Service & Repair
Services
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DEMZ conducts technical tracking of supplied equipment and provides warranty and post-warranty maintenance, which is an integral part of our operations.
We offer cooperation by providing full service maintenance for lifting and material handling equipment. Service support includes issuing a service certificate (equipment registration and warranty obligations) and restoring technical documentation (if necessary).
We respond quickly and flexibly to the needs and requirements of our Customers. Our company accommodates all Customer preferences regarding budget, location, and repair timelines. Repairs are performed using certified equipment by qualified specialists in a dedicated workshop, strictly adhering to repair regulations and technical specifications. Replacement of components and assemblies can also be carried out on-site at your facility.
DEMZ performs the following types of work:
- dismantling, installation, and commissioning of lifting equipment;
- equipment transportation with customized loading plan development;
- technical support for supplied equipment during and after the warranty period;
- routine repairs and major overhauls of lifting electromagnets, grabs, shears, all types of electric motors, as well as industrial hydraulic and electrical equipment.
DEMZ additional services for electromagnets and grabs:
- on-site “UVV” testing (emergency and preventive);
- 24/7 technical support for supplied equipment and services;
- rental;
- leasing;
- factoring;
- supply of spare parts and original components throughout the entire service life;
- “TRADE-IN” exchange of old or failed equipment for new units (we exchange four old or defective units for a NEW one with identical specifications);
- sale of refurbished pre-owned equipment after major overhaul.
In the mining and metallurgical sector (MMC), the most in-demand repairs among attachments are major overhauls of electric lifting magnets operating under heavy-duty conditions. We have accumulated extensive experience in repairing magnets previously produced in the USSR (M and PM types by Dynamo, Elektro-Tatmagnet, LMZ Parkhomenko), Bulgaria (M type by Iskra), and the GDR (LA type by Elektromotorenwerk Dessau), as well as units supplied to Ukrainian enterprises since the 1990s from German manufacturers WOKO and ADOBA, and Italian GAUSS MAGNETI.
Scrap handling magnets are typically subjected to high mechanical stress, especially when operating in a three-shift rotation. To reduce wear on the magnetic poles, we offer hardfacing as an optional feature, where an extremely hard protective layer is welded over the entire pole surface. This wear-resistant coating—especially during rough cleanup or sweeping operations where unprotected poles deteriorate rapidly—saves costs and eliminates downtime caused by magnet repairs.
Electrical connection of the magnet is carried out via a standard stationary terminal box mounted behind a heavy-duty protective plate. Alternatively, upon request, we offer a version with a heavy-duty plug connector.
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Hydraulic grabs are widely used in scrap recycling yards, where equipment failures are fairly common. We have mastered routine repairs and major overhauls of hydraulic attachments manufactured by FUCHS, SMAG, ATLAS, CATERPILLAR, LIEBHERR, PAKKARAKENNE, SENNEBOGEN, and others.
Grab malfunctions are typically caused by natural wear and tear on components and parts (shell/tine cutting edges, grab axles, guide rollers, segment teeth, pins, etc.), as well as tie rod misalignments, cracks and bends in blades, and cracks in the weld seams of the shells and rope basket housing. Additionally, wire rope sheaves in both the upper and lower baskets must operate smoothly without jamming.
Factory-level reconditioning allows hydraulic grabs to significantly extend their operational service life. Restoration work relies on proprietary hydraulic equipment manufacturing technology, Ukrainian Technical Specifications (TU U), modern materials, and well-established cooperation with leading global brands.
Consultation
We supply power supply systems and components for lifting magnets designed for FUCHS, ATLAS, CATERPILLAR, LIEBHERR, PAKKARAKENNE, and SENNEBOGEN excavators and hydraulic material handlers. Magnet power supply systems are equipped with specialized synchronous generators rated at 13, 20, and 30 kW. Featuring a compact, maintenance-free design, the system is driven either by the excavator’s diesel engine or by its hydraulic system. System selection is based on the material handler configuration and the power rating of the existing or required lifting electromagnet (see table).
Table. Specifications of Special Synchronous Generators
| Model / Rated Power, kW | 13 | 20 | 30 |
| Nominal Voltage, V | 230 | ||
| Output Current Type | DC | ||
| Max. Current, A | 57 | 87 | 130 |
| Operating Speed, rpm | 2700…3400 | ||
| Cooling | integrated fan, natural | ||
| Duty Cycle, % | 50…100 | ||
| Ingress Protection (GOST 14254), IP | 55 | ||
| Insulation Class (GOST 8865) | H | ||
| Ambient Temperature, 0C | -25…+50 | ||
| Altitude Above Sea Level, ≤ m | 1000 | ||
| Climate Category (GOST 15150) | U1 | ||
| Weight, kg | 58 | 87 | 135 |
Consultation
DEMZ has extensive experience performing major overhauls of vibrating screens from international manufacturers such as Kleemann, Terex, Metso, Nordberg, Sandvik, and others. Services include replacing worn parts, manufacturing equivalent assemblies, and supplying screening media, among other solutions.
DEMZ carries out major overhauls of AC and DC electric motors for both general industrial and crane-duty applications. Motor series received for repair from industrial facilities and ports include MTF, MTH, ARRK 314-8, SPH, SMH, MTM, SH, KG, and others.
DEMZ performs all types of repairs for domestic and imported welding rectifiers and transformers.
Equipment restoration works comply with Technical Specifications TU U 33.1-20215091-004, TU U 33.1-13425008-001 / 002, Permit No. 12.3-01.2-07-0043.16, DBN D.2.8-204.01.06-2005 “Repair of AC and DC Electrical Machines”, DSNiP 3.3.6.096-2002 “State Sanitary Norms and Rules for Working with Sources of Electromagnetic Fields”, DSTU EN 60204-1:2015 “Safety of Machinery — Electrical Equipment of Machines”, GOST 17752-81 “Positive Displacement Hydraulic Drives and Pneumatic Drives”, and EN 983:1996 “Safety of Machinery — Safety Requirements for Fluid Power Systems and Their Components — Pneumatics”.
DEMZ service center specialists possess extensive industrial experience. In our operations, we are guided by principles of transparency and integrity, serving clients without geographical limitations. We are always ready for productive collaboration with those facing real operational challenges and seeking effective solutions.
We look forward to receiving your inquiries and guarantee prompt, professional attention to all your requirements.
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Frequently Asked Questions (FAQ)
The lifting capacity of an electromagnet is the maximum load weight permitted to be lifted and moved by the magnet. It typically equals 0.5 of the breakaway (tear-off) force, providing a safety factor for secure operation.
The lifting capacity depends on the magnitude of the magnetic flux in the core. The flux increases as the magnetomotive force increases and as the magnetic reluctance of the circuit decreases.
Copper coils cost twice as much as aluminum ones; copper has 1.7 times higher conductivity than aluminum; copper density is 3.3 times higher than aluminum; copper’s specific heat capacity is 3 times lower than aluminum’s; copper coils offer more repair cycles and a longer service life than aluminum.
Welded steel housings are simple and cost-effective to produce. The advantages of a cast magnetic core over a welded one include cooling fins, greater operational durability, solid structural integrity, and the complete absence of internal air gaps.
Overheating, lower density of scrap metal, switching to metal stock with larger air gaps, and malfunctions in the control cabinet (voltage converter).
Improper operation (faulty control cabinet, overheating, moisture exposure, overvoltage), coil-to-housing breakdown (ground fault), open-circuit/broken conductors, and inter-turn short circuits within the coil.