SKF bearing skills: hydraulic nut

Source: China Bearing Network Time: 2014-07-07

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The hydraulic nut includes two primary parts; one is a ring with internal threads and has a groove on one side; the other is an annular piston and fits in the groove. The oil seal is made up of two O-rings. Composition; when the oil is pumped in; the piston is pushed outward; and the force is used to install and disassemble the bearing. Each nut has a joint for easy connection with the SKF bearing hydraulic pump; The oil viscosity should be about 300MM / S; the maximum allowable pressure is 100MPA.
When the piston acts; if the oil leaks from the hydraulic nut; it generally indicates that the oil seal is damaged and needs to be replaced. When replacing the oil seal; it is necessary to take out the piston ring first. Take out the piston ring; use the threaded pin to Three failures on the side of the ring push the piston ring out. SKF also supplies the oil seal. As for the old painted nut, there is no such screw hole; the piston ring can be lifted out with a screwdriver; replace the old O-ring.
After the device is disassembled; open the return valve of the pump and lock the nut; return the piston to the starting position; then the oil will flow back to the pump.

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