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1. Description
1.1 Principle of operation
Figure 1. Parts of the hydraulic nut
The hydraulic nut has proved to save considerable effort when mounting or dismounting
rolling bearings with tapered bores. It comprises two main components: a steel ring
(fig. 1a) with internal thread and a groove in one side face, and an annular piston (fig. 1b)
that rests in the groove. The seal (fig. 1c) between the two parts consists of two O-rings.
When oil is pumped into the pressure chamber (fig. 1d), the piston is pressed out with a
force that normally is sufficient for mounting and dismounting rolling bearings. The outer
ring is provided with an unthreaded hole (fig. 1g) to hold a dial indicator (fig. 1h). The
measuring tip of the indicator will rest against the shoulder of the piston to indicate axial
travel. (Note: The drive-up distance can be used to determine correct mounting; please
see skf.com/mount and/or CD ROM MP3600 for additional information.) Two threaded
holes are provided in the steel ring for attachment of the hose from the pump: one in the
side face (fig. 1e), and the other in the circumference (fig. 1f). The hole that is not in use
must be plugged with a ball plug, which is supplied with the nut. The hole used for the
hose connection should be fitted with a 729832 A nipple, included with the hydraulic nut.
A spare set of O-rings, a maintenance set, and a tommy bar for tightening the nut are all
included as standard accessories.
1.2 Load carrying capacity
SKF hydraulic nuts are designed to withstand the pressure normally encountered when
rolling bearings are mounted or dismounted.
SKF HMV / HMVC
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