Independent third-party repair of servo and proportional valves on Arburg Allrounder injection molding machines: S Series, Hidrive, Hydronica, and Golden Edition. Bosch Rexroth 4WRPEH and Moog units rebuilt at the component level and verified on the same hydraulic stands the shop has run since 1975.
Each unit is opened, inspected, and rebuilt at the component level. Failed parts come from inventory or pulled off donor units. Bench verification before ship.
N210
Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on Rexroth 4WRPEH, 4WRSE, and Moog valve bodies.
N220
Coil & electronics rebuild
Burned proportional coils, integrated drive electronics, position sensor faults on 4WRPEH integrated cards.
N230
Pilot & torque motor
Pilot stage cleaning, torque motor null trim, and feedback wire repair on Moog D661 / D662 and Rexroth servo-proportional units.
N240
Bench testing
Hydraulic stands for flow-curve, hysteresis, frequency response, and leak verification. Test data available for purchase.
N250
Donor parts pool
19,000+ unit in-house pool with legacy 4WRP and early 4WRPE bodies for older Allrounder hardware the OEM no longer supports.
N260
Repair scope
Bench-level component work on the valve hardware. Allrounder PLC programming, parameter setup, and Selogica configuration stay with the customer or OEM.
Bosch Rexroth and Moog are common on Arburg valve circuits, with Parker and Vickers showing up on retrofits. Click through for the dedicated brand page.
Spool binding and wear in the sleeve from contamination, scored lap surfaces, sticky spool action, and internal leakage past the metering edges.
Coil & electronics
Burned proportional coils, failed integrated electronics on 4WRPEH cards, and erratic current-to-position behavior after voltage spikes or moisture ingress.
Seals & leakage
Hardened O-rings and dynamic seals causing internal cross-port leakage and external weeping at the body interface.
Hysteresis & dead-band
Dead-band growth on Rexroth 4WRPEH or 4WRSE spools that pulls repeatability off the valve.
N500 Workflow
From part number to ship-back
Same four-step path through the shop whether the unit is a Rexroth 4WRPEH proportional or a Moog servo valve off any Allrounder generation.
N510
Get in touch
Call or email with the part number, machine model, and a photo of the nameplate if it helps.
N520
Bench review
Tech opens the unit, inspects spool and electronics, 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 parts replaced from inventory or off donors, the valve verified under pressure, and shipped back.
N600 Common questions
Common questions about Arburg valve repair
Application-specific questions on Allrounder hydraulics. For brand-specific FAQs, see the dedicated brand pages linked above.
Do you repair both Bosch Rexroth and Moog valves used on Arburg machines?
Yes. Both brands come through the bench routinely. Pilot stage, spool work, coil rebuild, and electronics covered.
Can you work on older Allrounder valves the OEM no longer supports?
Yes. Legacy Bosch Rexroth 4WRP and early 4WRPE proportional valves from older Allrounder machines come through the bench. The donor pool covers most of the parts that are no longer available new.
What about Selogica programming or machine parameter setup?
That side of the work stays with the customer or with Arburg. NC Servo handles the valve hardware: spools, seals, coils, and electronics at the component level. PLC programming, Selogica controller configuration, and machine integration are out of scope.
Do you provide test data with the repair?
Each repaired valve is bench-tested on the hydraulic stand before it ships. Flow-curve, hysteresis, and leak data are available for purchase.
What if my Arburg valve is beyond economic repair?
If the body is past saving we will 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.
N700 More from NC Servo
Related repair coverage
The injection-molding hub, broader category hubs, and the brand pages tied to Arburg valve hardware.
Give us a call or send a part number with the machine model. 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.
