| Author |
Message |
Charlie Krueger (Charliek)
Registered Member
Username: Charliek
Post Number: 9
Registered: 10-2006
Posted From: 207.200.116.13
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 20, 2006 - 12:41 pm: | |
After setting for about 6 hours the air bags on the left side of the bus deflates. I have discovered and fixed several small leaks in the suspension air lines and I have visually checked the air bags for leaks w/soap and water. Short of taking the air bags off, the only thing I can think of is the "check valve" in the suspension. Can someone please help me locate this valve? I suspect it is in the campartment under the drivers seat but I can't identify which unit it is. Any help will be greatly appreciated.
Charlie
4106-1428 |
john w. roan (Chessie4905)
Registered Member
Username: Chessie4905
Post Number: 347
Registered: 10-2003
Posted From: 71.58.126.56
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 20, 2006 - 5:31 pm: | |
That is not the valve you are looking for. Each leveling valve has a check valve built into the port that the main air supply connects to. It is just like the ones used in your tire stems. When air is supplied automatically to the bags that it is connected to ( two to each valve on the rear and four to the valve in the front ) the check valve in the inlet port of the leveling valve keeps the air from leaking back into the air system as the overall pressure drops to 65lbs. At that point, the pressure protection valve up front in the driver's compartment shuts off the air supply to the suspension system to protect the remaining air supply to the brake system. Anyway, either the check valve at the leveling valve is leaking, the internal ckeck valve is leaking ( which would show a constant air leak at the exhaust port on the leveling valve ), or one of the tubing fittings or connection to the air bag bolt fitting on that pair of bags is leaking, or one or both of those bags are leaking. |
Brian Brown (Blue_velvet)
Registered Member
Username: Blue_velvet
Post Number: 398
Registered: 6-2005
Posted From: 72.19.152.144
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 22, 2006 - 1:57 am: | |
If you disassemble each fitting downstream of the airbag and temporarily install a schrader valve, you can readily fill up the assembly and check its air pressure periodically to determine where the leak is. An air gauge teed into the schrader would be even better. Keep working your way upstream until you show a loss of pressure.
I seem to remember the fitting sizes on my old 4106 were oddball... 5/16" or something, but should be available at a decent hardware store.
Oh, and block your coach before crawling under it. I can tell you from experience, it's no fun to have a 13 ton bus come down on you (I was lucky and found a place of refuge near the rear diff).
HTH,
Brian Brown
4108-216 w/ V730
Longmont, CO |
Frank Allen (Frank66)
Registered Member
Username: Frank66
Post Number: 36
Registered: 10-2005
Posted From: 152.163.100.138
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, November 25, 2006 - 4:40 pm: | |
i had the same problem , had to replace the air bags, there is a steel rond insert in the top that rusts out and leaks and you dont see it, could be the problem
Frank Allen
4106 |