• 38422 Webb Dr Westland , MI 48185
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Repair Information
Third-Party Repair of Moog Servo Valves & Drives | NC Servo Technology
NC Servo Technology - Westland, Michigan 734-326-6666
NC Servo Technology Independent industrial repair facility

Independent Repair Shop. Not a Moog Service Center.

Third-Party Repair of Moog Servo Valves & Drives

Independent third-party repair of Moog servo valves, proportional valves, and servo drives, including the WinDrive T164. Component-level work backed by a 19,000+ unit in-house inventory we pull aftermarket and donor parts from. NC Servo is not affiliated with Moog Inc., not a Moog service center, and not authorized by Moog Inc. Working on this kind of hardware since 1975.

Get a Repair Quote All Valve Services
19,000+ unit inventory Deep parts pool we pull aftermarket replacements and donor components from.
13 dedicated test stands Hydraulic and electrical bench checks before a Moog unit ships back.
One-year warranty Standard on parts and workmanship for Moog repairs and rebuilt units.

Repair Service

What NC Servo does with Moog hardware

Moog spans servo valves used in flight simulators and motion platforms, proportional valves on industrial machinery, and servo drives in wind turbines and automation. The shop opens each unit, finds what failed, and rebuilds it at the component level.

Servo & proportional valves

Moog 760, 72, 728, and 30 series servo valves, plus D633 and D634 proportional units. Spool service, pilot stage work, and seal replacement on the bench.

Servo drives, including WinDrive T164

Component-level work on Moog servo drives. The WinDrive T164 (807A and 907A variants) gets power-stage diagnostics, gate-driver replacement, and resolver-interface checks.

Discontinued and legacy units

Older Moog valves and drives the OEM no longer services. If we have donor parts for the family, we can usually keep an older unit in service.

Moog Families

Moog product families on the bench

We are a small repair shop, not a Moog distributor. The families below are simply the ones that come through the door often enough to be familiar. If your unit is not listed, send the part number anyway.

760, 72, 728 series High-performance two-stage servo valves used in flight simulators, motion platforms, and aerospace test rigs.
30 series flow control Moog 30 series and 062F-style electrohydraulic servo valves for industrial flow control applications.
D633 / D634 proportional Proportional directional control valves used on concrete pumps, presses, and heavy industrial machinery.
WinDrive T164 servo drives Rack-mount servo drives (807A, 907A) used in wind-turbine pitch systems, industrial automation, and test rigs.

Common Failures

What goes wrong on a Moog valve or drive

A description of how the unit was acting before it quit helps the diagnosis, but a part number is often enough. The categories below cover the kinds of trouble that show up on Moog hardware.

Servo valve internals Spool wear, contamination scoring, pilot stage faults, internal leakage, or sluggish step response.
Drive electrical (T164 and similar) Power-stage damage, gate-driver failure, bus overvoltage, short circuit, or bridge overtemp faults.
Feedback and control Resolver loss, feedback signal noise, communication faults on CANbus or PROFIBUS lines.
Physical condition Heat damage, contamination on hydraulic units, corroded connectors, or evidence of prior repair attempts.

Path to Repair

From quote request to ship-back

Most jobs run through the same four steps. Lead time varies because some Moog repairs need parts pulled off a donor, so we only commit to timing once a tech has the unit.

Give us a call

Phone or email with whatever info you have on the Moog unit and the symptom. The shop picks up from there.

Bench review

Once the unit arrives, a tech opens it, inspects internals, and runs it on the appropriate test stand to confirm the fault.

Cost & approval

We call back with what the repair will cost and a rough turnaround. Nothing happens without your sign-off.

Repair & ship

Failed components are replaced, the unit is checked under pressure or load, and it ships back ready to install.

Hydraulic test stand with multiple gauges, valves, and fluid columns for valve performance testing

Bench Testing

How a Moog repair gets verified

Modern Moog valves and digital drives run on the Hagen-Busch test stand, which handles CANbus and PROFIBUS protocols. Older 30 and 70 series valves go on dedicated stands the shop has kept around for legacy work. Either way, a unit gets checked under pressure or load before it ships back.

  • Hagen-Busch stand for current Moog valves and digital servo drives.
  • Older legacy stands kept on hand for 30 series and discontinued models.
  • Flow, pressure, response time, and feedback signals checked against documented procedures.
  • Repair backed by a 1-year warranty on parts and workmanship.

