and prevent system damage.
  • Check system pressure regularly to verify it stays within the SLI 51400 rated operating range.

Let Us Repair Your SLI 51400

Request pricing, availability, and turnaround for your SLI 51400. NC Servo provides warrantied 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 SLI or any original equipment manufacturer (OEM), nor do we claim to be a SLI 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.