Hi, I would recommend you to have a look at the templates in the vehicle editor.
Adding the bucket to the excavator can be a bit difficult as you have to consider a lot of small details. The most important part is the collider because the game uses it as a trigger to know where the excavator digs.
I hope these tips help you.

Kind regards
Sebastian

Hi Sebastian,

thanks for your replay. You mean both mesh colliders (outsider and insider) ?

The stranger thing is that if I erase WbShovel2 from the tamplate of excavator (JB Bagger) and then I rebuild it with the same values I obtain this error (see below). Have you had the same problem? Thanks.

IndexOutOfRangeException: Array index is out of range.
at WbKDTree3D.findSplitPoint (UnityEngine.Vector3[] points, System.Int32[] inds, Int32 stIndex, Int32 enIndex, Int32 axis) [0x00000] in <filename unknown>:0

at WbKDTree3D.findPivotIndex (UnityEngine.Vector3[] points, System.Int32[] inds, Int32 stIndex, Int32 enIndex, Int32 axis) [0x00000] in <filename unknown>:0

at WbKDTree3D.makeFromPointsInner (Int32 depth, Int32 stIndex, Int32 enIndex, UnityEngine.Vector3[] points, System.Int32[] inds) [0x00000] in <filename unknown>:0

at WbKDTree3D.makeFromPoints (UnityEngine.Vector3[] points) [0x00000] in <filename unknown>:0

at WbShovel2.createKdTree () [0x00000] in <filename unknown>:0

at WbShovel2.initComponent () [0x00000] in <filename unknown>:0

at WbVehicleComponent.setupComponent () [0x00000] in <filename unknown>:0

at WbVehicle.initVehicle (.WbVehicleData vehicleData) [0x00000] in <filename unknown>:0

at WbVehicleManager.spawnVehicle (.WbVehicleData vehicleData, System.String vehicleGUID, Boolean newlyAddedVehicle, UnityEngine.Transform spawnPosition, Boolean startVehicle) [0x00000] in <filename unknown>:0

at WbLocationVehicleTrader.spawnVehicle (.WbVehicleData vehicleData) [0x00000] in <filename unknown>:0

at WbLocationSubMenuVehicleTrader.purchaseVehicle (System.Object data) [0x00000] in <filename unknown>:0

at WbUIConfirmWindow.onAccept (UnityEngine.GameObject go) [0x00000] in <filename unknown>:0

at (wrapper delegate-invoke) UIEventListener/VoidDelegate:invoke_void__this___GameObject (UnityEngine.GameObject)

at UIEventListener.OnClick () [0x00000] in <filename unknown>:0
UnityEngine.GameObject:SendMessage(String, Object, SendMessageOptions)
UICamera:Notify(GameObject, String, Object)
UICamera:ProcessRelease(Boolean, Single)
UICamera:ProcessTouch(Boolean, Boolean)
UICamera:ProcessMouse()
UICamera:Update()

I have forgotten that the game crashes too!