Basa rema "track rollers" nderekuparadzira huremu hwe "excavator" pasi rose. Kana "excavator" ichishanda pasi risina kuenzana, kukanganiswa kwema "track rollers" kunonyanya kukosha. Saka, ma "track rollers" anopa rutsigiro rukuru. Uyezve, kana asina kunaka uye achiwanzova neguruva, anoda zvisimbiso zvakanaka kudzivirira ivhu, jecha nemvura kuti zvisakuvadze.