Plunger pump Insufficient output flow or insufficient output oil.

1. Insufficient suction is caused by excessive resistance in the oil suction line or inadequate oil supply, such as excessive pump speed, low oil level in the tank, air leaks in the suction line, or a clogged oil filter.

2. Excessive leakage is caused by excessive clearances in the pump and inadequate sealing system performance.

3. If the swashplate inclination angle is too small, the pump displacement will be low; in this case, the variable-displacement piston must be adjusted to increase the swashplate inclination angle.

China National Petroleum Corporation’s emissions are not zero.

When the swashplate angle of a variable axial piston pump is zero, it is referred to as the neutral position. At this point, the pump’s output flow should be zero; however, in some cases the neutral position deviates from the midpoint of the adjustment mechanism, resulting in residual flow even at the midpoint. This is typically caused by misalignment, loosening, or damage to the control unit, necessitating resetting, tightening, or replacement. Plunger pump Insufficient conformal force and wear of the tilt-angle trunnion can also cause this phenomenon.

III. Output Flow Fluctuations

Fluctuations in output flow are influenced by a variety of factors. In the case of variable-displacement pumps, inadequate control of the variable mechanism is often the root cause, resulting from insufficient amplifier power, component failure, or ineffective spring-based piston control. When the control piston becomes unstable, flow instability typically accompanies pressure fluctuations. To address such failures, it is generally necessary to disassemble the hydraulic pump, replace damaged components, add damping, increase spring stiffness, and raise the control pressure.

IV. Abnormal Output Pressure

Plunger pump The output working pressure is determined by the load capacity and is approximately proportional to the input torque. There are two distinct types of faults associated with the output pressure: one is excessively low output system pressure, and the other is excessively high output pressure.

V. Vibration and Noise

Vibration and noise occur simultaneously, posing serious hazards not only to machine operators but also contributing to environmental pollution.

VI. Hydraulic Pump Overheating

There are two primary causes of hydraulic pump overheating: mechanical frictional heat and fluid frictional heat.

VII. Oil Leakage

The cause of the oil leak may be a damaged main shaft oil seal or a defective shaft, such as scratches or excessive internal leakage, which increases the pressure on the seal and leads to seal failure or extrusion. ;

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