Cab Air Bags

Cab Air Bags

Cab Air Bags

 PDF of Volvo Parts for Cab Air Bags andd Shocks CabAirSprings.pdf
SIBERNUT
22 July 2009
05:45 AM		 While tracking down the ever-elusive air leaks Sunday, I soaped everything.  Noticed there was a small amount of bubbles at the top of the cab air bags where they meet the flat support.  Now, I have had the suspension air bags apart**, and they are "forced" over a lip much like a tire on a rim.  I'm wondering if it's bag-time, or because of the way they are made some leakage is acceptable.  Any input from experience appreciated.

**(Yes, with enough air pressure and unrestrained, they can achieve lunar orbit, trust me.  An exciting event.)
Hogrydr
22 July 2009
05:58 AM		 Ron
I have not had any leaks in that area.  Always been a dry rot or split in the bag or a line or fitting.  I would think that as you said, like a tire.  There should be no leakage in that portion of the bag when inflated.  IMO
Jim
pacecar
22 July 2009
05:45 PM		 That is exactly what I had on my 98 610 for one of my air leaks.  The bags would deflate in less than an hour.  I replaced both bags and they stay up for 4 days now.  Depending on where your driver side fuel tank is, mine is right under the cab bag, it is difficult to get the capture ring off from the bottom of the old bag.  I got a pair of long needle nose pliers, 12", and just twisted the ring back and forth until it broke.  To get the new ring on I had to slightly open up the tangs that grab the plastic in order to get it on.  Also when I bought my air bags from Volvo they did not include these rings and you will need new ones.
SSDriver
23 July 2009
12:14 AM		 The lip/seal area needs to be cleaned likely.  Something as simple as a little rust can cause this.  I have pneumatic tires on a handtruck and one would always go down in a day or so.  Sounds like its may share a similar type of seal from your description.  Just could not get a tight enough seal between it and the plastic rim.  There is a sealant that some tire companies use to help prevent it if it's really proving difficult to get it to seal.  Worked for me.  Of course you may have to take it off/apart to do this.
FWIW