How to get longer bearing life

The main factor that limits the use of mineral oils in high temperature applications is their oxidation stability, rather than the viscosity thinning or thermal stability. In the presence of air, it is generally not advisable to use mineral oils in any application at temperatures above 200 degrees F (93 degrees C).

From the book "Lubrication Fundamentals"

“Packed for life” bearings are used for many light-to medium-duty services. These bearings have seals and are packed at the factory with a special long life grease intended to last for the life of correctly applied bearings. In some cases, the service range of bearings of this type is extended by making provision for relubrication by one of the following methods: removing one seal and applying grease through the seal by means of a gun with a hollow needle, or forcing grease through holes in the outer ring. Care is necessary with the latter method because only a small amount of pressure will dislodge some seals.

Lube-Trivia: Film-forming Lubricant Properties

Test your knowledge and prepare for ICML lubrication and oil analysis certification.

QUESTION: What property of the oil has a major effect on the film-forming properties of the oil?

Q& A: Maximizing Your Offline Filtration System

"I have a large hydraulic reservoir about 12 feet wide, 10 feet tall and 15 feet long. We presently perform off line filtering with the suction line at one end of the tank near the bottom. The return line is at the same end near the bottom about six feet from the suction line. Is the positioning of the two lines acceptable? Does the fluid recirculate between the two lines without good dispersal between clean and contaminated fluid? Should the two lines be separated by a greater distance?"

Ideally, the suction and return lines should be as far apart from each other as possible. If there are baffles in the reservoir, the suction and returns should at least be on opposite sides. If I were to place a return and suction line for offline filtration in your system, I would place the suction line of the offline circuit near the main system return to the reservoir, about 5 to 10 inches from the bottom. The suction line should be as close to the offline pump as possible. I would place the return line at the opposite corner of the reservoir. If possible, I would include a diffuser at the termination and try to get the termination end about half way up the level of the oil.

Jason Kopschinsky, Noria Corporation