“Strategic Partner for Tunnellers”

E-Berk performs the revisions of TBMs and Cutter Heads that completed their projects and redesigned in accordance the geological conditions for new projects. Following a careful inspection, E-Berk furbishes up the machines and bring them back to like-new condition.

After E-Berk’s touch, your machines are now ready for new adventures…



Being a crucial factor in influencing the performance of full face Tunnel Boring Machine, the cutterhead design is one of the key factors of TBM.

The cutterhead needs to be designed according to geological conditions and construction requirements of tunnelling.Thus the cutter head design is a complex issue of engineering system design. It is of important strategic meaning to study the key technologies and improve independent innovation design capability, manufacturing and overhandling of the cutter head.

We redesign the cutter head opening ratio for the next project. If the cutter head is not good enough for revision, a new one is fabricated in E-Berk facilities. All welding operators are certified according to EN ISO 9606-1. Welding operations are performed according to AWS D1.1.



The Hydraulic Maintanence Team is capable of redesigning the system. All the sensors are checked by electricians which are directed by electrical and electronics engineers. The hydraulic system drawings are reviewed and redesigned if revisions are done on the system. Selected hydraulic system elements are very well-known companies products. Gearboxes are examined and the worn planet gears are replaced with the new ones which are manufactured in E-Berk Supply Chain.

All the hydraulic pistons are coated and grounded to the dimensions, cylinders are honed or replaced with the new ones. The assembly process is performed by the hydraulic experts who are directed by mechanical engineers. All the pistons are pressure tested before TBM assembly. The test procedures are followed for the performance testing of hydraulic systems which are torque and thrust movements of cutter head, and the segment erector functions. The pressure values measured are set to desired levels.


Wear and tear level of a TBM completed a tunnel are huge
and all the units of TBMs shall be examined, tested, repaired or
replaced for the next poject. Sometimes a broken cable in back up
facilities causes a long downtimes inside tunnel. E-Berk Team
knows that the quality and workmanship of each component is very
important for reliability of the machine. Acceptance testing of
overhauled TBMs covers all functions of gantries.