Method for manufacturing at least one part of a mechanically or hydraulically operated tiltrotator or rotator for an arm of an earth-moving or material-handling machine, such as an excavator, tractor, harvester, forwarder or crane, whereby the tiltrotator or rotator is arranged to hold a tool, such as a bucket, grapple, fork, vibratory compactor or harvesting head, and providing said at least one part of said tiltrotator or rotator with a wear resistant surface, whereby said method comprises the steps of: a) forming a melt comprising unalloyed or alloyed ductile iron, b) casting at least one part of a tiltrotator or rotator from said melt, c) allowing said at least one part of the tiltrotator or rotator to cool, d) austenitizing said at least one part of the tiltrotator or rotator, e) quenching said at least one part of the tiltrotator or rotator, f) austempering said at least one part of the tiltrotator or rotator, and g) allowing said at least one part of the tiltrotator or rotator to cool, • shaping at least one surface on said at least one part of the tiltrotator or rotator during the casting process or during subsequent machining before ADI treatment, and • mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, characterized in that the step of providing said at least one part of the tiltrotator or rotator with said wear resistant surface is carried out after said step of mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, whereby the surface material of said at least one part undergoes a transformation to martensite when said at least one part of the tiltrotator or rotator is subjected to a high contact force during use, thus forming and subsequently regenerating said wear resistant surface, whereby no extra process step to provide said at least one part of the tiltrotator or rotator with a wear-resistant surface is therefore necessary after said at least one part of the tiltrotator or rotator has been cast and austempered and before said device is mounted on said arm of an earth moving or material-handling machine. a) forming a melt comprising unalloyed or alloyed ductile iron, b) casting at least one part of a tiltrotator or rotator from said melt, c) allowing said at least one part of the tiltrotator or rotator to cool, d) austenitizing said at least one part of the tiltrotator or rotator, e) quenching said at least one part of the tiltrotator or rotator, f) austempering said at least one part of the tiltrotator or rotator, and g) allowing said at least one part of the tiltrotator or rotator to cool, • shaping at least one surface on said at least one part of the tiltrotator or rotator during the casting process or during subsequent machining before ADI treatment, and • mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, characterized in that the step of providing said at least one part of the tiltrotator or rotator with said wear resistant surface is carried out after said step of mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, whereby the surface material of said at least one part undergoes a transformation to martensite when said at least one part of the tiltrotator or rotator is subjected to a high contact force during use, thus forming and subsequently regenerating said wear resistant surface, whereby no extra process step to provide said at least one part of the tiltrotator or rotator with a wear-resistant surface is therefore necessary after said at least one part of the tiltrotator or rotator has been cast and austempered and before said device is mounted on said arm of an earth moving or material-handling machine. • shaping at least one surface on said at least one part of the tiltrotator or rotator during the casting process or during subsequent machining before ADI treatment, and • mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, characterized in that the step of providing said at least one part of the tiltrotator or rotator with said wear resistant surface is carried out after said step of mounting said tiltrotator or rotator on said arm of an earth moving or material-handling machine, whereby the surface material of said at least one part undergoes a transformation to martensite when said at least one part of the tiltrotator or rotator is subjected to a high contact force during use, thus forming and subsequently regenerating said wear resistant surface, whereby no extra process step to provide said at least one part of the tiltrotator or rotator with a wear-resistant surface is therefore necessary after said at least one part of the tiltrotator or rotator has been cast and austempered and before said device is mounted on said arm of an earth moving or material-handling machine.