Industrial Servo Hydraulics

What Industrial Servo Hydraulics does

Industrial Servo Hydraulics, Inc. (ISHI), founded in 1969 and headquartered in Fraser, Michigan, is the first independent electro-hydraulic servo valve repair house in the United States. The company specializes in repair, remanufacturing, and testing of servo valves, proportional valves, fatigue-rated actuators, hydraulic cylinders, pumps, motors, accumulators, and service manifolds, covering virtually all major OEMs including Moog, Pegasus, Atchley, MTS, Parker/Dyval, Bosch/Rexroth, Vickers, Star Hydraulics, General Electric, and Westinghouse. Its core technology rests on a proprietary servo lab (frequency response testing, LVDT calibration, flow plotting, spool grinding) and a component tooling facility anchored by a 150 HP bi-directional pump test stand, all calibrated to NIST standards. ISHI maintains extensive inventory of obsolete parts and remanufactured components that allow it to support equipment no longer covered by OEMs — a critical capability for aging power-plant and industrial assets.

The company operates a ship-to-repair distribution model: customers send hydraulic components to the Fraser facility for evaluation, repair to OEM specifications, documented testing, and return shipment with an 18-month workmanship warranty. Standard turnaround is 3-5 days, with same-day, 24-hour, and 48-hour breakdown services available for outage and emergency response. Beyond repair services, ISHI generates revenue from the sale of remanufactured valves and components, new parts distribution as the authorized U.S. representative for Star Hydraulics Ltd. and Control Enterprises Inc. (CEI), and a credit rebate program that encourages recurring service relationships. A proprietary R.A.N. (Release As Needed) inventory program holds customer-specific serviceable items in pre-tested condition for rapid release on demand. Pricing is quote-based with no inspection or disassembly fees on unrepaired returns.

ISHI serves at least eleven industrial verticals, with primary focus on power generation (Westinghouse and GE electro-hydraulic control rebuilds for steam and gas turbines), test and simulation (MTS, Instron/Schenck, Shore-Western fatigue-rated actuators and dynamometer servovalves), and government/military applications (naval bow thrusters, jet engine ground test controls, aircraft flight control). Secondary verticals include plastics, forging, automotive, railroad, die casting, lumber, EDM, and alternative energy (wind turbines). The company is privately held by three long-tenured co-owners — Karen M. Pauwels (President & Treasurer, 47 years), Daniel Jaroma (V.P. Production, since 1977), and Thomas C. Soboleski (V.P. R&D, since 1981) — with no outside funding, parent company, or institutional investors.

Name

Industrial Servo Hydraulics

Legal name

Industrial Servo Hydraulics, Inc.

Website

https://indservo.com

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

11–50 employees

Short description

Industrial Servo Hydraulics is a privately held, owner-operated electro-hydraulic servo valve and hydraulic component repair company founded in 1969 in Fraser, Michigan, serving power generation, test and simulation, defense, and industrial manufacturers globally via ship-to-repair, remanufactured parts, and authorized OEM distribution.

Ownership category

akta.pro rank

Product category

Hydraulic Repair Services

NAICS

Fluid Power Valve and Hose Fitting Manufacturing (332912), Fluid Power Pump and Motor Manufacturing (333996), Fluid Power Cylinder and Actuator Manufacturing (333995)

SIC

General Industrial Machinery & Equipment (3560), Pumps & Pumping Equipment (3561), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Proportional & Servo Hydraulics (Electrohydraulic Valves, Servo Systems) (IMAHAGAF)

akta.pro secondary industries

Hydraulic, Pneumatic & Fluid Power Systems MRO (Cylinders, Pumps, Valves, Hoses) (TLAKAHAI), Hydraulic Components (Pumps, Motors, Cylinders) (IMAHAGAA)

Keywords

• Hydraulic repair services
• Servo valve repair
• Electro-hydraulic components
• Hydraulic remanufacturing
• Industrial hydraulic services

