Wrong, pressure difrention does not plow a role, But atmosphere pressure may.
It would be the air that you say is in the oil that makes the cavity of air during cavitation
Cavitation, how it happens,
Hydraulic oil contains approximately 9% of dissolved air. When the oil cannot flow into the pump fast enough to match pump’s intake volume, air is pulled out of the oil. The air bubbles travel into the pump, and when they reach an area of relatively high pressure, they collapse (implode). The resulting shock waves cause a steady, high-pitched whining sound and damage to the insides of the pump.
To have air entrained into the oil there would have to be a leaky fitting. whole a crack in the suction line from outside air source,
Seing as the plow pump’s suction port and the pump is submerged in the tank , the only way it could entraine air Is if it ran empty.
Causes of Cavitation
Fluid velocity is inversely proportional to the size of the hydraulic line. Most pumps have a suction line that is larger than the pressure line. This is done to keep inlet velocity low, making it very easy for oil to enter the pump. Any blockage, such as a plugged suction strainer or filter, can cause the pump to cavitate. A contaminated suction strainer is the most common cause of cavitation, simply because it is hidden deep within the oil in the reservoir.
Aeration occurs whenever outside air enters the suction inlet of the pump.
Many maintenance technicians confuse cavitation and aeration. Although the two conditions have similar symptoms, their causes are entirely different.
Cavitation is the formation and collapse of air cavities in liquid. When hydraulic fluid is pumped from a reservoir .
The movement of the rotating elements—gears, in this case, but the same applies to pistons and vanes—causes a drop in pressure at the “SUCTION line”. The resulting pressure difference between the reservoir and the pump inlet causes the fluid to move from the higher pressure in the reservoir to the lower in pump’s