Pilot stage rebuild
Torque motor pilot stages, nozzle flapper, and pilot trim cleaned and aligned against documented procedures on Moog D661 and G761 valves.
Bekum Servo Valve Repair
Independent third-party component-level repair of servo and proportional valves used on Bekum blow molding machines. Moog D661 and G761 servo bodies, plus Rexroth and Parker proportional valves, come off BM, BA / BAE, BW, and legacy H-series machines for rebuild.
Where These Valves Sit
Four Bekum machine application contexts
Below are common Bekum machine families and the valve brands that come off them.
01
BM Series (continuous extrusion)
Moog D661 and G761 servo valves come off these machines for rebuild.
02
BA / BAE Series (shuttle)
Bosch Rexroth proportional valves and Moog servo bodies come through routinely.
03
BW Series (wheel)
Bosch Rexroth and Parker proportional valves come through for rebuild.
04
Legacy / H Series
Older Bekum hardware running discontinued Moog G761 and earlier Rexroth proportional valves.
What NC Servo Does
Component-level repair on Bekum valves
Each unit is opened, 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 the valve bodies that come off Bekum machines.
Coil & feedback work
Burned coil rebuild, feedback wire repair, and LVDT verification on closed-loop servo valve bodies.
Bench testing
Hagen-Busch and older-style hydraulic stands. Hysteresis, null shift, and step response data on request.
Donor parts service
Aftermarket and donor parts for legacy Bekum valves, including discontinued G761 bodies.
Repair scope
Bench-level component work on the valve hardware. PLC programming, machine setup, and integration stay with the customer or OEM.
Brands
Bekum servo valve brands serviced
Top brands seen on Bekum hydraulics. Click through for the dedicated brand page.
Common Faults
What usually shows up on Bekum valves
Common failure modes seen on Bekum valves at the bench.
| Spool & body | Spool wear, contamination scoring, sticky spool action, and internal leakage past the metering edges. |
|---|---|
| Pilot stage | Pilot null shift, nozzle plugging, and torque motor coil wear on Moog D661 / G761 servo bodies. |
| Coil & electronics | Burned proportional coils, failed integrated electronics, and erratic current-to-position behavior on Rexroth proportional bodies. |
| Seals & leakage | Hardened o-rings and dynamic seals causing internal cross-port leakage. |
Workflow
From part number to ship-back
Same four-step path through the shop whether the unit came off a Bekum BM line or a legacy H-series machine.
- 01
Get in touch
Call or email with the part number, machine make, and a photo of the nameplate if it helps.
- 02
Bench review
Tech opens the unit, inspects pilot and spool, 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 Bekum valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page above.
What servo valve brands are used on Bekum machines?
Moog D661 and G761 servo valves come off Bekum machines routinely. Proportional valves from Bosch Rexroth and Parker also come through the bench.
Can you repair valves from legacy Bekum equipment?
Yes. Servo and proportional valves from all Bekum generations come through the bench, including discontinued Moog G761 and older Rexroth proportional families.
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.
Do you provide Bekum machine programming or software configuration?
No. NC Servo handles bench-level component repair on the valve hardware only. PLC programming, machine setup, and integration stay with the customer or OEM.
What if the valve is beyond economic repair?
If the valve is not fixable, 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.
More from NC Servo
Related repair coverage
Other injection-molding pages and the brand pages most-tied to Bekum hydraulics.
IMM hub
All injection molding builders we cover, plus shared hydraulics context.
Uniloy
Other extrusion blow molding equipment hydraulic coverage.
Moog brand page
Moog D661, G761, and broader Moog servo valve hardware.
Bosch Rexroth
Rexroth 4WRPH and proportional valve coverage.
Valve repair hub
Full directory of 20+ valve brands.
Repair vs replace
When component-level repair makes sense versus buying new or rebuilt.
Bekum valve down? Send a part number
Give us a call or send a part number with the machine 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.