runaway parents Posted May 9, 2018 Report Share Posted May 9, 2018 Don't let this happen to you guys. So I found out I had a air leak in one of my cab air bags. Figured since I had to change one might as well do them both. Supplier had to order them in. Took a couple days. Didn't have to seeing that I already had the collets and o rings but I thought I would change out the ptc fittings with new ones. BIG mistake the new ptc fittings came with thread sealer on them. This was a very hard red substance caked on the threads. I asked parts salesman if I had to put thread tape on them. He said no. Sealant on fittings will be just fine.So I put every thing together. Went to air it up nothing all the air was leaking out of the bottom of my new air bags. Took them back apart to find out the thread sealant had actually cracked the bottom of the air bag where the ptc fitting screwed into it. Not only did this to one but both of them. Took air bags back to supplier they seem to think they can warrantee them out wont know till tomorrow we will see. So fare the seem to a purity good outfit to get truck worked on . Did not realize the bottoms of these things where made of plastic seems kind of od. Link to comment Share on other sites More sharing options...
SuiteSuccess Posted May 9, 2018 Report Share Posted May 9, 2018 13 minutes ago, runaway parents said: Don't let this happen to you guys. So I found out I had a air leak in one of my cab air bags. Figured since I had to change one might as well do them both. Supplier had to order them in. Took a couple days. Didn't have to seeing that I already had the collets and o rings but I thought I would change out the ptc fittings with new ones. BIG mistake the new ptc fittings came with thread sealer on them. This was a very hard red substance caked on the threads. I asked parts salesman if I had to put thread tape on them. He said no. Sealant on fittings will be just fine.So I put every thing together. Went to air it up nothing all the air was leaking out of the bottom of my new air bags. Took them back apart to find out the thread sealant had actually cracked the bottom of the air bag where the ptc fitting screwed into it. Not only did this to one but both of them. Took air bags back to supplier they seem to think they can warrantee them out wont know till tomorrow we will see. So fare the seem to a purity good outfit to get truck worked on . Did not realize the bottoms of these things where made of plastic seems kind of od. That red stuff was probably LocTite Red. You can’t break it loose easily without heat which would probably melted something. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted May 9, 2018 Report Share Posted May 9, 2018 I think they gave you the wrong size fittings. Were the base plates on the bag's metal or plastic? Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
runaway parents Posted May 9, 2018 Author Report Share Posted May 9, 2018 Plastic where ptc fittings go on bottom Link to comment Share on other sites More sharing options...
runaway parents Posted May 9, 2018 Author Report Share Posted May 9, 2018 Ptc fittings screwed rite in buy hand and gave them about a quarter turn with wrench and I think that was all it took. Split the female fitting on the air bag three ways. It two was plastic. Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted May 10, 2018 Report Share Posted May 10, 2018 Oops.... The fittings are a tapered thread. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
beyerjf Posted May 10, 2018 Report Share Posted May 10, 2018 The air bags on a Freightliner have a push in fitting, no threads, nothing to tighten and break. Plastic airline just slides in. Release it by depressing the ring. Jeff Beyer temporarily retired from Trailer Transit 2000 Freightliner Argosy Cabover 2008 Work and Play 34FK Homebase NW Indiana, no longer full time Link to comment Share on other sites More sharing options...
beemergary Posted May 10, 2018 Report Share Posted May 10, 2018 19 minutes ago, beyerjf said: The air bags on a Freightliner have a push in fitting, no threads, nothing to tighten and break. Plastic airline just slides in. Release it by depressing the ring. My old 1984 Peterbuilt still has the flare fittings with rubber air lines. I did just put in new seats and the new valves had push fittings. The old girl will hold tank air for a week-suspension over a month. Thinking tank air loss is comming from transmission. Even still has air wipers. I like old. Link to comment Share on other sites More sharing options...
Lance A Lott Posted May 10, 2018 Report Share Posted May 10, 2018 A lot of fittings come with thread sealant pre installed. The rule of thumb is to never put a metal fitting in plastic. They make renenforced plastic fittings probably best to use those if you can. Link to comment Share on other sites More sharing options...
Darryl&Rita Posted May 10, 2018 Report Share Posted May 10, 2018 35 minutes ago, Lance A Lott said: The rule of thumb is to never put a metal fitting in plastic. This is also a Code rule in both plumbing and electrical codes. For this exact reason. I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
runaway parents Posted May 11, 2018 Author Report Share Posted May 11, 2018 Second attempt got replacement air bags today this time I rebuilt old fittings with new o rings and collets put wet thread sealant and screwed them in HAND tight so far so good it is holding air no leaks . Link to comment Share on other sites More sharing options...
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