Pilot stage rebuild
Torque motor pilot stages, nozzle flapper, and pilot trim cleaned and aligned against documented procedures on Moog D661 / D662 valves.
Uniloy Servo Valve Repair
Independent third-party component-level repair of servo and proportional valves on Uniloy blow molding machines: UMS reciprocating screw, UCC shuttle, 350 / 500 accumulator head, and IBS injection blow. Moog D661 / D662, Parker D3F, and Rexroth proportional bodies come through the bench.
Where These Valves Sit
Four Uniloy machine contexts
Below are common Uniloy machine platforms and the valve brands that come off them.
01
UMS series (UMS 12, 16, 22)
Reciprocating screw extrusion blow molding. Rexroth or Parker proportional valves and Moog D661 servo bodies come off these for rebuild.
02
UCC series
Continuous extrusion shuttle machines. Moog D661 servo valves and Rexroth proportional valves come through routinely.
03
Uniloy 350 / 500 series
Accumulator head systems. Moog D662 servo valves, additional Moog servo bodies, and Rexroth proportional valves come off these.
04
IBS injection blow
Injection blow molding machines. Rexroth proportional valves come off these for rebuild.
What NC Servo Does
Component-level repair on Uniloy 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 servo and proportional valve bodies that come off Uniloy 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 Uniloy valves on older platforms.
Repair scope
Bench-level component work on the valve hardware. PLC programming, machine setup, and integration stay with the customer or OEM.
Brands
Uniloy servo valve brands
Top brands seen on Uniloy hydraulics. Click through for the dedicated brand page.
Common Faults
What usually shows up on Uniloy valves
Common failure modes seen on Uniloy valves at the bench.
| Spool wear & contamination | Worn servo valve spools and contaminated orifices on Moog D661 / D662 and Parker D3F bodies. Bench cleaning and lap restoration. |
|---|---|
| Pilot & null shift | Pilot-stage contamination and torque motor wear on Moog servo bodies. Drives null drift on closed-loop units. |
| Internal leakage | Worn lap surfaces and degraded seals drive internal cross-port leakage past the spool. |
| Coil & solenoid | Burned proportional coils and weakened solenoid windings on aged Rexroth and other proportional bodies. |
Workflow
From part number to ship-back
Same four-step path through the shop whether the unit came off a UMS reciprocating screw or a 350 accumulator head.
- 01
Get in touch
Call or email with the part number, machine model, 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 Uniloy valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page above.
What servo valve brands come off Uniloy machines?
Uniloy UMS, UCC, 350/500 series, and IBS platforms typically run Moog D661 / D662 servo valves, Parker D3F servo valves, and Rexroth proportional valves. All come off the bench for rebuild.
Can you repair valves on accumulator head machines?
Yes. Uniloy 350 / 500 accumulator head machines run Moog D662 servo valves and additional Moog servo bodies. Both come through the bench for full rebuild.
What about UCC continuous-extrusion shuttle machines?
Yes. UCC machines run Moog D661 servo valves and Rexroth proportional valves. The full set comes through the bench for rebuild.
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 Uniloy machine programming or software configuration?
No. NC Servo handles bench-level component repair on the valve hardware only. PLC programming, machine parameter 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 blow-molding pages and the brand pages most-tied to Uniloy hydraulics.
IMM hub
All injection molding builders we cover, plus shared hydraulics context.
Bekum
Other blow molding equipment hydraulic coverage.
Moog brand page
Moog D661, D662, and broader Moog servo valve hardware.
Parker brand page
Parker D3F servo and proportional valve coverage.
Bosch Rexroth
Rexroth proportional valve coverage on clamp and shuttle hydraulics.
Valve repair hub
Full directory of 20+ valve brands.
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.
Uniloy valve down? Send a part number
Give us a call or send a part number with the machine model 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.