A slider for a track assembly of a machine is provided. The slider includes an elongated base portion coupled to a frame and a sliding portion extending from the elongated base portion. The sliding portion includes an outer surface configured to slidably engage with a track link of the track assembly. The sliding portion includes a set of wear indicators defined in the outer surface. The set of wear indicators includes a first wear indicator and a second wear indicator. The first and the second wear indicators are located at a first predefined thickness and a second predefined thickness respectively, measured along a central axis of the sliding portion. Further, the first wear indicator indicates partial wear of the sliding portion and the second wear indicator indicates substantial wear of the sliding portion.