Schaeffler North America


Product catalogue with selection and information system

Hydraulic tools

FAG Mounting Manager

Mounting instructions for rolling bearings with tapered bore

FAG Mounting Manager


Technical Product Information | 2017-11
Hydraulic Nut HYDNUT


Technical Product Information | 2010-06
FAG Pressure Generation Devices

Mounting and Dismounting

Hydraulic tools

Hydraulic tools can be used to apply large forces. These tools are therefore particularly suitable for the mounting and dismounting of large bearings or parts with a tapered bore. Hydraulic nuts are used as a mounting tool. Pressure can be generated using oil injectors, hand pumps or hydraulic units.

Mounting methods
Bearings with a tapered bore are mounted either directly on the tapered shaft or journal or by means of an adapter sleeve or withdrawal sleeve on the cylindrical shaft. The internal clearance is set either by measurement of the axial drive-up distance or by conventional means using feeler gauges.

Measurement of the axial drive-up distance
The bearing is placed in its start position on the tapered bearing seat using a hydraulic nut. The start pressure, which is defined for each bearing, is checked using a digital manometer on the hand pump PUMP1000-4L-CONTROL. A certain quantity of oil is required in order to reach the specified drive-up distance. This is achieved by using a defined number of strokes. The number of strokes can be read off from the stroke counter on this hand pump.

The advantages of this mounting method are as follows:

  • simplified mounting
  • very high security and accuracy
  • correct mounting of sealed bearings.

Measurement of the reduction in radial internal clearance
When the bearing is driven onto the tapered seat, the inner ring is expanded and the radial internal clearance is thereby reduced. This reduction in radial internal clearance is an indication of the tight fit of the bearing. Measurement is carried out using a feeler gauge.


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