Hydraulic Nut HYDNUT155 Bearing Tool

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Working theory: 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 with internal thread and a groove in one side face, and an annular piston that rests in the groove. The seal between the two parts consists of two O-rings. When oil is pumped into the pressure chamber, 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 to hold a dial indicator. The measuring tip of the indicator will rest against the shoulder of the piston to indicate axial travel.

Operating instructions: to enable easy mounting, especially for larger nuts, it is important that the nut is properly centred on the mating thread before rotation. Large nuts must be supported during installation. When the bearing is mounted on a sleeve, make sure that the sleeve is straight, that is, with the thread aligned over the slotted part of the sleeve. It is recommended to always use a thread lubricant before applying the nut on the mating thread. To thread the nut onto the shaft or sleeve use the tommy bar provided. This is inserted in one of the four unthreaded holes in the outside cylindrical surface or in one of the two holes on the side surface. Nuts of size HMV(C) 94E and larger have the provision for two eye bolts (DIN 580) to be fitted. One or both of the eye bolts, when properly fitted, can be used to safely lift the nut. To facilitate the mounting of nuts of size HMV(C) 94E and larger, an arrow is marked on the nut circumference showing the position of the first thread. The nut should be carefully screwed onto a threaded section of the shaft or the sleeve until the nut abuts the bearing inner ring, the withdrawal sleeve, or a special support nut/plate. It is important that as much as possible, but not less than 80 %, of the thread of the hydraulic nut is engaged. If this is not possible, a help ring to support the nut is necessary. The piston should then be fully retracted into the nut. When dismounting rolling bearings from withdrawal or adapter sleeves, the hydraulic nut is screwed onto the sleeve thread until it rests against the bearing inner ring or a special support ring. By displacing the piston, the sleeve will be withdrawn from the bearing bore or the bearing will be pressed off the adapter sleeve.