| Author |
Message |
Mike Eades (Mike4905)
Registered Member
Username: Mike4905
Post Number: 120
Registered: 12-2000
Posted From: 24.28.40.72
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 02, 2006 - 4:15 pm: | |
I have an air leak in my 4905. It seems to be in the middle of the bulkhead I haven't been able to get to it. I can't build over 60-70 lbs of air. The bus has settled in the sand in the storage yard. I can't get under it safely. Anyone got any ideas. Mike |
grant goold (Grantg)
Registered Member
Username: Grantg
Post Number: 8
Registered: 9-2006
Posted From: 165.196.109.153
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 02, 2006 - 5:55 pm: | |
Can you attach an external air compressor to the system to help build pressure? If so, you might be able to get the bus high enough to block the frame safely and then begin your hunt.
Be safe! |
Buswarrior (Buswarrior)
Registered Member
Username: Buswarrior
Post Number: 904
Registered: 12-2000
Posted From: 65.92.124.33
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, October 02, 2006 - 7:43 pm: | |
Hello Mike.
Remove the wheels, let's you get at what's behind them.
Spring brake or DD3? Can you get it to move by holding the parking button and giving it the fuel?
60 to 70 pounds makes me think you have a leak in some "past the pressure protection valve" type leak. Does the system build to that point before you hear the leaking and then won't go any higher?
Get your air schematic out and start the detective work!
happy coaching!
buswarrior |
Gus Causbie (Gusc)
Registered Member
Username: Gusc
Post Number: 197
Registered: 11-2005
Posted From: 63.97.117.14
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, October 03, 2006 - 4:59 pm: | |
If it's like a 4104 the air pressure builds up in the main system until it reaches 65psi, then it opens up to the aux air system which includes the suspension, air horn and wipers.
Check to make sure the wipers are off, turn the switch momentarily clockwise and release. The knob should spring back about 1/5 a turn, this is the park position.
If not the wipers you probably have a big hole in the suspension system or air bags. |
Jim-Bob
Unregistered guest
Posted From: 71.16.238.226
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, October 04, 2006 - 9:59 pm: | |
You might have a hole in one of your several air tanks. I think there's a "wet" tank (first after the compressor) between the two bulkheads just fwd of the engine. It only takes a hole the size of a pencil lead to keep the bus from airing up. |
Tom Caffrey (Pvcces)
Registered Member
Username: Pvcces
Post Number: 997
Registered: 5-2001
Posted From: 65.74.65.54
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 07, 2006 - 10:12 pm: | |
It's not likely the wet tank or the first dry tank because of the system pressure, because it takes about 65 psi to overcome the minimum pressure valve between the main and auxiliary systems.
If the gauge is connected to the auxiliary system, like ours is, no pressure will show on it until the main system has reached 65 psi.
If 65 psi is all the pressure that you get, it will not lift your coach unless it is a whole lot lighter than ours at about 27,000 lbs. Ours takes about 90 psi.
If the sound is coming from the engine compartment bulkhead, you could have a leaking skinner valve or hose.
If you don't have DD-3 brakes, you can move the coach some to run it up on a block. That way, you could inspect it safely.
Good luck on your troubleshooting.
Tom Caffrey PD4106-2576
Suncatcher
Ketchikan, Alaska |