Repair & Reconditioning: Hydraulic Manifolds and Valves
Repair & Reconditioning: Hydraulic Manifolds and Valves
We recondition hydraulic control manifolds, directional control valves, pressure relief valves, pressure reducing valves and check valves from world-leading brands. Comprehensive diagnostics, repair and performance testing on proprietary test benches.
Hydraulic Assemblies We Service
Assembly
Scope of Repair
- Hydraulic Control Manifolds (HICs / Valve Blocks)
Multi-functional monolithic blocks with internal flow routing channels. Overhaul includes complete teardown, diagnostic inspection, gallery flushing, cavity line boring and replacement of worn parts.
- Directional Control Valves (Spool & Poppet Types)
Geometric restoration of spools, precision match-lapping, seal kit replacement and valve housing reconditioning.
- Pressure Relief & Reducing Valves
Reconditioning of poppets and seats (precision lapping, coordinate boring), spring replacement, leakage elimination and cracking/operating pressure setting.
- Check Valves & Pilot-Operated Check Valves (Counterbalance Valves)
Seat reconditioning, replacement of shut-off balls, poppets, pilot plungers and return springs.
- Pressure, Flow, and Directional Control Valving
Comprehensive diagnostics, flow calibration, and repair of all hydraulic control hardware configurations.
What Does Hydraulic Valve and Manifold Repair Include?
01
Diagnostics and Defect Analysis
- Visual incoming inspection and degreasing of the assembly.
- Inspection of housing geometry, port threading, and internal passage integrity.
- Clearance gap measurement in spool-to-bore assemblies.
- For hydraulic manifolds: vacuum decay testing of valve cavities and internal galleries to verify wall integrity.
- Solenoid actuator diagnostics: coil resistance measurement, pull-force verification, and response time testing.
- Issuance of a formal inspection report (defect schedule) with repair recommendations.
02
Disassembly and Decontamination
- Complete teardown of the manifold block, removing solenoid coils, cartridge valves, plugs, and subplates.
- Ultrasonic or high-pressure jet cleaning of all components to remove oxidized oil varnish, particulate contamination, and resinous sludge.
- Chemical flushing of internal galleries using specialized flushing formulations.
- Compressed dry air blowdown.
03
Reconditioning of Manifold Blocks and Housings
- Line boring of worn cavities for oversize repair spools/cartridges (coordinate boring up to Ø 250 mm, depth up to 750 mm, working table coordinates 500 × 315 mm).
- CNC turning and milling of precision bushings, sleeves, and pilot plungers.
- Thread reconditioning and thread chasing in block ports.
- Flat surface precision grinding and lapping of subplate mating interfaces.
- Reconditioning of seating cavities for screw-in cartridge valves (SICV) and slip-in logic elements.
04
Reconditioning of Valves and Spools
- Cylindrical grinding of spools and geometric profile restoration (grinding lengths up to 2,000 mm).
- Weld overlay (cladding) on worn surfaces in cases of deep scoring or severe abrasive wear.
- Precision match-fitting and honing of new spool/plunger assemblies in cases of critical clearance wear.
- If custom or complex parts are required, capabilities from the Non-Standard Equipment division are utilized.
05
Diagnostics and Repair of Solenoids & Electronics
- Solenoid coil replacement and electrical contact restoration.
- Bench testing, stroke actuation check, and pull-force calibration.
- Complete replacement of defective electronic amplifiers and coils as required.
06
Component Replacement
- Solenoid actuators (genuine OEM or verified high-grade equivalents).
- Precision seal packages (O-rings, backup rings, chevron sets, dynamic seals).
- Intermediate and subplate separator plates (in case of cavitation pitting or warpage).
- Calibrated springs (in cases of fatigue or loss of spring rate).
- Sealing balls, poppets, needles, and spools.
07
Assembly and Calibration
- Clean-room component assembly with verified tightening torques and precise spool orientation.
- Pressure setting and calibration of relief, reducing, and sequence valves.
08
Test Bench Validation
- Hydrostatic proof testing for external and internal tightness across all galleries and ports.
- Full dynamic testing under operating pressure (up to 50 MPa / 500 bar).
- Evaluation of flow-pressure drop characteristics ($\Delta P$) and cross-port bypass leakage.
- Issuance of an official equipment technical passport recording actual test performance.
Advantages of Repair at Promgidropryvod
01
In-House Precision Reconditioning Fleet
Cavity coordinate boring, spool manufacturing, and cylindrical grinding are all conducted in-house on our own CNC machinery. This enables full remanufacturing of complex imported manifolds without costly block replacement.
02
Specialization in Complex Fluid Power Circuits
Extensive engineering experience servicing multi-valve monolithic manifolds, proportional hydraulics, and complex directional valve circuitry.
03
Dedicated Test Benches
Every overhauled manifold and valve undergoes static and dynamic pressure testing, certified by an official test protocol.
04
Authorized Bosch Rexroth Service
Utilization of genuine spare parts, OEM manufacturing tolerances, and direct access to factory technical documentation.
The Repair Workflow at Promgidropryvod
01
Receiving & Initial Diagnostics
Visual inspection, baseline parameter verification on the test bench (where feasible), and defect logging.
02
Defect Schedule & Teardown
- Dismantling valves, solenoids, and seals
- Thorough cleaning and vacuum decay testing of manifold galleries
- Formal inspection report generation
03
Quotation & Approval
Customer reviews and approves the agreed scope of work, replaced parts list, and commercial quotation.
04
Reconditioning & Machining
- Ultrasonic bath decontamination
- Cavity line boring
- Spool match-grinding
- Seat lapping
- Replacement of coils/seals
05
Assembly & Setting
Torque-controlled reassembly in strict compliance with technical specifications, followed by hydraulic pressure calibration.
06
Bench Testing & Certification
Full-pressure proof testing, internal cross-port leakage measurement, and technical passport signoff.
Completed Case Studies
Repaired Using Genuine Components
Our status as an official service partner gives us direct access to genuine Bosch Rexroth spare parts and technical documentation, guaranteeing factory-level repair quality.
Official service partner. Supply of genuine solenoids, valve cartridges, seals, and rebuild kits.
Test bench hydraulic fluid filtration maintaining target fluid cleanliness classes (ISO 4406 / NAS 1638).
Industrial filter elements for test benches and flushing equipment.
Frequently Asked Questions
How do I know if a hydraulic manifold or valve needs repair?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
How quickly do you repair hydraulic valves and manifolds?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
What can be done if the internal channels or cavities of a manifold are worn?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
Do you use genuine OEM spare parts?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
What warranty is provided on repaired manifolds and valves?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
Do you perform in-house machining of custom components for valve repairs?
Key symptoms include external fluid leaks, system pressure loss or instability, fluid overheating, sluggish or jerky cylinder/motor movement, abnormal hydraulic whining/noise, and spool jamming in end positions. Definitive failure causes are identified during instrumental test bench diagnostics.
Request Manifold or Valve Repair Now
Attach a photo of the assembly, an image of the nameplate (data plate), a hydraulic schematic, or describe the malfunction. Our engineer will contact you promptly to clarify details and calculate the repair estimate.