• 38422 Webb Dr Westland , MI 48185
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% O1975 · NC Servo Technology Servo & Proportional Valve Repair Westland, Michigan · Est. 1975 Est. 1975

Servo Valve & Proportional Valve Repair Specialists

Independent repair facility for servo valves, proportional valves, servo drives, and industrial electronic controls — since 1975.

Request a Quote Call 734-326-6666
Eddie Harmon of NC Servo Technology testing a proportional valve on the Hagenbusch test stand
Fig. 01 — Eddie Harmon on the Hagenbusch proportional stand, Westland MI
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Years in Operation
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Parts in Stock
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Test Stands
24hr
Rush Available

N050 Find your part

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Search 19,000+ parts in stock — or send the number for a quote: repair it, buy it, or we find it.

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    N100 What we do

    Industrial valve & electronic
    repair, done right

    Repair, rebuild, and testing for servo valves, proportional valves, servo drives, and amplifiers — standard or expedited turnaround.

    All services
    Fig. 02 / Valves Technician performing hydraulic valve repair on an industrial servo valve

    Servo & Proportional Valve Repair

    Expert hydraulic valve repair, rebuild, and exchange. We support discontinued and hard-to-find models most shops can't handle.

    Explore valve services
    Fig. 03 / Electronics Circuit board of an industrial servo drive under repair

    Servo Drive & Amplifier Repair

    Servo drives, controllers, and servo amplifiers serviced to OEM standards or better — with CANbus, PROFIBUS, and EtherCAT support.

    Explore drive services
    Fig. 04 / Custom Electronics testing station used for custom repair solutions

    Custom & Legacy Solutions

    Retrofitting, system design, and engineering consultation for non-standard applications and legacy hydraulic system upgrades.

    Discover custom work

    N200 How it works

    Your valve, step by step

    Every unit follows the same documented path through our Westland facility — one program, six blocks.

    N210

    Receive

    Ship us your unit with a part number. We log it and confirm receipt.

    N220

    Diagnose

    Teardown and failure analysis. For digital valves, we extract and store the onboard program first.

    N230

    Quote

    Lead time and pricing, typically within one business day. No work without your approval.

    N240

    Repair

    Rebuild with OEM, aftermarket, or refurbished parts per your requirements.

    N250

    Bench-Test

    Tested on one of 13 stands with DTE Lite, MIL-5606, or Skydrol. Graphs available for purchase.

    N260

    Ship

    Digital parameters reloaded and verified. Unit arrives ready to install.

    N250 Live from the bench

    Real data, not stock charts

    An actual test run from our bench — a Rexroth 4WRKE25 proportional valve, Lab 6422. Switch tests, hover the trace: every point is measured. Graphs like these are available for purchase with your repair.

    N300 Why NC Servo

    Five decades of
    hands-on repair

    Independent of all OEMs — no affiliation, no agenda. Objective valve and drive repair backed by 50 years of experience.

    • N310

      Advanced In-House Testing

      13 dedicated test stands including a Hagenbusch Proportional Test Stand — no outsourced verification.

    • N320

      Transparent, Documented Results

      Every repaired valve is bench-tested before shipment. Performance graphs and detailed failure reports available for purchase.

    • N330

      We Fix What the OEM Won't

      We stock inventory for discontinued valves and have serviced obsolete models for decades.

    • N340

      Our Own Warranty

      All warranties are issued solely by NC Servo Technology and apply to every repair we perform.

    Facility capabilities
    Test stands13 in-house, incl. Hagenbusch Proportional Test Stand
    Test fluidsMobil DTE Lite · MIL-5606 · Skydrol
    Digital protocolsCANbus · PROFIBUS · EtherCAT — program extract & reload
    ComponentsServo valves · proportional valves · servo drives · amplifiers · controllers
    Brands serviced40+ manufacturers, incl. discontinued lines
    TurnaroundStandard · expedited · 24-hour rush
    Since1975 — Westland, Michigan
    Get Expert Advice

    N400 See us in action

    Advanced digital
    protocol servicing

    Valves with onboard electronics running CANbus, PROFIBUS, or EtherCAT protocols require specialized handling. We have the equipment and the experience to service them.

    Before any repair, we extract and store the valve's program. After repair, the original parameters are reloaded and verified — the unit ships ready to install.

    NC Servo Technology facility overview video preview

    N500 In stock & ready

    Browse our full inventory

    Over 19,000 servo valves, proportional valves, and electronic controls in stock and ready to ship.

    Shelves of industrial valves and electronic controls in stock

    All Inventory

    19,000+ valves and electronic controls

    Browse all
    Servo and proportional valves ready to ship

    Valves

    Moog, Rexroth, Parker and more — rebuilt and ready

    View valves
    Rack of servo drives and electronic control modules

    Electronic Controls

    Servo drives, amplifiers, and industrial electronics

    View electronics

    N600 Who we service

    Brands we repair

    Independent third-party repair for 40+ manufacturers — including discontinued lines the OEM no longer supports.