Headquarters

HQ city

Fraser

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure

Revenue model

1. Hydraulic Component Repair Services: Core revenue from repair of servo valves, proportional valves, actuators, cylinders, pumps, motors, and accumulators. Repairs include complete disassembly, inspection, part replacement with OEM parts, testing to OEM specifications, and documentation. All repairs backed by 18-month workmanship warranty.
2. Remanufactured Parts Sales: Sale of remanufactured valves, actuators, and pumps. Stock includes thousands of model numbers from manufacturers like MOOG, Pegasus, Atchley, MTS, Parker, Bosch, Rexroth, Vickers, and others. Components can be built from parts inventory if not in stock.
3. New Parts Distribution: Distribution of new valves as authorized representative for Star Hydraulics Ltd. and Control Enterprises Inc. Provides direct replacement valves in form, fit, and function when remanufactured options are not available.
4. Credit Rebate Programs: Fixed percentage credits paid back to qualifying customers in the form of credit memos applied against future repair services. Encourages repeat business and customer loyalty.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels2 records

Core offering

Industrial Servo Hydraulics, Inc. (ISHI) is an independent hydraulic repair and remanufacturing company founded in 1969 that services servo valves, proportional valves, actuators, cylinders, pumps, motors, accumulators, and service manifolds for industrial customers. The company repairs components from virtually all major OEM manufacturers including Moog, Pegasus, Atchley, MTS, Parker, Bosch/Rexroth, Vickers, Star Hydraulics, General Electric, and Westinghouse, including obsolete models. It also distributes new electro-hydraulic valves as the authorized U.S. representative for Star Hydraulics Ltd. and Control Enterprises Inc.

Product overview

Industrial Servo Hydraulics, Inc. (ISHI) is a hydraulic repair and service company founded in 1969, operating as the oldest independent hydraulic repair facility in the United States. The company's core offering is its electro-hydraulic repair services, centered on servo valve and proportional valve repair and remanufacturing, supported by a broad inventory of new and remanufactured parts. ISHI's portfolio is organized around three main pillars: (1) repair and remanufacturing services for servo valves, fatigue-rated actuators, hydraulic cylinders, proportional valves, pumps, motors, accumulators, and service manifolds, covering virtually all major OEM manufacturers (Moog, Pegasus, Atchley, MTS, Parker/Dyval, Bosch/Rexroth, Vickers, Star Hydraulics, General Electric, Westinghouse, Abex, and others); (2) a proprietary inventory of remanufactured valves and components (Pegasus actuators, Rexroth pumps, Denison pumps), available for immediate delivery with core exchange options; and (3) distribution of new valves through exclusive partnerships with Star Hydraulics Ltd. (electromechanical servovalves) and Control Enterprises Inc. (CEI) (jet pipe servovalves, proportional valves, and actuators). ISHI serves a wide range of industries including power generation, test and simulation, plastics, lumber, die casting, forging, automotive, government/military, and railroad. All repairs are backed by an 18-month workmanship warranty and include documented performance testing. Supporting capabilities include a fully equipped servo lab (frequency response test stands, spool grinders, flow plots), a component tooling facility (150 HP pump test stand, cylinder/actuator test stands, honing/lapping), and a technical terminology resource. Turnaround options range from standard 3–5 days to same-day, 24-hour, and 48-hour breakdown services.

Differentiator

Problem solved

Functional benefit

Brands

• Star Hydraulics: Partner brand for electro hydraulic servovalves - ISHI is a stocking distributor and repair center for Star Hydraulics LTD.
• Control Enterprises

Products and services

• Hydraulic Servo Valve Repair Repair and remanufacturing of electro-hydraulic servo valves for all major manufacturers, including obsolete models, restored to OEM new specifications. Backed by an 18-month workmanship warranty with documented performance testing.
• Hydraulic Fatigue-Rated Actuator Repair Repair and remanufacturing of fatigue-rated actuators, including end cap remanufacturing and piston rod assembly services for MTS, Schenck Pegasus/Instron, DTE, and Shore Western assemblies.
• Hydraulic Cylinder Repair Remanufacturing of hydraulic cylinders from all industries, including power generation stop cylinders, with barrel honing or replacement, chrome plating, bushing replacement, and pressure testing.
• Hydraulic Proportional Valve Repair Complete checkout of on-board electronics, internal leakage testing, and lap requirement verification (overlap, underlap, or critical lap) for proportional valves, with dynamic and static testing.
• Hydraulic Pump and Motor Repair Repair of piston, vane, gear, and gerotor hydraulic motors and pumps from all major manufacturers, including obsolete models, with pressure testing and flow/pressure specification verification.
• Hydraulic Accumulator Repair Repair of piston and bladder-style accumulators, including bladder replacement, barrel honing, seal replacement, and leakage testing, backed by an 18-month warranty.
• Service Manifold Repair Inspection, disassembly, flushing, reassembly, and pressure testing of hydraulic service manifolds at 3000 PSI, including accumulator and filter servicing.
• Remanufactured Valves and Components Inventory Remanufactured servo valves, actuators, and pumps for manufacturers including Moog, Pegasus, Atchley, MTS, Parker/Dyval, Bosch, Rexroth, Vickers, Star Hydraulics, General Electric, and Westinghouse, with thousands of model numbers in inventory. Available for immediate delivery with core exchange options.
• New Electro-Hydraulic Servovalves (Star Hydraulics Ltd. and Control Enterprises Inc.) Distribution of new electro-hydraulic servovalves, proportional valves, rotary and linear hydrostatic controls, differential pressure controls, input controllers (joysticks), and mounting kits as the authorized U.S. representative for Star Hydraulics Ltd. and Control Enterprises Inc.

