| Air compressor question.... [message #344902] |
Thu, 04 July 2019 18:13  |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Question for you folks....that little Dana air compressor for the rear suspension system, how much pressure does it develop?
Im trying to figure out what crack pressure, for the one way valve is needed and how much air should be in the rear suspension....the note i have says between 100 and 120psi but i just cant see that little guy doing that.
Thanks
Rich
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Air compressor question.... [message #344906 is a reply to message #344902] |
Thu, 04 July 2019 18:58  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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6cuda6 wrote on Thu, 04 July 2019 19:13Question for you folks....that little Dana air compressor for the rear suspension system, how much pressure does it develop?
Im trying to figure out what crack pressure, for the one way valve is needed and how much air should be in the rear suspension....the note i have says between 100 and 120psi but i just cant see that little guy doing that.
Thanks
Rich
Rich,
Thanks for filling the sigfile.
Isolators are not expensive, look at marine stores and Ebay. You want a 100 amp or greater. The standard alternator can actually do 96 (I measured) given the correct conditions. You can plug one in now and add a combiner later if you choose.
The answer to your current question is..... About 150 psi .... That is what mine would do just after a complete overhaul. I suspect it was that good for at least a few days. How much pressure is needed depends on the weight in the rear. That includes potable, waste tanks, fuel and what ever else you have loaded back there.
Now that I have a name, I can properly welcome you. This is an very different group of wonderful and supportive people. It is more than just a collection of people that have similar coaches. That is what the GMC Assist list is all about. That is just the beginning. The only other group that I know that is like this is that of the watermen that are my world and for that reason, I like to share a common greeting that I paraphrase here. So,
May the Good Lord bless this coach and all those that set forth within her.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Fwd: Air compressor question.... [message #344912 is a reply to message #344910] |
Thu, 04 July 2019 20:15 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Thanks for the official welcome Matt and thank you folks for all the info....this one rums but i gather it may need a little servicing as i dont think it putting out that kind of pressure......hmmmmm....another task to the list...lol.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Air compressor question.... [message #344942 is a reply to message #344902] |
Fri, 05 July 2019 18:50 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I rebuilt mine about 15 years ago at one of John's clinics. Installed it and forgot about it after that. I set my high pressure limit to 128 PSI and fixed a couple of air fitting leaks. I have not worried about it or done anything to the air suspension since. It next to never is neededyor runs except to changing road or weight conditions like at refuel stops. On heavy cross winds or changing taper roads it will kick on to make up for the varying load on the bags.
I have spare compressor new in the box somewhere in the coach but never needed it. I do not to even remember ht brand it is. Air suspension operating at OEM conditions, never needs any maintenance except to drain the accumulated water in the added drier filter maybe one a year.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Air compressor question.... [message #344944 is a reply to message #344942] |
Fri, 05 July 2019 19:32 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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The story goes like this actually.....coach was fully aired up (i suspect max) all the way home with no leaks (picked it up like that, not my settings)....once home i hit the "lower" right switch and the right side hit the dirt then i flipped the switch to air it up, compressor comes on but nothing really happens so being the mechanic i am i start tearing into it......one way valve into tank leaking, compressor output seems weak as well....notice gauge installed doesnt show more than 20psi so out it comes (its baffed to). Guess i know the solenoid valves and switches work as it held air and dumped air....hahaha....oh the games one plays to get a darling back healthy....lol.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Air compressor question.... [message #344947 is a reply to message #344944] |
Fri, 05 July 2019 20:17 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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In the Maintenance Manual X7525 under the Rear Suspension section there are pages on the Dana compressor and also on the air valves. It may be of interest to you.
Emery Stora
77 Kingsley
Frederick, CO
> On Jul 5, 2019, at 6:32 PM, tonka6cuda6--- via Gmclist wrote:
>
> The story goes like this actually.....coach was fully aired up (i suspect max) all the way home with no leaks (picked it up like that, not my
> settings)....once home i hit the "lower" right switch and the right side hit the dirt then i flipped the switch to air it up, compressor comes on but
> nothing really happens so being the mechanic i am i start tearing into it......one way valve into tank leaking, compressor output seems weak as
> well....notice gauge installed doesnt show more than 20psi so out it comes (its baffed to). Guess i know the solenoid valves and switches work as it
> held air and dumped air....hahaha....oh the games one plays to get a darling back healthy....lol.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Air compressor question.... [message #344948 is a reply to message #344947] |
Fri, 05 July 2019 20:33 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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emerystora wrote on Fri, 05 July 2019 21:17In the Maintenance Manual X7525 under the Rear Suspension section there are pages on the Dana compressor and also on the air valves. It may be of interest to you.
Emery Stora
77 Kingsley
Frederick, CO
> On Jul 5, 2019, at 6:32 PM, tonka6cuda6--- via Gmclist wrote:
>
> The story goes like this actually.....coach was fully aired up (i suspect max) all the way home with no leaks (picked it up like that, not my
> settings)....once home i hit the "lower" right switch and the right side hit the dirt then i flipped the switch to air it up, compressor comes on but
> nothing really happens so being the mechanic i am i start tearing into it......one way valve into tank leaking, compressor output seems weak as
> well....notice gauge installed doesnt show more than 20psi so out it comes (its baffed to). Guess i know the solenoid valves and switches work as it
> held air and dumped air....hahaha....oh the games one plays to get a darling back healthy....lol.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Unsubscribe or Change List Options:
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Yes thank you for the info...been reading up on it, along with some tech bulletins and some club news letter info, as at on point this vehicle owner was a GMCMI member
Rich Mondor,
Brockville, ON
77 Hughes 2600
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