Independent third-party repair of servo valves used in 6-DOF Stewart platform motion bases on commercial and military flight simulators. Component-level rebuild and bench testing on Moog, Parker, Rexroth, and Vickers servo valves used in commercial and military full-flight simulator motion bases.
Each unit is opened, inspected, and rebuilt at the component level. Failed parts are pulled from inventory or from donor units in the in-house pool. Bench verification before ship.
N210
Pilot stage rebuild
Nozzle flapper and torque motor pilot stages cleaned, aligned, and trimmed. Null bias verification on the hydraulic stand.
N220
Spool & sleeve service
Spool wear, contamination scoring, lap restoration, and internal leakage checks on simulator-grade valve bodies.
N230
Coil & feedback work
Burned drive coil rebuild, feedback wire repair, and LVDT verification on closed-loop servo valve bodies.
N240
Bench testing
Hagenbusch and older-style hydraulic stands. Frequency response, hysteresis, null shift, and step response data available for purchase.
N250
Donor parts service
Stock is hit or miss, but legacy simulator hardware shows up often enough that we can pull from past jobs when we have a match. Ask about a specific part number.
N260
Repair scope
Component-level hardware work only. Simulator qualification, FAA / EASA sign-off, and motion tuning stay with the customer or training-center integrator.
Nozzle plugging, flapper damage, jet alignment after a contamination event, and pilot-pressure null shift after long service.
Spool and body
Spool wear, contamination scoring on lap surfaces, sticky spool action, and internal leakage past the spool.
Coil and feedback
Burned drive coils after surge events, feedback wire wear, LVDT signal drift, and signal-path component failures.
Connector and electrical
Damaged connectors, cable strain at the entry point, contamination on the connector pins after years of motion-base service.
N500 Workflow
From part number to ship-back
Same four-step path through the shop whether the unit came off a Type D commercial simulator or a 25-year-old military training device.
N510
Get in touch
Call or email with the part number, simulator make, and a photo of the nameplate if it helps.
N520
Bench review
Tech opens the unit, inspects pilot and spool, and runs it on the hydraulic stand to confirm what failed.
N530
Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
N540
Repair, test, ship
Failed components replaced from inventory or off donors, valve verified under pressure, and shipped back.
N600 Common questions
Common questions about motion-base valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page in the brand list above.
What types of flight simulator servo valves do you repair?
Servo valves used in 6-DOF Stewart platform motion bases: Moog 728, 760, 72, and D633 series; Parker D1FP and D3FP; Rexroth 4WS and 4WRPH; and Vickers SM-4. All come off the bench for rebuild.
What simulator brands do these valves come off of?
CAE, FlightSafety International, L3Harris, Frasca, TRU Simulation + Training, Thales, Indra, Alsim, and Precision Flight Controls. NC Servo is not affiliated with any simulator OEM. We service the valve hardware that comes through the bench.
Can you repair valves from older simulators no longer supported by the OEM?
Yes. Discontinued Moog 72-series, older Parker D1FP models, and early Rexroth 4WS valves are common at the bench. Stock for legacy simulator hardware is hit or miss, but parts often turn up from past jobs when we have a match. Ask about a specific part number.
Do you provide motion-base programming or simulator parameter setup?
No. NC Servo handles bench-level component repair on the valve hardware only. PLC programming, motion-controller setup, motion-cue tuning, and simulator qualification stay with the customer or training-center integrator.
Do you provide test data with the repair?
Each repaired valve is bench-tested before it ships. Frequency response, hysteresis, null bias, step response, and other performance data are available for purchase.
How long does a repair usually take?
Lead time varies job to job, partly because parts are often pulled from donor boards. Give us a call with the part number and the situation.
What is the warranty?
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for contamination, improper installation, and out-of-spec operation. Flushing and filtering the hydraulic system before reinstalling a repaired valve is recommended.
N700 More from NC Servo
Related repair coverage
The aerospace hub, related industry pages, and the brand pages most-tied to flight-simulator motion bases.
Give us a call or send a part number with the simulator make and the symptom. We'll check the donor pool, suggest a rebuilt match if we have one, and walk through repair or cross-brand options if we don't.
