The track roller, na-akpọ ala ala ma ọ bụ ala ala bụ ihe dị mkpa undercarriage akụkụ maka crawler excavators ma ọ bụ bulldozers. Ha na-enwe mmekọrịta chiri anya na ala na-eje ije, ya mere ogo nke igwe egwu nwere mmetụta dị ukwuu na arụmọrụ nke akụrụngwa ahụ.
