Independent third-party component-level repair of servo and proportional valves on HPM injection molding machines: Freedom, Hemipac, Toggle Press (TP), and Direct Clamp. Bosch Rexroth 4WRPEH / 4WRZ proportional valves and Moog Series 72 / 73 servo valves come through the bench.
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 72 / 73 series valves.
N220
Spool & sleeve service
Spool wear, contamination scoring, and lap restoration on heavy-duty HPM valve bodies.
N230
Coil & feedback work
Burned coil rebuild, feedback wire repair, and LVDT verification on closed-loop 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 HPM valves, including discontinued Moog 72 series bodies.
N260
Repair scope
Bench-level component work on the valve hardware. PLC programming, machine parameter setup, and integration stay with the customer.
Spool wear, contamination scoring, and lap-surface degradation on heavy-duty HPM valve bodies.
Pilot stage
Pilot null shift, nozzle plugging, and torque motor wear on Moog 72 / 73 series and D661 servo bodies.
Internal leakage
Worn seals and lap surfaces drive internal cross-port leakage on aged Rexroth and Moog bodies.
Coil & feedback drift
Burned coils after surge events, feedback wire wear, and LVDT signal drift on closed-loop bodies.
N500 Workflow
From part number to ship-back
Same four-step path through the shop whether the unit came off a Freedom or a Direct Clamp.
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 HPM valve repair
Application-specific questions. For brand-specific FAQs, see the dedicated brand page above.
What servo valve brands come off HPM machines?
HPM Freedom, Hemipac, TP, and Direct Clamp machines typically run Bosch Rexroth 4WRPEH and 4WRZ proportional valves alongside Moog Series 72 / 73 servo valves. All come off the bench for rebuild.
Can you repair valves from HPM Direct Clamp models?
Yes. Direct Clamp machines (500 to 4,000+ tons) run Moog servo valves and Rexroth proportional valves. Both come through the bench routinely.
What about Moog Series 72/73 servo valves on Hemipac?
Yes. Moog Series 72 and 73 servo valves on Hemipac and other later HPM platforms come through the bench. Spool, sleeve, pilot, and coil work all standard scope.
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 HPM 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 injection-molding pages and the brand pages most-tied to HPM 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.
