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Old 08-11-2010, 06:02 PM   #1
1 Rivet Member
1981 28' Airstream 280
Boise , Idaho
Join Date: May 2010
Posts: 12
Vacuum operated step pushes man over the ledge

The restoration continues on the 81, 28' diesel, we scrapped the isuzu alternator, installed GM alternator to charge batts, installed interface module to operate tachometer, installed 12v vacuum pump with reservoir to operate step, the OEM solenoid was worn out , procured a napa # 2-2057 solenoid to replace it , I cannot get it to work , have tried switching hoses around, etc etc, abandon it and get an electric step or end this everexpanding project with a free matchbook

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Old 08-11-2010, 07:32 PM   #2
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1978 31' Excella 500
Genoa , Nevada
Join Date: Jul 2007
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I find that bees can get into the strangest places and make little mud nests that will stop vacuum.

I admit to being powerless over housecleaning and social niceities
Airforums 22655 and now, WBCCI 22655

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Old 08-11-2010, 08:27 PM   #3
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1983 31' Airstream310
Santa Cruz , California
Join Date: Sep 2008
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The vacuum step is a real puzzle, and the service manual doesn't have anything useful on it. Mine works, but takes a little longer than it should, probably because I have it plumbed wrong. I am still puzzling out two hose components: a length of hose that goes nowhere but is crimped/molded on the end to form a one-way valve, and a length of hose with a carefully cut hole in it. Once I have it figured out I will post a diagram.

Do you get vacuum at the hose from the pump? Can you make the step retract by connecting this to one hose or the other of the actuator?
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Old 08-12-2010, 08:17 AM   #4
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2000 31' Land Yacht
Central , Florida
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Originally Posted by dljosephson View Post
The vacuum ..., and a length of hose with a carefully cut hole in it.... ?
When mice or squirrels attacked the MH, they selectively chewed on wires and vacuum hoses.
Under the dash I ran my fingers along the hoses as I couldn't see them, came across an indent, worked my way under to visiually inspect and the critter had made a hole in 1/4 rubber tubing as if it had been drilled.
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Old 08-12-2010, 08:25 AM   #5
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1986 25' Sovereign
Plant City , Florida
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Ok so I know nothing about your step but when I read the title I could only think that is was a news story about a step extending causing a man to fall over a cliff. LOL
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Old 08-13-2010, 11:07 PM   #6
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1981 28' Airstream 280
Boise , Idaho
Join Date: May 2010
Posts: 12
Dean solved his step problem , since I no longer have the vacuum pump on the alternator, I am using an electric pump with a reservoir , too much vacuum and the electric solenoid can't shift, so I had a slick pneumatic valve that looks and works like a toggle switch, mounted it under the step warning lite on dash, 1 hose to switch from vacuum source, 1 hose to step vacuum diaphram, flip the switch up vacuum retracts step, switch down, cuts off vacuum and bleeds off vacuum allowing step to deploy, anyone need a new solenoid at half cost ?

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