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12-30-2012, 11:47 AM
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#1
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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Dweeb air bag compressors?
Anyone know of a small 115 volt compressor (that they've used) to keep the rear air bags up while sitting on a slab? We all know how little room we have for storage, but I don't want to buy something that won't give me 100 psi+.
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12-30-2012, 12:38 PM
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#2
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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This is the one I use for keeping my Airstream's tires aired up. It is rated for 150 psi, but I've never set it that high. It's small enough to store in the passenger-side front seat footwell when I'm not using it.
8pc. Portable Air Compressor: Take Craftsman Power to Go with Sears
__________________
I thought getting old would take longer!
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12-30-2012, 12:40 PM
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#3
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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12 volt compressors that will get up to 125 psi and attach to the trailer (or truck) batteries are available for around $60-70. If you need to add air to the tires, they are great when boondocking.
Gene
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12-30-2012, 01:13 PM
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#4
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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I wonder if those 12 volt compressors will lift the air bags to 125 psi? She never deflates because I keep my eye on them, but I can see when we get down to 70 psi, which is fine, but I want to be able to keep her up on her haunches to keep us level.
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12-30-2012, 02:43 PM
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#5
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Rivet Master
1982 28' Airstream 280
Port Angeles
, Washington
Join Date: Aug 2008
Posts: 1,943
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Quote:
Originally Posted by Mike Leary
I wonder if those 12 volt compressors will lift the air bags to 125 psi? She never deflates because I keep my eye on them, but I can see when we get down to 70 psi, which is fine, but I want to be able to keep her up on her haunches to keep us level.
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Hey Mikey why don't you just turn the key on? Your dweeb pump keeps the bags up when you drive, it will do it while you are parked. I would bet that it will fill the tank and bags in less time then it would take to get a portable pump out and hooked up. And it doesn't take up any new space.
Now if you want a spare pump for a back-up or to fill tires and such that is another issue. I carry a Porter Cable pancake unit. Porter Cable 150 PSI, 6 Gal Oil-Free Pancake Compressor C2002
I took the tank off, ty-wraped the air manifold to the front of the pump housing and with a tee ran the fill hose into the manifold with another quick disconnect. It makes a small handy unit with lots of power.
__________________
Cheers, Dan
________________________________________
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
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12-30-2012, 06:59 PM
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#6
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Rivet Master
2016 Interstate Grand Tour Ext
Wildwood
, Florida
Join Date: Oct 2009
Posts: 1,236
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Brillant
Quote:
Originally Posted by Smartstream
Hey Mikey why don't you just turn the key on? Your dweeb pump keeps the bags up when you drive, it will do it while you are parked. I would bet that it will fill the tank and bags in less time then it would take to get a portable pump out and hooked up. And it doesn't take up any new space.
Now if you want a spare pump for a back-up or to fill tires and such that is another issue. I carry a Porter Cable pancake unit. Porter Cable 150 PSI, 6 Gal Oil-Free Pancake Compressor C2002
I took the tank off, ty-wraped the air manifold to the front of the pump housing and with a tee ran the fill hose into the manifold with another quick disconnect. It makes a small handy unit with lots of power.
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Absolutely brilliant! That solves the problem of portability vs power. I carry one in my truck bed to air up the trailer tires since the small auto pumps just crap out. That baby is getting surgery this week!
__________________
Dave and Felicia
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12-30-2012, 07:44 PM
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#7
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Rivet Master
1982 28' Airstream 280
Port Angeles
, Washington
Join Date: Aug 2008
Posts: 1,943
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Quote:
Originally Posted by wxbuoy
Absolutely brilliant! That solves the problem of portability vs power. I carry one in my truck bed to air up the trailer tires since the small auto pumps just crap out. That baby is getting surgery this week!
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Thanks Dave but in my case I didn't have a lot of choices. On my '82 the under-body storage compartments are very small. There are no pull out drawers, just a bottom hinged door and only about 10" or 11" tall. I'd have to go measure to be sure because my memory is feeble and I have slept since I last measured. Anyway most everything I looked at was too tall to fit. I do have an old medical oxygen tank that I can add if I need a accumulator/storage tank. I did carry it for awhile but never used it so now it's left in the shop.
By the way I have a friend who has a similar Dewalt and it is much louder than the Porter Cable. Plug them in and run them before you decide the one to buy.
__________________
Cheers, Dan
________________________________________
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
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12-31-2012, 09:21 AM
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#8
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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I should have expained more fully: I've got the dreaded "sag of the bag". The on-board compressor (new in '99) now cuts off at 70 psi instead of 110 psi. The switch (replaced in '05) is an 80-110 psi model. I don't want to fool with it until we get back north, hence the reason for a small compressor. I'm thinking (hoping) it's the switch, any ideas?
