Video Vignettes - Aeroshell Grease Answer Videos
View the step by step answer videos here.
How to properly pack a wheel bearing.
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Today we are demonstrating how to clean and repack bearings.
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But first a word on grease.
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It’s easy to think that grease is grease.
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That you can use the same product everywhere.
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This is incorrect.
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Greases are highly specialised lubricants with different thickness, wear properties and chemical factors designed for specific areas of your aircraft.
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Using the wrong grease can cause premature wear, ruin seals or impair the performance of a moving part.
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So consult your maintenance manual to ensure your grease meets the correct specifications.
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Now to the bearings.
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If you’re using new bearings, check the date of manufacture.
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If the bearings are more than three years old, you or a qualified mechanic, will need to clean and repack them.
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You may want to do this anyway as the grease the bearings were packaged in could be wrong for your application.
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The next step for both new and used bearings is to remove all excess grease with a clean shop towel.
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Then gently wash the bearing in a suitable solvent like mineral spirits
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Next, air dry it, be careful to keep the bearing from spinning which can cause scoring.
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Now, carefully inspect the bearing for damage, corrosion or pitting.
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Ok, if it’s ok, wash it in alcohol like this IPA to remove fingerprints and film left by the mineral spirits.
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Now we are ready to pack the bearing.
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You can use a wheel-bearing packer or the hand method.
If you can do it by hand, wear the right rubber gloves full protection and keep finger prints off.
Also check your manual to check you’re using the right grease.
For most wheel bearings you’ll use a MIL-G-3545 grease like AeroShell 5.
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Put a small amount of grease onto your palm and work it into the bearing all the way around.
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Turn the bearing to make sure it’s smooth and that grease covers all rollers.
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Now it’s ready for installation.
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Remember when you think of maintenance, don’t forget the grease.
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I’m Ben Visser. Good flying