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Old 08-22-2013, 10:33 AM   #1
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Suspension won't air up

Started the coach today after a 4 month stay. The air suspension system won't air up. I don't think there is an air leak because it started with 50 psi and when I did a walk around the coach I didn't hear any air leaks. Tried dumping the air and re-airing thinking there are sticky valves (I did this 3 times), but still nothing more than 50 psi.

Thoughts, anyone?

Thanks
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Old 08-22-2013, 10:47 AM   #2
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Try releasing the air brake, pump the brakes a couple of times, set the air brakes, then repeat. This came from Spartan C/S about six years. Has worked for me every time. Hope this helps.
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Old 08-22-2013, 11:10 AM   #3
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Quote:
Originally Posted by Knob Creek View Post
Started the coach today after a 4 month stay. The air suspension system won't air up. I don't think there is an air leak because it started with 50 psi and when I did a walk around the coach I didn't hear any air leaks. Tried dumping the air and re-airing thinking there are sticky valves (I did this 3 times), but still nothing more than 50 psi.
When you say nothing more than 50 psi; do you mean the whole air system didn't build pressure while you walked around ?
If so I've seen this on another unit, the purge solenoid , on the bottom of the air dryer was stuck open , exhausting all the air from the compressor before it got to the tanks and gauges. Because of engine noise , I could not hear the leak, but could feel it when I got my hand close to the valve. The solenoid , was held to the air dryer with 3 bolts , removed, and cleaned it with a spray cleaner, no problems in 2 years since.
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Old 08-22-2013, 03:51 PM   #4
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Thanks for the suggestions. Nothing worked. Emergency Road Service called. They can't come until tomorrow morning. Glad I'm still in the RV Park and not alongside the highway somewhere. I'll update this post when I have the solution.

Stuck in Salt Lake City. Anybody seem my "Knob Creek?" I'm thirsty.
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Old 08-22-2013, 04:31 PM   #5
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some one said it befor i could the purge valve on the bottom of the air dryer was stuck open i have has this happen a few times as well

all so there are auto purge valves on the tanks

the air suspension system is ok as it only gets air in to that tank after some thing like 170 psi on the manes
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Old 08-23-2013, 12:02 AM   #6
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Thanks, Terry.

I plan to mention this to tech tomorrow as he troubleshoots. Hope to get back on the road soon.
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Old 08-24-2013, 11:10 AM   #7
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Update: Finally got a mobile tech on site to troubleshoot and diagnose the problem. He determined that the HWH leveling system is functioning properly. He then spent 5 hours ($$$$$) tracking down why I'm not getting air for the brakes. He checked everything within the air system including the air compressor governor, air dryer, solenoids, etc. He then disconnected the stainless braided line from the compressor, and with the engine running, there was hardly any air pressure from the compressor. He then aired up the system (manually) to 110 psi to check for leaks...none found. Next step, the tow truck arrives on Monday to transport to the local cummins shop
p.
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Old 08-24-2013, 11:15 AM   #8
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OUCH,
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Old 08-27-2013, 11:32 AM   #9
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I seem to remember Cummins had a recall on some compressor or something it's worth going on line and checking it out. May save you a few bucks
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Old 08-27-2013, 12:08 PM   #10
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Pumper...Thanks for the info. I've searched the web and didn't find anything recent concerning the ISL engine. But, Ill ask at payment time. I'm in the shop right now.
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Old 08-30-2013, 12:45 AM   #11
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Found that the air compressor unloader valve was seized up. Cummins replaced the compressor and I'm back on the road. Thanks to all above who posted and offered possible solutions.

Knobby
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Old 08-30-2013, 10:07 AM   #12
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Thanks for posting that your, up and running.
Sorry we could only offer ideas and not an easy ( cheap ) fix.
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