    Servo & Proportional Valves

    Moog Bosch Rexroth Rexroth Vickers Parker Atos Bosch Eaton Denison Abex Atchley CEI Duplomatic HR Textron Hydronorma Oilgear Yuken Van Dorn ASCO MTS Kawasaki Continental Star Sundstrand Tokimec Joucomatic Hydrolux Dynamic

    Servo Drives & Electronic Controls

    Allen-Bradley Fanuc Indramat Kollmorgen ABB Toshiba Siemens Yaskawa Mitsubishi Emerson Aerotech Electro-Craft Glentek Heldt & Rossi Pacific Scientific Ametek Animatics Delta

    N700 Customer reviews

    What our clients say

    ★★★★★

    "I've been in industrial hydraulic field service for 30 years. The owner took me through the entire operation, introduced me to his techs and spent over an hour with me. This is an American gem!"

    Tom Neighbors

    ★★★★★

    "Great experience with NC Servo. I asked for the impossible on a 1 day turnaround and somehow they did it. Friendly and fast. Great experience with all members of the staff."

    Larry Voss

    ★★★★★

    "Missy is an expert in her field. Very friendly and knowledgeable with brilliant turn around times. Overall experience with NC Servo has been stellar."

    Heather Gillespie

    ★★★★★

    "Thank you to NC Servo and Missy! We greatly appreciate the Service, Quality and Turnaround. We look forward to working with you in the future."

    Pamela Fay

    ★★★★★

    "I have been dealing with these guys for Servos (both new and repaired) for years with no issues."

    Earl Steenburg

    ★★★★★

    "Great communication and quick delivery! Item as described, packed well, and arrived on time."

    eBay Customer

    N800 Technical resources

    From our repair bench

    Practical guides written by the people who test and repair these components every day.

    All resources
    Ref. 01 — Decision guide

    Repair vs. Replace: What to Do With a Failing Servo Valve

    Read the guide     Ref. 02 — Troubleshooting

    Common Servo Valve Failure Causes — and How to Prevent Them

    Read the guide     Ref. 03 — Step-by-step

    How to Test a Servo Valve: A Practical Guide

    Read the guide

    N900 Common questions

    Servo valve repair FAQ

    What does the “NC” in NC Servo stand for?
    NC stands for numerical control — the programmed machine-tool automation technology that servo valves and servo drives made possible. NC Servo Technology has repaired these components since 1975.
    How long does servo valve repair take?
    We offer standard, expedited, and 24-hour rush turnaround options. Send your model number and we respond with lead time and pricing, typically within one business day.
    Do you repair discontinued or obsolete servo valves?
    Yes. Many OEMs discontinue service on older models. We maintain inventory for discontinued valves and have been servicing obsolete models for decades — if the manufacturer no longer supports it, we likely still do.
    Is my valve tested before it ships back?
    Every repaired valve is bench-tested before shipment on one of our 13 in-house test stands, including a Hagenbusch Proportional Test Stand. Performance graphs and detailed failure reports are available for purchase.
    Should I repair or replace a failing servo valve?
    It depends on the valve model, availability, and failure mode. Independent repair is often substantially more cost-effective than OEM replacement, especially for discontinued models with extended lead times. See our repair-vs-replace decision guide.
    Are you affiliated with Moog, Bosch Rexroth, or other manufacturers?
    No. NC Servo Technology is an independent third-party repair facility with no affiliation to any OEM. Brand names on this site are used for identification only. All warranties are our own.
    Can you service valves with onboard digital electronics?
    Yes. We service valves with integrated electronics running CANbus, PROFIBUS, or EtherCAT protocols. Before repair we extract and store the valve's program; after repair the original parameters are reloaded and verified.

    N990 Get a quote

    Ready when
    your line isn't.

    Send the form above with your part number — or call. We respond with lead time and pricing, typically within one business day.

    Request a Quote 734-326-6666

    38422 Webb Dr, Westland, MI 48185
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    Important Legal Notice

    Independent Third-Party Repair Facility: NC Servo Technology is an independent repair facility. We are not affiliated with, authorized by, endorsed by, or connected to any original equipment manufacturer (OEM) whose products or brand names appear on this website.

    Trademark Notice: All brand names, trademarks, logos, and part numbers mentioned on this website are used for identification and cross-reference purposes only and remain the property of their respective owners.

    Independent Services: Our repair services are performed independently using our own methods, tools, parts, and expertise. We are not an authorized service center for any manufacturers listed on this website.

    Warranties: All warranties provided are our own and are issued solely by NC Servo Technology. Warranty terms apply only to services performed by NC Servo Technology.

    Parts and Components: Replacement parts may be OEM parts, aftermarket parts, or refurbished components depending on availability and customer requirements.