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Eliminate these 10 kinds of hidden dangers and ensure the stable use of hydraulic pump

Update:10-09-2020
Summary:

If the hydraulic oil pump fails, it will affect the wor […]

If the hydraulic oil pump fails, it will affect the work of the whole system. Today, we will introduce 10 causes of hydraulic pump failure.
Coupling installation error
Because the fit clearance between coupling and shaft is too small or no clearance, the bearing will be injured when it is knocked hard, which will lead to early damage of the bearing and affect the life of the whole pump core.
Coaxiality out of tolerance
If the concentricity exceeds the specified value during installation, the bearing and the whole pump core will be eccentric and early damaged, and the shaft will also be cut off (the shaft is cut off at the thickest place of the shaft head), and the coaxiality is generally controlled to be less than or equal to 0.1 mm.
The oil is too dirty
Because the oil tank is not sealed, the surrounding dust and debris mixed into the oil, resulting in the cleanliness of the oil exceeding the standard. If the filter accuracy is not enough or there is no filter, the pump core will be quickly scratched and damaged.
The oil temperature is too high
Since there is no cooling device, the oil temperature will increase continuously during the continuous use of the machine. If the oil temperature is higher than 70 ° for a long time, the service life of the oil pump will be greatly shortened, and it will be damaged in half a year to one year.
Oil metamorphism
Due to the use of expired hydraulic oil or regenerated oil, the surface of pump core parts is black or sticky. The impurities, poisons and corrosivity in the oil can cause early damage to the oil pump.
Water in oil
In the water cooling device, due to poor sealing, water enters into the oil, and the oil is milky white. The metal parts inside the oil pump will rust or locally rust, and the pump will accelerate wear and shorten its service life in high-speed rotation.
If the hydraulic oil pump fails, it will affect the work of the whole system. Today, we will introduce 10 causes of hydraulic pump failure.
Coupling installation error
Because the fit clearance between coupling and shaft is too small or no clearance, the bearing will be injured when it is knocked hard, which will lead to early damage of the bearing and affect the life of the whole pump core.
Coaxiality out of tolerance
If the concentricity exceeds the specified value during installation, the bearing and the whole pump core will be eccentric and early damaged, and the shaft will also be cut off (the shaft is cut off at the thickest place of the shaft head), and the coaxiality is generally controlled to be less than or equal to 0.1 mm.
The oil is too dirty
Because the oil tank is not sealed, the surrounding dust and debris mixed into the oil, resulting in the cleanliness of the oil exceeding the standard. If the filter accuracy is not enough or there is no filter, the pump core will be quickly scratched and damaged.
The oil temperature is too high
Since there is no cooling device, the oil temperature will increase continuously during the continuous use of the machine. If the oil temperature is higher than 70 ° for a long time, the service life of the oil pump will be greatly shortened, and it will be damaged in half a year to one year.
Oil metamorphism
Due to the use of expired hydraulic oil or regenerated oil, the surface of pump core parts is black or sticky. The impurities, poisons and corrosivity in the oil can cause early damage to the oil pump.

Water in oil
In the water cooling device, due to poor sealing, water enters into the oil, and the oil is milky white. The metal parts inside the oil pump will rust or locally rust, and the pump will accelerate wear and shorten its service life in high-speed rotation.
Change the direction of oil port
When the direction of the oil port is not suitable and the inexperienced customer adjusts it by himself, the pump core is not inserted into the hole. At this time, the space of the oil suction port of the oil pump is reduced, and the oil suction is blocked.
Bearing snap ring falling off
The bearing retaining ring (laminated ring) of the oil pump is made of 0.7 × 2 mm steel plate. Its main function is to prevent the bearing from falling off. Due to the thin steel plate, the retaining ring will fall off if the striking force is too large when installing the coupling of pump shaft.
Instantaneous overpressure
There is no connection between the high-pressure rear cover and the broken shaft, or between the high-pressure front cover and the broken blade or stator. This situation is actually caused by instantaneous overpressure. When the internal pressure of the oil pump exceeds the pressure it can bear, the weakest parts in the pump will be damaged.
Change the direction of oil port
When the direction of the oil port is not suitable and the inexperienced customer adjusts it by himself, the pump core is not inserted into the hole. At this time, the space of the oil suction port of the oil pump is reduced, and the oil suction is blocked.
Bearing snap ring falling off
The bearing retaining ring (laminated ring) of the oil pump is made of 0.7 × 2 mm steel plate. Its main function is to prevent the bearing from falling off. Due to the thin steel plate, the retaining ring will fall off if the striking force is too large when installing the coupling of pump shaft
Instantaneous overpressure
There is no connection between the high-pressure rear cover and the broken shaft, or between the high-pressure front cover and the broken blade or stator. This situation is actually caused by instantaneous overpressure. When the internal pressure of the oil pump exceeds the pressure it can bear, the weakest parts in the pump will be damaged.

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