Inventory & Parts Pool

A 19,000+ unit pool behind the bench

NC Servo's in-house inventory holds over 19,000 servo valves and drives accumulated since 1975. That pool is where the shop pulls aftermarket parts, donor components for older Moog hardware, and rebuilt units when a swap saves time over a fresh repair.

  • Aftermarket and donor parts pulled from the inventory to keep older Moog families running.
  • If we have a rebuilt match for your part number, trade in your old unit for a discount on the rebuilt.
  • No match on the shelf? We can suggest a comparable Moog or cross-brand option, or repair yours.
  • Rebuilt units carry the same 1-year warranty as a fresh repair.
Warehouse shelf with Moog valve and drive components at NC Servo Technology
Moog WinDrive T164-907A servo drive front panel with status indicators

Repair vs. Plant Side

What NC Servo handles, and what your team handles

NC Servo works on the Moog hardware itself: valve internals, coil and pilot stage work, and servo drive electronics. Putting it back on the machine and getting it running stay with your team.

  • Internal valve work: spool service, seal replacement, coil and pilot stage rebuild.
  • Drive electronics: power-stage, gate-driver, resolver-interface, and control-board work.
  • Drive comes back working in most cases; the rest of the install stays on your side.
  • Final machine validation and any tuning to the application stay on your side.

More on Moog Repair

Related pages and brands

More reading on valve and drive repair, plus other brands the shop services that customers running Moog hardware often have on the same line.

Valve repair hub

The full range of servo and proportional valve repair NC Servo handles.

Servo drive repair hub

Drive and amplifier repair across brands, including Moog WinDrive families.

Repair vs replace

When component-level repair makes sense versus buying new or rebuilt.

Parker servo valves

Another servo-valve brand the shop services. Worth a look if you have mixed-brand hardware on the line.

Need a Moog unit looked at?

Give us a call with the part number, a photo of the nameplate, or a fault code off the drive display. We will check the shelf, and if we have a rebuilt match you can swap your old one for a discount. If we do not, we can suggest a comparable unit or repair the one you have.

Give Us a Call

FAQ

Common questions about Moog repair

A few things customers ask before sending a unit in. Anything not covered, give us a call at 734-326-6666.

Is NC Servo affiliated with Moog Inc.?

No. NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by Moog Inc. All Moog trademarks are the property of their respective owners.

Which Moog products do you cover?

Moog servo valves (760, 72, 728, 30, and related series), proportional valves (D633, D634, and similar), and servo drives including the WinDrive T164 (807A, 907A variants). Send a part number to confirm coverage on anything not listed.

Do you repair Moog WinDrive T164 servo drives?

Yes. Component-level repair on the WinDrive T164 including 807A and 907A variants. Common faults handled: power-stage damage, gate-driver failure, bus overvoltage, short circuit, resolver loss, and bridge overtemp. Rebuilt T164 units are sometimes available from stock.

Can NC Servo recover programs or drive parameters from a failed Moog drive?

Most failures are hardware, and the unit comes back working with its program intact. Corrupted programs are rare; if one is already corrupted before the unit reaches us, that's the one thing we can't recover.

How long does a Moog repair take?

It varies. NC Servo is a small independent shop, and lead time depends on the unit, what is wrong with it, and whether parts have to come off a donor. Give us a call once the unit ships in, and we can give a current estimate after a tech has looked at it.

What happens if the valve or drive is beyond economic repair?

If the unit is not fixable, we will let you know and help source a replacement: a rebuilt match if we have one on the shelf, or a comparable Moog or cross-brand alternative.

What is the warranty on a Moog repair?

One year on parts and workmanship for both repairs and rebuilds. Standard exclusions apply for contamination on valves and for power surges, environmental damage, and software-driven faults on drives.

NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by Moog Inc. or any related entities. Moog, WinDrive, and all other brand names, model numbers, and trademarks referenced on this page are the property of their respective owners and are used solely to identify equipment serviced by NC Servo Technology. NC Servo does not represent that any repair meets Moog Inc.'s proprietary specifications or factory standards. Final installation, parameter loading, system validation, and operational compliance remain the responsibility of the customer, OEM, or qualified integrator.

Moog Products We Service

2734 models available

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