What situation will cause the manual hydraulic pump noise?

Manual hydraulic pump to your vast number of users has brought considerable convenience and functional effect, and is therefore accepted by everyone, of course, but also can not ignore its protection operation.
The manual hydraulic pump drive shaft is mainly driven by the diesel engine to rotate, and drive the cylinder block to rotate, the cylinder block in the plunger and cylinder block is a piece of rotation. The swash plate does not rotate, but swings from side to side about its center point. The left spherical portion of the plunger slides on the swash plate. As the top plunger moves down, the plunger travels axially from bottom dead center to top dead center. Although the device itself performs well, it has been found in practice that sometimes the product will appear application noise. So what causes it?
The analysis shows that the air entering the hydraulic system is the main cause of the noise produced by the manual hydraulic pump station. Another is mechanical vibration, if the tubing is long and thin, the elbow is not fixed, when the oil flow through, especially when the flow rate is high, it is easy to cause the pipe jitter, resulting in noise. Another is the instability of the relief valve, for example, due to the improper fit of the spool valve with the valve hole or the contact of the poppette valve with the valve seat is stuck by dirt, blocked damping hole, spring skew or failure so that the spool is stuck or unable to move in the valve hole, causing system pressure fluctuations and noise.
Manual hydraulic pump station belongs to a kind of mechanical equipment, which can be used in a variety of construction processes. Hydraulic hand pump is the same power transmission and adjustment assembly, you can use it to achieve mechanical energy - hydraulic energy - mechanical energy conversion, only for you to do a good job of its daily repair operation, only such can effectively improve its performance, as far as possible to make its exercise more extensive.