HarryS Posted November 19, 2013 Share Posted November 19, 2013 Had the shutters working fine until last week when they stopped closing. The air pressure seems strong to the shutterstat but from there to the shutter piston it seems weak. When I use shop air (120#) direct to the piston the shutters close and open. I removed the cap from the shutterstat and there is a screen and felt washer/filter. They both appear to be OK with no clogging. Is the shutterstat repairable? If not are replacements available. Thanks, Harry Quote Link to comment https://www.bigmacktrucks.com/topic/33566-b-61-673-shutterstat/ Share on other sites More sharing options...
Mike Posted November 19, 2013 Share Posted November 19, 2013 Had the shutters working fine until last week when they stopped closing. The air pressure seems strong to the shutterstat but from there to the shutter piston it seems weak. When I use shop air (120#) direct to the piston the shutters close and open. I removed the cap from the shutterstat and there is a screen and felt washer/filter. They both appear to be OK with no clogging. Is the shutterstat repairable? If not are replacements available. Thanks,HarryHi Harry,It can be repaired with a new rubber diaphram. Air will bypass it and not help shut the shutters. I went to a gasket-rubber company and matched it with what I had and it works fine. I used a small amount of vaseline when reinstalling it. You might want to clean the unit on the firewall if your truck has one. You will find a cotton wick inside of that unit.Hope this helps you.mike Quote Link to comment https://www.bigmacktrucks.com/topic/33566-b-61-673-shutterstat/#findComment-217542 Share on other sites More sharing options...
Freightrain Posted November 19, 2013 Share Posted November 19, 2013 How is the air line? Have you removed the output line and see if you get air pressure directly from the shutterstat? My original line was old enough and had clogged shut going to the shutters.. A coat hanger shoved through it enabled it to work til I got a new line. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/33566-b-61-673-shutterstat/#findComment-217558 Share on other sites More sharing options...
HarryS Posted November 20, 2013 Author Share Posted November 20, 2013 Thanks guys for the info. I'll be back at it tomorrow. Quote Link to comment https://www.bigmacktrucks.com/topic/33566-b-61-673-shutterstat/#findComment-217610 Share on other sites More sharing options...
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