Hydraulic metering pump is a key component in the hydraulic system, its main role is to provide stable pressure and flow to the hydraulic system. However, in the process of use, the hydraulic metering pump will also have some failures, such as oil leakage, pressure instability, etc., these failures will affect the normal work of the hydraulic system, if serious, it will lead to equipment damage. Therefore, in daily use, it is necessary to correctly diagnose and eliminate the fault of the hydraulic metering pump. Next, this paper will introduce the troubleshooting methods in detail by citing several common hydraulic metering pump failures.

First, hydraulic metering pump oil leakage 

Hydraulic metering pump oil leakage is a more common failure, the main reasons for oil leakage are the following:

1. Aging or damage of seals

There are many seals inside the hydraulic metering pump, such as oil seals, O-rings, etc. These seals are easy to age or damage with the growth of use time or the poor working conditions of the hydraulic metering pump, resulting in oil leakage of the hydraulic metering pump.

2, pump shell wear or damage

The hydraulic metering pump housing is uneven or worn, which will also lead to a loose seal, resulting in oil leakage.

3. The pipe connection is loose or damaged

The loose thread at the connection of the hydraulic pipeline or the damage of the pipeline itself will also lead to oil leakage of the hydraulic metering pump.

Elimination method:

Start from the oil leakage point, check the possible causes of failure one by one, repair the problem or replace the parts.

Second, the pressure of the hydraulic metering pump is unstable

The pressure of the hydraulic metering pump is unstable, which may cause the equipment to work uneven or stop working, mainly for the following reasons:

1, the cleanliness of the oil is not enough

The oil is mixed with many impurities or foreign bodies, which will block the liquid path, resulting in unstable oil pressure inside the hydraulic metering pump, thus affecting the flow and pressure.

2. Internal components of the oil pump are damaged

Some components inside the hydraulic metering pump, such as valves, plungers, etc., are damaged, which will drift, loosen or seal poorly, thereby affecting the stability of the pressure.

3. Working environment factors

If the hydraulic oil temperature is too high, the ambient temperature is too low, it will also cause the pressure of the hydraulic metering pump to be unstable.