- Advanced Machining - Company RoW
- Repair and Maintenance - All companies
- Mounting - All companies
- Welding - RoW, GMK Mechanical
- Surface treatment (painting and sandblasting) - Company GMKAB
- Wear protection (ceramic, rubber, polyurethane, wear plate) - Company GMKAB
- Metallizing - Company GMKAB
- Pump Service Maintenance - Company GMKAB
- Construction Equipment, Buckets Service, manufacturing - Company GMK Mechanical
