More than one bearing mounting misconception exists in maintenance circles. Some are unfounded, others less so.
More than once, we have heard of an experienced maintenance technician trying out a hasty bearing change with a hammer, even at the end of the third shift. Then he was surprised to find that the next day the drive was already humming. So it’s time to clarify: what are the misconceptions that even the best of us have, and how can we avoid them?
Bearing mounting misconception 1: “A hammer is your best friend”
Truth: The hammer and bearing can only be used in the same sentence if the word “never” is included. If you hit any outer bearing part while trying to fit it on a shaft, you will either hit an inner or outer ring crosswise. This will mechanically damage both the roller and the raceway. From then on, it’s just a matter of time before it starts to run erratically, buzz or stall.
Misconception 2: “More grease = better lubrication”
Reality: over-lubrication is just as harmful as under-lubrication. The grease is squeezed out, heats up and then “cooks” the bearing. In addition, the rotational resistance increases. Mixing different types of grease is a particular problem. Some of them react with each other and become a gelatinous, emulsion-like mass that does not give a gram of lubrication.
Bearing mounting misconception 3: “This fit will be fine, it will fit just by looking at it”
Reality: the fit is not a snap fit. The connection between the shaft and the inner ring of the bearing, and between the housing and the outer ring, requires patience and a measuring tool. If the shaft is too small, the bearing will move on it, if it is too big, it will be under tension. Both are suicide for the bearing.
Misconception 4: “Lubrication is not that important, just make sure there is something in it.”
Reality: lubricant doesn’t just “smooth” the motion. It also provides heat dissipation, corrosion protection and protection against contamination. Poorly chosen or worn lubricant is a straight road to failure.
Misconception 5: “When I replace a bearing, I just take it out and put in a new one”
Reality: if a bearing fails, there is a reason. It could be that the housing has become oval, the shaft has become worn out, or some dirt has got in. If you don’t inspect the surroundings, the new bearing will end up in the same place, with the same fate.
Bearing mounting misconceptions are not created by accident. A bearing is not just a component, it is a warning. If you watch carefully what it tells you, it will teach you – if you don’t, it will teach you. Expensively. Bearing installation is not routine work, it’s precision. If you have it, your machines run, they don’t hum. Those who don’t can order spare bearings in abundance. We are at your disposal for the latter!
If you’re tired of struggling with traditional bearing fitting techniques or just want to take maintenance to a new level, Simatherm and Simatool bearing fitting tools will help. These tools are designed precisely to make the life of a maintenance technician easier and turn tedious tasks into clean, precise and fast.
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