We are asked quite often which is the best way to remove bearings in cases and we are quick to point out that whenever possible, we use heat (and cold) and try at all costs not to use presses and/or pullers. The reason for this is it is far too easy to damage the bore the bearing is in especially if it's aluminum. But the "how much" and "how to" bring heat in is critical. We exclusively use an oven. Preferably a convection oven, where a fan circulates the heat and keeps things much more uniform.

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IF YOU MUST USE FORCE...Most bearing bore damage occurs when the bearing is "cocked" slightly and is forcefully pulled from the case. Be aware of that and correct if necessary. Whenever possible, we prefer to use a slide puller along with a heated case. If you're having trouble, use your temp gun and verify you're at 325-350 deg./F. Surprisingly, 10 to 20 deg. makes a big difference.

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1) Never place aluminum parts on hot plates of any kind. It is next to impossible to heat evenly and even harder to control the temperature. Remember, when you approach 400 deg./F, (from metallurgical standpoint) you're in the danger zone.

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TO INSTALL BEARINGS, HEAT IS THE KEY.When pressing bearings in place, there's a lot of things that can go wrong. First off, you should only apply even force on the outer races. And how often does one have the correct press ring on hand? So the easy way is to grab a socket and press on the inner race. Bad plan. Second it's easy to slightly "cock" the bearing thereby damaging the bore in the process. Third it's difficult to know when the bearing has "bottomed out" with a press. So we apply more force and go by "feel". A better approach is to heat the cases, and if you want, put the bearings (or races) in the freezer. That way they drop right in place!

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We typically place the items in an oven set at 350 deg./F. We place them so the bearings are at the top and quite often when they reach temperature, you'll hear them fall out. For most applications, we limit the oven time to 30 minutes An infrared temperature gun is very valuable here. If there are any bearings left in the cases, we (carefully) drop the cases on a hard floor from about 1". This usually dislodges the stubborn ones. In the event there's one being difficult, we prefer a slide puller, the one we use we purchased from McMaster Carr.

2) Never use a torch of any kind, again for the above reasons, plus the fact that aluminum dissipates heat rapidly and you wind up overheating areas that also damages the metallurgy of the aluminum.

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Few people realize how critical the clearances either on the outer bearing bore or inner bore on bearing life and performance. Because if you have a shaft that's .001" larger than the bore, that inner race grows by that amount. Now take a bearing bore that's .001" smaller than the outer race and that outer race will now become smaller. Bear in mind that there needs to be enough clearance between the balls to allow space for the lubricant to work. If that clearance is not there, you are now forcing hard contact between the balls and races. The test we use to determine if all is well is to direct compresses air across the balls to initiate rolling. If the bearing turns freely, all is well. If it resists turning, it's time to check the clearances.

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