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Old 08-21-2018, 11:41 AM   #1
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Replacing Air Dryer Cartridge

I'm doing routine maintenance, today, and decided I should know more about changing the Air Dryer Cart. The spin on cart says it is a Wabco 4324202202 cart and when looking that up it also says a Wabco 4324100202 will fit. Spartan calls for a 950011k cart, but I don't know who makes that one.

What are the procedures for changing the cart? Do I have to empty the air tanks before spinning this off? If so, how, as I don't see any lanyards to pull, like some others have talked about. Any info would be appreciated...
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Old 08-21-2018, 11:54 AM   #2
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The 3 air tank lanyards are up front on either side of the frame behind the front tires. You will have to turn the front wheels as sharp as they will go to see and reach the small cable loops sticking out through the frame rails. These should be bled every 2 months or 2,000 miles.

The Wabco desiccant air line filter is on the passenger side rear near your fuel/water filter. No you don't have to bleed the air pressure to change it. I believe the service interval is 3 years in normal weather conditions. I used a heavy duty filter clamp wrench with cheater on handle to loosen it- it was really on super tight. Be sure to wipe off the canister mounting flange with a clean cloth to remove any dirt particles or residue. Took me about 20 minutes to change it out. The filters aren't cheap- bought mine at a rally through Spartan.

Happy Trails
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Old 08-21-2018, 02:40 PM   #3
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Thanks for the info... I found the air canister while changing my oil. I ordered 2 new ones and will replace it when it comes in.

Thanks for the info on the lanyards. I looked all over this coach and probably would never have found them. I'll take another look later...

Rick
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Old 08-21-2018, 06:14 PM   #4
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"RJOL"......Make sure you wash the old canister and mount thoroughly, dry and then remove the canister. This way you don't introduce any dirt. You may need a strap to spin it off. Lastly, lightly lube the o-ring, but don't get any lube inside the cartridge. Spin it on and firmly hand tighten.
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Old 08-21-2018, 08:44 PM   #5
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Quote:
Originally Posted by Dutch Star Don View Post
"RJOL"......Make sure you wash the old canister and mount thoroughly, dry and then remove the canister. This way you don't introduce any dirt. You may need a strap to spin it off. Lastly, lightly lube the o-ring, but don't get any lube inside the cartridge. Spin it on and firmly hand tighten.

Thanks, Don... I'll follow your advice on this... I appreciate the help and others helping with info on the lanyards. I just could not find these. I've got a real slow leak in the #2 (front system) air. It leaks down to below 65psi overnight. I'd like to cycle the lanyards and see if that solves it. If not, and it becomes worse, I will have to take it in for maintenance.
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Old 08-21-2018, 10:14 PM   #6
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Get some soapy water in a spray bottle and check your airlines when you do the cartridge exchange. Don't forget the lines to the parking brake and gauges.
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Old 08-21-2018, 10:55 PM   #7
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I tried to remove my cartridge with a strap wrench and breaker bar and it wouldnít budge. Drained the system using the lanyards and then it came off super easy.
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Old 08-22-2018, 09:17 PM   #8
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Quote:
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I tried to remove my cartridge with a strap wrench and breaker bar and it wouldnít budge. Drained the system using the lanyards and then it came off super easy.


Just a concern, I can reach in on air and pull lanyards with my boat buoy grasper. If I dump the air via HWH dump air, then I canít reach lanyards. I see where someone said to turn tires and pull lanyards. 2 things on this if I turn all the way to right and release wheel it is going to self center, also even if you had someone in MH holding wheel would there not be a concern of air dumping and tire crashing into fiberglass?
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Old 08-22-2018, 09:26 PM   #9
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I used the awning hook from the manual awnings over some of the smaller windows. I was able to reach in and hook the lanyards one at a time with the wheels in the straight forward position.
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Old 08-22-2018, 09:50 PM   #10
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Quote:
Originally Posted by Tigerfan1 View Post
I used the awning hook from the manual awnings over some of the smaller windows. I was able to reach in and hook the lanyards one at a time with the wheels in the straight forward position.
Looked, today, but didn't see... The problem is that to get around the tire I'd have to start the coach and "air up." Before doing that, I have always made sure the slides are "IN." Then I might be able to turn the wheel and see these mysterious lanyards. How many are there, and are they on both frame rails? How do you know which one to pull?
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Old 08-23-2018, 05:16 AM   #11
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There are three and on my Spartan Chassis they are located on the outside passenger side frame rail near the front tire. They are color coded and there is a procedure on which order to pull while checking your dash air gauges to ensure your tank valves are working properly. If you call Spartan or google air tank lanyard procedure you will get the procedure. I am sure other members of this forum will chime in and post the procedure.
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Old 08-23-2018, 06:17 AM   #12
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Here are some details on the air system from my Spartan Academy manual -

1. Recommended change interval for the Waco System Saver 1200 model is every two years.

2. The three lanyards are color coded silver, green, and red.

3. Sometimes dirt, grease, or residue from undercoating may make it difficult to see the colors on the lanyards. At the Spartan Academy, they distribute color coded carbiners that you can snap into the rings. This makes it easy to identify the colors and much easier to snag them with an awning hook.

4. The silver lanyard is for the wet tank. The green lanyard is for the primary tank system that services the rear axle and tag and the rear suspension system. The red lanyard is for the secondary tank system that services the front axle brakes and suspension system. They should be pulled in that order - silver, green, red.
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Old 08-23-2018, 07:04 AM   #13
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Hi,
1. The air tanks must be drained fully or you are not going to get the canister off.
2. Determine the proper order for the lanyards to be pulled (tank drained).
3. Get some plastic wire ties.
4. Put one wire tie on the lanyard to be pulled first, two on the second and three on the third. This way you'll never need to look it up again.
5. The canister is very difficult to remove. I had to get my SIL to come over and get it off. And that was using a cheater bar.
6. For me, every three years is what I do.
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Old 08-23-2018, 08:44 AM   #14
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Thanks for the info... I will be looking at all of this, soon, and report back if there are problems or questions...
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