Recommendations for easy mounting and dismounting

To facilitate mounting, the shaft ends and housing bores should have a 10 to 20 degree lead-in chamfer (fig. 1). This is particularly important for applications using larger bearings, as the rings may skew, causing damage to the mating surfaces.

To facilitate the use of withdrawal tools when removing bearings, it can be advantageous to:

  • provide recesses in the shaft shoulder (fig. 2)
  • provide recesses or threaded holes in the housing bore (fig. 3)
To dismount larger maintenance-free bearings with a bore diameter d ≥ 80 mm that have a tight shaft fit, SKF recommends using the oil injection method. With the oil injection method, oil under high pressure is injected between the bearing inner ring and its shaft seat to form an oil film. This oil film separates the mating surfaces, greatly reducing the force required to dismount the bearing and virtually eliminating any risk of damage to the bearing or shaft.
To use the oil injection method, there must be an oil supply duct in the shaft as well as an oil distribution groove in the seat (fig. 4). As a general rule, the distance between the groove and the bearing side face from which mounting and dismounting are to be performed should be approximately one third of the seat width (fig. 4). Recommended dimensions for the ducts and grooves as well as for the threads for the oil supply connection are provided in table 1 and table 2.
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