| Author |
Message |
mike merrill (Mikemerrill71yahoocom)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 1:38 pm: | |
Is there anyway to deflate the air bags on a 4905 without getting to the leveling valves,I am getting it ready to raise the roof and think I want to make sure all of the weight is on the blocks,Thanks for any ideas, Mike H8H-649117 |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 7:42 pm: | |
Can't you just open the main tank's petcocks (drain valves) and let
all the air out? |
Pete/RTS Daytona (Pete_rtsdaytona)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 8:07 pm: | |
Mike / John
I would think - draining the main tanks will not do it - most buses have check valves to prevent the air from the suspension tank from bledding back into the main tank
I believe that if you start jacking up a corner
(look for the buses jacking points or a very solid point on the frame or engine carriage) - the leveling valve will start dumping - There is usually a 5-7 second delay built into the valves
Remember the air bag will keep depleting as long as that corner is jacked up - so be very carefull that you can remove the jack when it does fully deplete the air bag.
Move on to the next corner -
Pete RTS/Daytona |
Gus Causbie (Gusc)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 9:01 pm: | |
4104 suspension air will bleed back into the main tanks once the main pressure falls to 65psi. This is to provide additional brake air for emergencies and I assume the 4905 is no different. |
Tom Caffrey (Pvcces)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 9:42 pm: | |
Gus, that's only the tank air, not the air in the airbags. All that has to be done to bleed airbags is to lift the coach a fraction of an inch.
If you lift it with something that is not strong enough to carry the whole weight of that part of the coach, something will give.
The same applies if you lift a part of the coach that's not designed for the whole weight; in that case, you will bend something in the coach.
Be careful.
Tom Caffrey PD4106-2576
Suncatcher
Ketchikan, Alaska |
Michael Malloy (Busnut06)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, January 08, 2006 - 9:59 pm: | |
Mike,
If you use Tom's method make sure that your jack is almost completely extended before beginning your lift. If you don't, the jack will bottom out as the body drops. Take care.
Michael |
Gus Causbie (Gusc)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 09, 2006 - 12:46 am: | |
Tom,
Yes, you're correct. It is only the air from the Aux tank, not the bags. I went back and read it again.
Why do my air bags leak down overnight in cold weather (20-10F)? In mild or warm weather they stay up 2-3 days. I know air shrinks when cold but if that were the cause they would rise back up during the warming of the day, they don't.
There must be some valve or other component affected by the cold but I have no idea what it might be.
Anyone have actual experience with this? |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 09, 2006 - 7:06 am: | |
Gus quotes “Why do my air bags leak down overnight in cold weather (20-10F)? In mild or warm weather they stay up 2-3 days. I know air shrinks when cold but if that were the cause they would rise back up during the warming of the day, they don't.”
You party answer (air shrinks) your question, a mechanical linkage connect between axle to leveling valve is your “rest of the story”. Whenever leveler-valve demanding air to keep at giving level or height setting…it taken more air out of storage tank to maintain it. However when required psi in air storage tank is lower then minimum to maintain after few warm & cold weather cycle will depleted your air supply.
Another word with no-leakage in air & suspension system, it can still bleed thorough leveler from uneven settling during long-parking unless a good check valve is installed before each leveler valve.
Pete/rts method is easy way to lower but put block under “jack” point so it won’t bottoming your jack.
Caution just jack only to start leveler valve to hiss or bleed than remove jack before it coach fully lowered. Otherwise damage can occur to weaker “jack” point.
FWIW
Sojourn for Christ, Jerry |
Bob Shafer (Michigander_bob)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 09, 2006 - 7:40 am: | |
Mike,
Get a 4x4 and cut 4 pieces to 4" and install them between the axel and bumpers. Works for me.
Bob 4104-2346
Flint, Mi |
Sojourner (Jjimage)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, January 09, 2006 - 9:10 am: | |
Forgot to mention...But must first drain out air supply tanks or you have recurring automatic-leveling.
FWIW
Sojourn for Christ, Jerry |
Gus Causbie (Gusc)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 10, 2006 - 12:10 am: | |
Thanks, Jerry. That makes all kinds of sense to me. |