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Old 11.17.2007
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Draining the water out of the air tanks
Only been driving for 1 1\2 years and now driving an 02 Freightliner Classic XL. How do you go about making sure there is no water in the air tanks? I have seen a metal pull cord looking thing on the passenger side just above the fuel tank, is that the drain?

Winter coming up, just thought I would ask.

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Dave
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Old 11.17.2007
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the pull cord is probubly your airtank drain but if you dont want to pull on it to find out ask a freightliner dealer. you should drain your air tanks daily even in the summer. the schneider procedure is to drain at pretrip and every break. thats sometimes 5 times a day but better to drain them more often than have your brake lines freeze up and you cant stop.
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Old 11.17.2007
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Check with the shop for the locations if the manuals aren;t still in the truck, but you should have more than one drain on the truck. Usually, they will have 2-3 air tanks, and each of them will need to be drained. I don't drain at each stop, but usually hit the tanks when I am refueling, which means at worst every other day. My truck hs a tendency to be a "dry" truck, and makes very little liquid in the air system. I have driven other trucks that just liked to make moisture, and they needed to be drained daily.
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Old 11.17.2007
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Quote:
Originally Posted by Burky View Post
Check with the shop for the locations if the manuals aren;t still in the truck, but you should have more than one drain on the truck. Usually, they will have 2-3 air tanks, and each of them will need to be drained. I don't drain at each stop, but usually hit the tanks when I am refueling, which means at worst every other day. My truck hs a tendency to be a "dry" truck, and makes very little liquid in the air system. I have driven other trucks that just liked to make moisture, and they needed to be drained daily.
yea, i check mine for moisture daily but rarely ever get anything but MAYBE a slight mist for the first 1/2 second. i guess it has a good drier?
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Old 11.17.2007
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Dryers vary greatly in effectiveness, some trucks I have driven never have even a mist and others get water all of the time. You can check to see where that cable goes to if you can see the air tanks. Old trucks will often have the cable broken off, I have drained those by pushing on the valve with a long rod. The ones you have to turn often leak after you drain them unless you loosen up any corrosion in the valve seat.
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Old 11.17.2007
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yep mine doesn't seat properly now and will slowly loose pressure overnight. (i sprayed it with windex and saw bubbles)
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Old 11.17.2007
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Many older trucks will actually have an oily mist come out with the water vapor when draining the air tanks. I forgot what this signifies though. I know it aint good. Maybe 1 of the other fellas can chime in with what causes oily residue to accumulate in the air tanks.
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Old 11.17.2007
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Even with an air dryer you should drain the tanks daily. We would always drain the tanks during post trip but our post trips were everyday. If you do do it at post trip and have the old type screw valve don't leave the drain open and walk away.
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Old 11.20.2007
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If you get oil when you drain your tanks, your compressor is about to go out. Also, air dryers have a filter, if you have a dryer and get lots of moisture, you need a new air drier filter.
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