Each unit is opened, inspected, and rebuilt at the component level. Failed parts come from inventory or off donor units. Bench verification before ship.
N210
Pilot stage rebuild
Torque motor pilot stages, nozzle flapper, and pilot trim cleaned and aligned against documented procedures on Moog D661 / D662 valves.
N220
Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on the servo and proportional valve bodies that come off Uniloy machines.
N230
Coil & feedback work
Burned coil rebuild, feedback wire repair, and LVDT verification on closed-loop servo valve bodies.
N240
Bench testing
Hagenbusch and older-style hydraulic stands. Hysteresis, null shift, and step response data available for purchase.
N250
Donor parts service
Aftermarket and donor parts for legacy Uniloy valves on older platforms.
N260
Repair scope
Bench-level component work on the valve hardware. PLC programming, machine setup, and integration stay with the customer or OEM.
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.
N500 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.
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 pilot and spool, 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 components replaced from inventory or off donors, the valve verified under pressure, and shipped back.
N600 Common questions
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.
N700 More from NC Servo
Related repair coverage
Other blow-molding pages and the brand pages most-tied to Uniloy hydraulics.
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.
