There are many either mechanical due to errors in assembly, centering a.s.o. and a couple of basic hydraulic problems.
- first the dirt in oil destroys sliding surfaces and increases gaps and leaks. The finer the oil is filtered the longer the service life and MTBM. Gaps in hydraulics are in the rand of a few µm so that filters have to as fine as possible and with high β factors.
- second is the risk of cavitation it occurs mainly when the pressure at inlet goes too low and air separates from oil. When pressure goes up in the pump the air bubbles implode generating shock waves with a very high destruction effect on surfaces. There is as well a "diesel" effect since the bubbles implosion generates very high temperatures and oil is cracked. Cavitation can occur when a pump is started with an oil too thick either because of low temperature or due to a wrong oil change. An other possibility is that dirt reduced the inlet area. It can also occur if the motor has the wrong rpm- a too high one-.
hydraulics
Re: hydraulics
