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Old 02-04-2018, 01:48 AM   #1
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Draining the Air Tanks

I have a Spartan K2 chassis and was wondering when I go to drain the air tanks of moisture, do I leave the engine running and up to pressure or have the engine off? Is 15 seconds each the correct amount of time to pull the 3 lanyards?
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Old 02-04-2018, 02:28 AM   #2
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15 seconds is plenty of time, you actually don't need that long unless you get a lot of water, if the engine is running that is fine and will help keep the pressure up but isn't mandatory, back in my trucking days we had guys that forgot to drain their tanks and sometimes you would get a lot of water from a tank, 1/2 pint maybe. Todays systems have an air dryer that will get rid of most of the water when working correctly.
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Old 02-04-2018, 02:44 AM   #3
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I drain my air tanks once a month, probably a little obsessive, but better that than not at all. You are advised by Spartan to drain the tanks in order, pull the Silver lanyard first, then the Green, lastly the Red. The brake system will be happy.

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Old 02-04-2018, 06:18 AM   #4
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Originally Posted by BBorgo View Post
I drain my air tanks once a month, probably a little obsessive, but better that than not at all. You are advised by Spartan to drain the tanks in order, pull the Silver lanyard first, then the Green, lastly the Red. The brake system will be happy.

Bob
Would the sequence not matter since the tanks are isolated by a one way check valve ? I drain all my tanks at the same time, maybe I should change the procedure ?
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Old 02-04-2018, 06:42 AM   #5
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The Spartan training procedure is to do it engine off, but with the tanks at full pressure and the ignition on ... to monitor the gauges. (Also means it's a 2 person check!)

The Silver lanyard first, the wet tank, pull and hold until the air stops hissing. There should be no appreciable water and both gauges should not move.

Then the Green lanyard, primary tank (rear air), pull and hold until the hissing stops. Once again, no appreciable water and one gauge should read zero.

Finally the Red lanyard, secondary tank (front air and accessory), pull and hold until the hissing stops. Both gauges should now read zero.

In addition to draining any moisture, done this way the process ensures the check valve between the primary and secondary tank is functioning correctly. I perform this check once a month.
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Old 02-06-2018, 01:25 AM   #6
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Thank you all for your responses.
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Old 02-06-2018, 09:23 AM   #7
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Would the sequence not matter since the tanks are isolated by a one way check valve ? I drain all my tanks at the same time, maybe I should change the procedure ?
I'm wondering how a guy can drain all three at the same time as my (Freightliner) lanyards are split between the driver & passenger wheel wells. So Spartan gives you all three in the same area? +1 for Spartan!
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Old 02-06-2018, 09:55 AM   #8
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The theory behind draining in order is to drain the moisture in the first tank ( wet ), so it doesn't carry over to the next two.

As far as primary and secondary, it won't matter. They are both fed from the wet tank.
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Old 02-06-2018, 10:14 AM   #9
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Here's a document I have about the Spartan process for checking tanks. This came from Cruzer (Mark Quasius)

How to Drain Your Air Tanks.pdf
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Old 02-06-2018, 07:14 PM   #10
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I'm wondering how a guy can drain all three at the same time as my (Freightliner) lanyards are split between the driver & passenger wheel wells. So Spartan gives you all three in the same area? +1 for Spartan!
On our Essex, K2 all the lanyards are located behind the front right wheel. And also makes easy to step in and look at the gauges.
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Old 02-06-2018, 07:15 PM   #11
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Using the Spartan guidance, to drain the tanks to zero pressure would mean pulling the lanyards for like 10 minutes. The air escapes from where the lanyard attaches and it takes a long time to manually drain the tank to zero.
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Old 02-06-2018, 10:17 PM   #12
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Question, when the tanks are drained does this dump the air bags ?
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Old 02-07-2018, 04:16 AM   #13
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Originally Posted by gimlimike View Post
Would the sequence not matter since the tanks are isolated by a one way check valve ? I drain all my tanks at the same time, maybe I should change the procedure ?
The sequence does matter and should be;

1- drain wet tank first (silver)
2- drain primary service tank second (green)
3- drain secondary service tank third (red)

If there is water in the wet tank and not drained first, it can be pulled into the primary or secondary service tanks when draining them. Hence, it's important to allows bleed/drain the wet tank first.
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Old 02-07-2018, 04:18 AM   #14
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Quote:
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Question, when the tanks are drained does this dump the air bags ?
Since pulling the 3-lanyards to drain condensation/water from the wet tank, primary and secondary air tanks only takes a few seconds each, the process will not dump the air bags.
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