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09 /16/ 25, 3:37amLogin ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1234567[8]910 ]
Subject: Air Leak?


Author:
Don Duncan
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Date Posted: 01/ 20/ 03, 12:24am

1980 FC31

From start up to shut down my rig purges air at a valve assembly to the left front of the air cleaner. This valve has a high pressure copper feed, a nipple that is simply purging air, and two vacuum lines to a canister fixed to the air cleaner (one of the vacuum lines has a tee that goes elsewhere but I have not tracked it down). The assembly looks like a vacuum air valve intended to control the compressed air. But I don’t know what it is for and it is constantly dumping a lot of air. If I block the purging air one of the vacuum lines is blown off.

Any help with this would be greatly appreciated. I just picked the rig up and the manuals appear to be a cross between 1977 and 1980, and very little 1980.

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Replies:
[> Subject: Re: Air Leak?


Author:
Don Duncan
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Date Posted: 02/ 1/ 03, 3:55am

This appears to be a vaccum source for the cruse control ( that does not work). The rushing compressed air draws a vaccum that is stored in the attached canister. If I can't get the cruse to work I'll cap it. By replacing the vent tube, the hissing sound is moved away from the driver to under the rig.

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