Sandvik 152 523 08 Bushing

The bushing, part 152 523 08, depends on a thin film of grease or oil between its bore and the shaft to keep metal from touching metal, so how it ages is mostly a story about lubrication. Grit that gets into that film does not simply pass through; it embeds in the softer bushing surface and then laps the harder shaft like a file, which is why a bushing that looks fine on the outside can still be scoring the part it supports.

When this bushing is changed, the bore should be inspected for fine circumferential scoring and the shaft journal felt for a ridge, because a new bushing run against a grooved shaft will wear quickly and carry the old damage forward. Any grease passage or groove in the bushing should be clear and lined up with the supply point before it is pressed home. Fitting it with clean hands and clean grease costs nothing and is often what separates a bushing that lasts a full service interval from one that does not. Stalroc quotes this Sandvik reference by part number and exports worldwide to mining, quarrying, and drilling contractors.