April 26, 2023 by Jake Schell
Finding the root cause of leaks is important, even if the surfaces and gaskets appear to be in good condition
If it ain’t broke, don’t fix it. Cliché? Well, yes, one would be hard-pressed to find a technician who does not hold a familiarity with that alleged truth. When first considered, the concept in the proverb makes good sense. Granted, the drive to improve vehicle operation has led to virtually thousands of innovations. Little chance exists that inquisitiveness will, or even should be, driven from the technical mind. But what about the “don’t fix it”?
The story of my great-grandpa and his Caterpillar Twenty tractor comes to mind. The operator’s manual indicated an oil change and lubrication service should be performed once a year, regardless of how many hours the tractor was operated. So, religiously following the maintenance instructions, he would go out and change the oil and pump grease in all the required fittings. Never mind that the tractor had not been started, much less operated, over the last year.
Did grandpa’s tractor maintenance schedule help or hurt anything? Other than the cost of materials and quite a lot of old grease oozing out of various points, probably not much harm done. Of course, I cannot discount the fact that I still used (to?) shake hands with the old Cat, discing up the field into the late 1990s until it was sold to a tractor collector.
Fast Forward to Axles on Today’s Trucks
Take a Closer Look at the Axle Vent
One point to inspect whenever addressing an axle leak is the inconspicuous vent. As an axle operates, heat develops. As the air in the axle assembly heats up, it expands and will escape through the point with the least resistance to maintain that pressure.
Thus, the axle vent. The vent is typically placed somewhere at the top of the axle housing and may be attached to the end of a hose, reaching higher up to the frame rails. If at any time this vent or hose gets smashed or plugged up, the heated air will try to escape through seals and gaskets causing an oil leak.
While there is hardly a need to reinvent the vent, taking a look at the vent and vent piping for issues when checking the axle oil level makes for a simple maintenance step that could help keep the truck in service.
EDITOR’S NOTE: Check out Jake Schell’s complete line-up of monthly columns in Fleet Equipment Magazine at https://www.fleetequipmentmag.com/author/jake-schell/.
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About the Author
Jake Schell
Jake Schell is the Associate Product Manager for Mitchell 1’s commercial vehicle product line. He has been with Mitchell 1 since 2001. Prior to coming to Mitchell 1, Jake spent 20 years as a technician, with Chevrolet Master certification in the transmission category as well as ASE certifications in both car and truck.
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