For the inspection of the distance between the engine cylinder block and the support shaft of the four column hydraulic press, during the production of the design scheme, the gap between the engine cylinder block and the rolling bearing shall be less than half of the gap of the internal spline shaft. If this value is exceeded, the gear shaft will be bent, which is caused by the vibration of the motor rotor port and the oil baffle, resulting in wedge gap, eccentric wear of the oil distribution pair, fatigue and damage of the rotating shaft The noise and vibration are large, so once the secondary clearance exceeds the standard, the engine cylinder block or supporting rolling bearing should be replaced.

The pre tightening force of torsion spring in the management center of four column hydraulic press has reached four standards.

First, the contact pressure between the engine cylinder block and the oil baffle, the sliding shoe and the swashplate is greater than or equal to a certain value to avoid steam leakage on the convex surface when the pump sucks in.

Second, it can make the plunger pump and sliding shoes reliable.

Third, when the pump is fully loaded, the torsion spring preload of the management center must get rid of the overturning torque caused by the centripetal force of the plunger pump on the engine block to avoid vibration of the engine block.

Fourth, the preload of the four column hydraulic press can avoid the deflection of the sliding shoe caused by the centripetal force of the sliding shoe, and ensure that there is no wedge-shaped gap at the bottom of the sliding shoe and no eccentric wear. After grinding the oil distribution pair and sliding shoe motion pair, the radial specification after assembly changes. At this time, properly add washers in the torsion spring seat according to the repair quantity and size, so as to ensure that the preload of the torsion spring in the management center will not change.