Three-row roller slewing bearings have three raceways, one up and down and one radial raceway.
The up and down rollers can have same or different diameter depending on the loads.
The radial rollers are normally smaller. Each roller size can be accurately defined.
The rollers are kept in place by distance keepers.
Three-row roller slewing bearings can accommodate every load and have good loading capacity. They are especially suitable for heavy-duty machines which require large working radius, such as bucket-wheel excavators, wheeled cranes, ship cranes, ladle turret, heavy duty mobile cranes, etc.
Three-row roller slewing bearings can be divided into 3 types:
series 13 with external gear
series 13 with internal gear
series 13 without gear