Quantifiable outcome

• Valves repaired perform better than factory new units with exact mechanical null positions and very good leakage levels
• +1 more outcomes

Named customers4 records

Segments11 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered core and minor.

• Star Hydraulics Ltd.coreChannel Partner/ Reseller/ DistributorIndustrial Servo Hydraulics is the authorized U.S. representative and stocking distributor for Star Hydraulics Ltd. valve series. Star Hydraulics chose ISHI to represent their electro-hydraulic servovalves due to their engineering background and confidence in ISHI's repair capabilities. ISHI has access to all valve specifications and provides dynamic and static testing for Star valves.
• Control Enterprises Inc. (CEI)coreChannel Partner/ Reseller/ DistributorISHI is an authorized distributor for Control Enterprises Inc. products including proportional valves, servo valves, rotary and linear hydrostatic controls, differential pressure controls, input controllers (joysticks), and mounting kits. ISHI has access to all valve specifications and uses only OEM parts in repairs.
• Referral Alliances (Test System OEMs and Service Providers)minorStrategic or Co-development PartnerISHI has created referral alliances with companies providing OEM test system components, system engineers, and troubleshooting service providers. These partnerships support the Test & Simulation industry customers by providing comprehensive solutions beyond ISHI's core repair services.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Parker Hannifin: Major hydraulic OEM whose valves, pumps, and cylinders ISHI repairs. Parker's broad industrial portfolio and authorized service network position it as a broad incumbent in the same fluid power space.
• Motion Industries: Industrial parts distributor with hydraulic repair and remanufacturing services across North America. Broader geographic footprint and digital procurement platform make it a scaled incumbent alternative to ISHI's direct sales model.
• Applied Industrial Technologies: Large industrial MRO distributor and service provider with broad hydraulic repair capabilities. Represents a scaled incumbent that competes for the same industrial customer maintenance budgets.
• Atlas Copco: Global industrial manufacturer and service provider with hydraulic and pneumatic service operations. Its broad industrial service network and scale make it a broad incumbent in industrial MRO adjacent to ISHI's specialties.
• Moog Inc. OEM of high-performance electro-hydraulic servo valves and motion control products. ISHI serves as an independent aftermarket repair channel for legacy Moog valves, but Moog itself is a much larger incumbent manufacturer in the same product category.
• Bosch Rexroth: Global hydraulic OEM and motion control manufacturer whose pumps, motors, valves, and cylinders ISHI services and remanufactures. Rexroth represents an incumbent OEM and authorized service network that competes with independent repair shops at scale.
• Eaton Corporation: Diversified industrial manufacturer with a substantial hydraulics business (Vickers, Aeroquip brands). A broad incumbent whose hydraulic valves, pumps, and motors are part of ISHI's installed-base repair catalog.

Direct peers

• Hydraquip: Independent hydraulic distributor and repair service provider serving industrial customers across multiple U.S. locations. Directly comparable to ISHI as a non-OEM hydraulic MRO specialist supporting pumps, valves, and cylinders.
• Flodyne-Hydradyne: Independent hydraulic distributor and repair service with multiple U.S. branches offering hydraulic component repair, remanufacturing, and field service. Closely comparable operating model to ISHI's repair-first hydraulic service business.

Others

• Stauff Corporation: Manufacturer and distributor of hydraulic accessories including hoses, tubing, clamps, and filtration. Adjacent supplier ecosystem participant whose products complement ISHI's service work on hydraulic systems.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

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Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Industrial Servo Hydraulics