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Engines encompass drive units of various designs for stationary, mobile and industrial applications. Key areas include diesel engines used to power generators, ships, locomotives and industrial machinery, as well as gas engines for combined heat and power (CHP) plants and natural gas-powered drives.
Industrial electric motors (induction, synchronous and servo motors) form the backbone of industrial drives. Hydraulic motors perform drive tasks in the hydraulic systems of construction and agricultural machinery. Marine engines for commercial and recreational boating complete the range.
Leading manufacturers include Caterpillar, Cummins, MTU, Deutz, MAN, Perkins, Yanmar, Kubota, Volvo Penta and, in the electric motor sector, Siemens, ABB, SEW-Eurodrive and Lenze.
Motors are used in power generation (generator sets), in shipping, construction machinery, agricultural machinery, industrial plants, combined heat and power (CHP) units, and in decentralised energy supply.
Frequently asked questions about second-hand engines
What types of motors are available in this category?
These include electric motors (induction/three-phase, servo and DC motors), gear motors, industrial and drive motors, as well as internal combustion and stationary engines, such as those used in power generators. Key factors for selection include power, speed, design, voltage/frequency and the required protection class, along with the intended application.
Which nameplate details do I need to check on a second-hand electric motor?
Key factors include rated power (kW), speed, voltage and connection (star/delta), frequency, rated current, design (e.g. IEC size, B3/B5), as well as the protection class (IP) and thermal class. You should also pay attention to the efficiency class (IE), as this affects operating costs and, in some cases, marketability, as well as the shaft and flange dimensions for mounting.
How can I assess the condition of a second-hand electric motor?
Key indicators include the condition of the bearings (smooth, quiet running without vibration), the insulation resistance of the windings, and clean, undamaged windings with no discolouration or smell of burnt varnish. A test run at no load and an insulation resistance test provide good indications; discoloured windings or increased bearing noise suggest previous damage.
How important is the efficiency class (IE) when buying second-hand?
The efficiency class has a significant impact on energy costs over the motor’s lifetime, as motors often run continuously. In the EU, minimum efficiency requirements under the Ecodesign Regulation apply to the placing on the market of certain motors. Older, lower-efficiency motors may be cheap to buy, but can be more expensive to run and may face restrictions on resale.
What should I look out for specifically with servo and gear motors?
With servo motors, the encoder/resolver, brake and compatibility with your controller and control system are crucial, as a suitable drive system is often more important than the motor itself. For gear motors, the key factors are the gear ratio, output torque, gearbox design, oil condition and seal integrity; leaks at the shaft seal or gearbox noise are warning signs.
How important are the operating mode and load history?
Very relevant, as a motor that has undergone numerous starts, frequent switching or operation with a variable frequency drive without suitable bearings or insulation may be more worn than its actual running time would suggest. Ask about the operating environment (dust, humidity, temperature), operating mode (S1 continuous operation vs. intermittent operation) and whether the motor was run via a frequency converter.
What tests and safety aspects need to be taken into account?
For electrical safety, CE conformity and the periodic inspection of electrical equipment are essential; it is advisable to carry out insulation resistance and, where applicable, winding resistance measurements, as well as a documented test run. For use in potentially explosive atmospheres, a valid Ex marking (ATEX) is mandatory and must not be compromised by repairs.
What should be taken into account during transport, connection and commissioning?
Larger motors are heavy and have a critical centre of gravity, which is why lifting points and transport securing must be used; shafts and bearings should be protected against impact. Before commissioning, it is recommended to carry out insulation testing, check the direction of rotation, ensure correct terminal connections and ensure a clean, properly aligned installation, as misalignment significantly reduces bearing life.
What are the typical sources of error that lead to incorrect purchases?
Common pitfalls include a motor that has previously been overheated or rewound, with unclear quality of the repair work; an unsuitable design or shaft dimensions; a lack of compatibility with frequency converters; and an efficiency or protection class that is too low for your application. An insulation test and a brief test run before purchase will clarify the key points.
How do I find the right motor on machinery-market.eu?
Use the filters for manufacturer, year of manufacture, condition and technical specifications to narrow down the selection by power, speed, design and voltage. As each listing specifies the year of manufacture, condition, location and technical data, you can check the nameplate details and mounting dimensions before making contact.
How do I complete the purchase with the seller?
You contact the seller directly via the contact function in the listing, without any intermediaries, request test reports and arrange a test run, as well as agreeing on the price, payment and transport. Verified sellers are marked on the platform; the actual purchase transaction takes place outside the platform.
Are there financing options for engines and drive units?
For larger drive packages, you can submit a non-binding hire-purchase or leasing enquiry via the listing; you clarify the terms with the seller or the finance partner. As machinery-market.eu is purely a marketplace, payment is not processed via the platform.