Off Topic » Plunger pump variable

Failure of variable mechanism: the arc surface of variable head bearing bush is seriously worn; the control oil channel is blocked; the variable piston is stuck; the spring of control valve core is damaged; the variable mechanism leaks


Wear or burn out of the contact surface between the port plate and the cylinder body: the oil is dirty; there is no oil in the pump when starting; the hardness of the valve plate is not enough; the material of the cylinder block is poor; the high temperature and high pressure deformation of the port plate; the coaxiality between the support hole in the pump housing and the transmission shaft; the fit clearance between the cylinder block and the bearing is too large; the clearance at the knuckle joint of the transmission shaft is too small; the valve port surface of the cylinder block is not vertical to the rotating center; the transmission shaft is bent; the valve port plate is deformed Oil trapping is serious in the transition zone of high and low pressure.


Wear or burn out of the joint surface between slipper and swash plate: oil contamination; blockage of damping holes in plunger or slipper; insufficient hardness or machining accuracy of swash plate; inconsistent thickness of slipper shoulder; insufficient static pressure bearing accuracy of slipper surface; small plane of plunger ball head.

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