Most hydraulic systems will operate satisfactorily using a variety of fluids. These include multigrade engine oil, automatic transmission fluid and more conventional anti-wear hydraulic oil. But which type of fluid is best for a particular application? While it is not possible to make one, definitive recommendation that covers all types of hydraulic equipment in all applications, the following are some of the factors that need to be considered when selecting (or changing) a hydraulic fluid.
1. Multigrade or monograde
Viscosity is THE single most important factor when selecting a hydraulic fluid. It doesn’t matter how good the other properties of the oil are, if the viscosity grade is not correctly matched to the operating temperature range of the hydraulic system, maximum component life will not be achieved.… continue reading »
In a condition-based maintenance environment, the decision to change-out a hydraulic pump or motor is usually based on either remaining bearing life or deteriorating efficiency, whichever occurs first.
Despite recent advances in predictive maintenance technologies, the maintenance professional’s ability to determine the remaining bearing life of a pump or motor, with a high degree of accuracy, remains elusive.
Deteriorating efficiency on the other hand is easy to detect. Because it typically shows itself through increased cycle times. In other words, the machine slows down. When this occurs, quantification of the efficiency loss is not always necessary. Reason being, if the machine slows to the point where its cycle time in unacceptably slow, the pump or motor is changed out.… continue reading »
It’s now more important than ever to ensure that every dollar spent on operating and maintaining hydraulic equipment is a dollar well spent. Furthermore, it’s imperative that the hydraulic equipment you design, repair or maintain doesn’t LEAK money.
Hydraulic systems are often considered perennial consumers of oil and in turn, make-up fluid an inherent cost of operating hydraulic equipment. But to calculate the real cost of one or more ‘minor’ leaks on a hydraulic machine, the expense associated with all of the following need to be considered:
- Make-up oil.
- Contaminant ingression.
The cost of make-up oil should be the most obvious cost of hydraulic system leaks.… continue reading »