Pilot stage rebuild
Torque motor pilot stages on Moog D660 / D661 / D662 valves cleaned, aligned, and trimmed against documented procedure.
Netstal Servo Valve Repair & Bench Test
Independent third-party repair of servo and proportional valves on Netstal injection molding machines. SynErgy, ELION, EVOS, and PET-LINE platforms running Moog D661 / D662 / G761 and Bosch Rexroth hardware rebuilt at the component level on the bench. One-year warranty on parts and workmanship.
Where Netstal Valves Sit
Four Netstal machine contexts
Netstal (now part of the KraussMaffei Group) builds high-performance injection molding machines for PET preform production, thin-wall packaging, and accuracy molding. Below are four common Netstal platforms where servo valves end up at the bench.
01
SynErgy series (175–750 tons)
SynErgy 1750 through 7500. Moog D661, D662, and G761 servo valves come off these for rebuild.
02
ELION series (80–420 tons)
All-electric machines with auxiliary hydraulics. Bosch Rexroth proportional valves come through the bench from these machines.
03
EVOS hybrid (500–750 tons)
Hybrid servo-hydraulic frames. Moog and Rexroth servo and proportional valves come off these for rebuild.
04
PET-LINE preform systems
PET preform production built on the SynErgy platform. Moog D661 / D662 servo valves come off these for rebuild.
What NC Servo Does
Component-level rebuild on Netstal valves
Each unit is opened, cleaned, inspected, and rebuilt at the component level. Failed parts come from inventory or off donor units. Bench verification before ship.
Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on accumulator charging and injection valves run hard on PET-LINE systems.
Coil & LVDT work
Burned drive coils replaced, LVDT feedback verified, and signal-path components checked on closed-loop bodies.
Bench testing
Hagen-Busch and older-style hydraulic stands. Flow, null, and dynamic response verified before ship.
Donor parts service
Large in-house pool of Moog and Rexroth donor units. Aftermarket and donor parts fill gaps the OEM no longer supports.
Hardware repair scope
NC Servo handles the valve hardware. PLC programming, parameter setup, and machine-side controller work stays with the customer or OEM.
Brands
Valve brands serviced on Netstal machines
Common brands on Netstal hydraulic circuits. Click through for the dedicated brand page.
Common Faults
What usually shows up on Netstal valves
Netstal's high-speed injection systems run servo valves harder than typical molding hardware. Common failure categories below.
| Spool contamination | Spool sticking and erratic response from contaminated hydraulic oil on high-cycle servo bodies pulled from PET applications. |
|---|---|
| Torque motor degradation | Burnout or insulation breakdown on Moog D661 / D662 torque motor coils. Often driven by electrical spikes, contamination, or thermal stress in high-cycle systems. Result is loss of valve control or null shift. |
| Spool & sleeve wear | High-frequency cycling on accumulator charging and injection valves accelerates spool wear. Internal leakage, reduced response, and pressure control issues follow. |
| Accumulator valve fatigue | Specific to SynErgy and PET-LINE systems. Repeated high-speed accumulator charging cycles stress G761 and D662 valves. Performance degradation builds gradually before a hard fail. |
Workflow
From part number to ship-back
Same four-step path through the shop whether the unit is a Moog D661 off a SynErgy or a Rexroth proportional off an EVOS.
-
01
Get in touch
Call or email with the part number, machine model (SynErgy 4000, ELION 280, etc.), and a photo of the nameplate if it helps.
-
02
Bench review
Tech opens the unit, inspects pilot, spool, and coil, and runs it on the hydraulic stand to confirm what failed.
-
03
Cost & approval
We call back with the cost and a rough turnaround. Nothing is started without your sign-off.
-
04
Repair, test, ship
Failed components replaced from inventory or off donors, the valve verified under pressure, and shipped back.
FAQ
Common questions about Netstal valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page in the brand list above.
Do you provide Netstal machine programming or software configuration?
No. We repair hardware components only: servo valves, proportional valves, and servo drives at the component level. We do not provide PLC programming, parameter configuration, software services, or system integration. If parameters are stored in external controllers, the customer or OEM configures them after the hardware repair.
Can you repair servo valves from older Netstal machines?
Yes. Legacy SynErgy units and discontinued series come through the bench regularly. Even for obsolete valves, we can usually source or fabricate replacement components from inventory or donor pool.
What do you handle on Moog D661 / D662 valves?
Pilot stage cleaning and trim, torque motor coil rebuild, spool and sleeve service, LVDT verification, and full bench test. Both two-stage and three-stage Moog units come through the bench.
How do I know if my valve is repairable or needs replacement?
Send the unit in for evaluation. The tech opens it on the bench, inspects pilot and spool, and lets you know what is fixable and what isn't. Most servo valve failures are repairable.
What if my valve is beyond economic repair?
If the valve isn't fixable, we'll let you know and help source a replacement.
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.
More from NC Servo
Related repair coverage
Other molding-machine builder pages, the broader category hubs, and the brand pages most relevant to Netstal.
Injection molding hub
All molding-machine builder pages: SynErgy, Toshiba, UBE, Van Dorn Demag, and more.
Valve repair hub
Full directory of 20+ valve brands with dedicated pages.
Moog brand page
Moog 760, 30, D633, D661, D662, G761 servo valves and Moog drives.
Bosch Rexroth brand page
4WRPEH, 4WRSE, 4WRZ, and other Rexroth proportional and servo valves.
Industrial valve repair
Component-level repair across hydraulic and proportional valve hardware.
Hydraulic repair services
Wider hydraulic repair coverage: pumps, drives, and valve work in one shop.
What is a servo valve?
Plain-English explainer on electrohydraulic servo valves and how they relate to proportional hardware.
What is a proportional valve?
How proportional and servoproportional valves differ from true servo valves, and what gets done at the bench.
Netstal valve down? Send a part number
Give us a call or send a part number with the machine model and a quick description of what the valve is doing. We'll check inventory, suggest a rebuilt match if we have one, and walk through repair options if we don't.