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Drive hub temperature
Not sure this is an issue but…Fairly long drive towards New Orleans. Stopping for the night and checking tire temps etc. Scanned the drive hubs. One was 156 degrees (on shade side) other was 133 degrees. Is this anything significant or is everything normal?
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13 Replies
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That is not very hot. Just braking for a stop creates a lot of heat.
If you are concerned try to get in the habit of checking temps for a period of time so you can establish “normal”. Before I got Pressure Pro I was pretty consistent about checking temps and over time I knew what to expect and even today when I shoot temps it is not the specific reading that is as important to me as a deviation from what I have learned is my normal range
I still periodically remove sensors and check pressures and adjust them with a digital pressure gauge I know to be accurate, and I also do a walk around and shoot temps even though the PP has temp readouts. I have learned for example if I set tire pressures at what the Michelin chart says for my axle weight after a long run of a couple of hours my tire sidewall pressures are not going to vary more than 5 or 10 degrees from one another with the sunny side being warmer. I also check the wheel temps, but other than looking for one wheel hotter than others I am not really getting a good reading of the hub temps because of the hub caps that go over the lug nuts.
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Thanks Jon. I’ll work to establish my “normal.” On my drive wheels I took off my hubcaps due to them consistently coming loose.
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This is an fyi Chris.
In a truck your main gauges across the top of your dash are engine water temp. trans temp and differential temp.
Why our buses don’t have axle temp baffles me, you have the engine oil and trans temp on your pro driver.
160 to 180 degrees is normal for rear axle, I do the same and look for out of normal temps on a walk around. If your in mountains 200 is not uncommon but checking averages is best.
Running at 150 like A1 said is cool.
Later
bv
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“In a truck your main gauges across the top of your dash are engine water temp. trans temp and differential temp.”
Bernie: I wonder the same thing. Especially in light of all the horsepower and torque from the big Detroit going through a single differential versus most high horsepower/torque semi tractor pulling a heavy load pushing all their power through two differentials.
Is there a bung in the differential sump that one could install a temp prob for differential temp gauge?
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You know there might be, I’ve never looked close enough.
Eaton sells the sensors.
Later
bv
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Bernie…we did not have differential temp sensors on any of our tractors. Never had the need for them and they were not very long lived in our climate in any event. Those who did have them had issues with corrosion on the wiring. We also never had transmission temp sensors either. We never had a need for them.
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You never had big trucks.
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bv
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Is this going to be where two guys compare size????????
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I had a large car with rear end temp and transmission temp, but fuel was only .31 and Mark was just a puppy.:)
I had a 94 Foretravel U280 and it did have rear end temp, was amazing in rain how quick the temp would fall.
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Ah yes, the good old days of cheap fuel. We had a fuel jobber from Amoco that used to get us pricing that was good for the entire year. I think it was either ’69 or ’70 that is was .23/gallon for the entire year. You don’t see that anymore..
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My 1989 had a diff temp gauge; my 1999 did not. The bung was there, I have installed one in my ’99 and I feel it’s absolutely essential if you do heavy towing. I could exceed 300F oil temp if I were careless.
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A long time ago at a Prevost seminar they showed us how in an effort to optimize performance and keep weight down how the Prevost engineers design and select components for the intended use.
I think as long as we avoid the obvious strains on our coaches, such as keeping weight down, minimize max performance driving, etc. every component is going to work well for the job it is asked to do.
But to speak to Joel’s pulling of a heavy trailer in mountainous terrain I think his experience with differential temps is understandible and expected. I one had a turbocharged plane with no turbo inlet temperature gauge and no restrictions as to turbo inlet temp. When I called the factory and spoke to the engineers regarding that I was assure that in their testing for certification they could never get the TIT high enough to become an issue. I think that is exactly why Prevost does not put gauges in to monitor certain things like differential fluid temps.
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All that said … Trust, but Verify.
1999 XLV X-6872, liberty #440
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