A pet hate of mine is hydraulic power units in which the pump has to ‘lift’ the oil into its intake. In other words, mounting the pump above the tank or more precisely, above minimum oil level. Like a suction strainer, it’s another ‘engineered in’ barrier which prevents the pump’s chambers from filling freely and completely.
According to most manufacturers, … Read more
In chapter 13 of The Hydraulic Maintenance Handbook, I discuss the principle of engineering out issues that have the potential to cause recurring maintenance problems. Since maintenance occurs after the event, that is, after the machine is designed and built, this strategy is very much a retrospective one. Which means it’s desirable and preferable not to engineer in such … Read more
During a recent conversation I had with a member who builds hydraulic power units, this observation was made: “Oil coolers are generally resisted by customers because of initial cost and maintenance, so fitting a bigger reservoir, when possible, is often the preferred solution.”
I recall coming across the very same resistance when I was building hydraulic power units for end-user … Read more