Repair of Cylinders    We offer manufacturer and size independent repair of hydraulic and pneumatic work cylinders in our cylinder department. Spare parts can be manufactured in different material qualities and versions depending on design or individual case. A final function and leakage test is performed and recorded with every device. Certainly, we can conduct part services such as piston rod replacement and cylinder tube honing individually. Our range of services is round up by batch production according to design or drawing and additionally by the sale of accessories.

In Detail Types • round cylinder • tie-rod cylinder • servo cylinder • ganged cylinder • plunger cylinder • telescopic cylinder • pneumatic cylinder • block cylinder • rotary drive • rotary transmission • heavy load cylinder • gripper cylinder   Sealings • stripper • guide rings • O-rings • back up rings • rotary seals • piston seals • rod seals • shaft seals • moulded parts • seal material in polyurethan, PTFE, elastomere, polyamide, acetal resin, phenolic resin

Quality Standards   Welding Quality • MAG and WIG-welding • with test certificate if required   Piston Rod Quality • piston rod materials o Ck45 o Ck45 inductive- hardened o 20 Mn V6 o 20 Mn V6 Ni o 42 Cr Mo4 V o 42 Cr Mo4 V inductive- hardened • chrome layer thickness o diameter up to 17 mm min 10 µm o diameter up to 18mm min 20 µm • chrome layer hardness 63 to 68 HRC • surface roughness R a  max. 0.25 µm   Cylinder Tube Quality • cylinder tube materials o E355 + SR (St52 BK + S) o E355 (St52.0) • tolerance outside diameter o according to EN10305-1 for cold drawn tubes o according to EN10297-1/EN10220 for hot rolled tubes • tolerance inside diameter o according to ISO H8 to H11 • inside surface honed or rolled • roughness R a  max. 0.5 µm • straightness directed at 1:1000mm measured at the outside diameter

Cylinder accessories • pivot bearings • plain bearing bushing • joint and swivel heads • cylinder components o welding flange o tube plates o guide head o piston o trunnions o bearings

Special services   Pad Electroplating This process enables the repair of scores, impact marks or pores on the piston rod surface with the help of a partial repair coating. With this coating made of nickel, copper and cobalt, a wear-free surface is created. A surrounding temperature of min. 20° C is the only requirement for the application of this process.   Thermal Spray Coating This process can be used for recoating of worn parts as well as for new coatings. When used as new coating, it works as alternative to built-up chrome with a max. layer of 3 mm thickness. • max. outside diameter of 1m o at a max. length of 6m • inside diameter of 220 mm to 500 mm o at a max. length of 500 mm

Honing This process is used for the rework of worn seal running surfaces of cylinder tubes. The functionality of the seal running surface can be restored as alternative to the new fabrication of a cylinder tube. • diameter of 25 mm to 580 mm • length in handling to 4m   Repair Chroming With this process the piston rod surface is restored. For this, the surface is pre-ground down to damage depth and afterwards a new chrome layer with a maximum thickness of 500 µm is added by electroplating. Finally, this chrome layer is finished according to diameter tolerance and required surface roughness.