In the process of bolt fastening installation and construction in petrochemical industry, the working environment is relatively poor; Large number of bolts and large amount of use; The torque value is required to be large, and the wrench is overloaded for a long time. Therefore, how to correctly use the hydraulic wrench, prolong the service life of the hydraulic wrench, safe and efficient construction is very important.

1、 Before work, check whether the screw on the hydraulic wrench is loose, and turn the wrench to observe whether its function is good. Check whether the oil tank of the hydraulic pump is full of hydraulic oil, whether the oil pipe is cracked, whether the quick connector is connected in place and whether the locking ring is installed.

2、 Place the wrench in the open space. Start the hydraulic pump and check whether the oil pump operates normally. Press and hold the wire control switch, the square shaft or ratchet of the wrench starts to rotate, the wrench stops rotating when it is in place, and the pressure gauge rises rapidly from "0" to the set pressure; Loosen the button and the wrench will automatically return. Repeat several times to make the wrench idle for several times. Observe the rotation of the wrench to determine the operation direction of locking and loosening. If there is no abnormality, place the square shaft or ratchet on the sleeve.

3、 For pressure adjustment, press the button on the wire control switch with one hand. At this time, the square shaft or ratchet rotates, the wrench stops rotating in place, the pressure gauge rises rapidly from "0", and the pressure regulating valve of the oil pump is adjusted with the other hand to adjust the pressure required by the pointer in the pressure gauge.

Adjust the pressure of the pump station to the maximum, confirm that the wrench turns to the loosening direction, put the wrench on the sleeve, find the reaction fulcrum, stay stable, and repeat the action until the nut is removed. Determine the locking direction, adjust the output pressure of the pump according to the torque value, install the square shaft or ratchet on the sleeve, and operate according to the operation mode during the test run until the nut no longer rotates.