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12-31-2012, 09:31 AM
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#9
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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Mike, if the switch has a history of failure, you could jump it and see if that works. But I think something else is at work—maybe an air leak somewhere. The switch does not know what the air pressure is unless is has some sort of limiter built into it. If it is a simple on/off switch, I can't see how it affects the upper limit of psi. Or a reset button is turning it off at 70 psi because of another reason such as too much current draw above 70 psi. The reset may have become over sensitive or may be reacting to a leak causing a high current draw. Of course, the whole thing may have become worn out.
Gene
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12-31-2012, 11:49 AM
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#10
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Rivet Master
1982 28' Airstream 280
Port Angeles
, Washington
Join Date: Aug 2008
Posts: 1,943
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Quote:
Originally Posted by Mike Leary
I should have expained more fully: I've got the dreaded "sag of the bag". The on-board compressor (new in '99) now cuts off at 70 psi instead of 110 psi. The switch (replaced in '05) is an 80-110 psi model. I don't want to fool with it until we get back north, hence the reason for a small compressor. I'm thinking (hoping) it's the switch, any ideas?
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Mike if it's a typical Square D type switch pull the cover off and watch the switch cycle. You can manually operate the "paddle" to make up the contacts to power the pump. You can isolate whether the pump is overheating and tripping a breaker or if the pressure switch is tripping at too low a pressure. At least it will point you in the direction of the problem.
I would advise fixing it now rather then later. If the pump is failing you don't want to be driving with low bags. If the switch is failing you have the same problem of low bags. Buying a portable compressor and stopping every few miles to pump up the system is not really a good idea.
__________________
Cheers, Dan
________________________________________
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
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12-31-2012, 12:41 PM
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#11
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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Thanks for the sage advice. The bags are fresh, as are the leveling valves. She'll hold outside-induced 110psi for a couple of weeks, but the compressor only comes on at below 70 psi. I'm sitting on gravel and getting around under there is a p.i.t.b. I'll find some hard flat surface, borrow a creeper and see what's what. It's starting to point at the compressor, I'm afraid.
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12-31-2012, 03:31 PM
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#12
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Rivet Master
1982 28' Airstream 280
Port Angeles
, Washington
Join Date: Aug 2008
Posts: 1,943
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Quote:
Originally Posted by Mike Leary
Thanks for the sage advice. The bags are fresh, as are the leveling valves. She'll hold outside-induced 110psi for a couple of weeks, but the compressor only comes on at below 70 psi. I'm sitting on gravel and getting around under there is a p.i.t.b. I'll find some hard flat surface, borrow a creeper and see what's what. It's starting to point at the compressor, I'm afraid.
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I don't know Mike, there isn't much the compressor can do if the switch doesn't give it 12 volts to do it's thing. Are you reading 110 psi. at your tank or at the bags? If at the tank that tells me your leveling valves are holding air. You won't consume any air until the ride height lowers enough to release air to the bags.
If your pump comes on at 70 psi. when does it cycle off? The pressure switch doesn't care the pressure in the bags, only the tank pressure. As long as the tank pressure is above the pressure in the bags the leveling system will function. Also when the compressor comes on at 70 psi. does it actually increase the pressure in the tank? Also does the switch shut off the compressor or does it overheat and trip a breaker?
I guess a big question is what your gauge is reading. My dash guage reads my bag pressure. I can watch the needle fluctuate as I hit bumps going down the highway. My bags normally run at 75 to 77 psi. My pressure switch starts the compressor at 80 psi and shuts off at 100 psi.
One last thing, you gotta toughen up my friend. I don't have any "hard flat surface" around here. It's all dirt, mud, or gravel. I use cardboard or an old piece of carpet to lay on. Not using a creeper also gives you a few more inches under the low hanging parts.
__________________
Cheers, Dan
________________________________________
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~
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01-01-2013, 09:04 AM
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#13
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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Quote:
Originally Posted by Smartstream
Not using a creeper also gives you a few more inches under the low hanging parts.
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Yes, and a few of us know why you don't use a creeper, Dan the big man. I'm going to spread a tarp underneath today and see if I've got a slow leak/check wiring, etc. Last night, I did feel air coming from the schrader valve and dogged it down, we'll see.
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01-01-2013, 01:51 PM
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#14
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Rivet Master
Currently Looking...
1984 31' Airstream310
Ajo
, Arizona
Join Date: Mar 2007
Posts: 7,649
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Schrader valve was leaking, I filled a small dish with water and stuck it under the tank: bubbles, lots of them. I don't think it's my whole problem, but it did not help. E-Bay has the whole fitting for about $9.00.
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