| Author |
Message |
John Lacey (Junkman42)
Registered Member
Username: Junkman42
Post Number: 1
Registered: 3-2007
Posted From: 204.49.140.154
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 15, 2007 - 3:03 pm: | |
Hello, I am new to the bus world. I have a mci 7 that was converted by texas custom coach some years back. It looks like it is traveling down hill all the time. What air pressure should I be running in the tag, rear axle, and the front axle. Any and all input would be most appreciated. |
George M. Todd (George_mc6)
Registered Member
Username: George_mc6
Post Number: 107
Registered: 8-2006
Posted From: 207.231.80.150
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 16, 2007 - 12:30 am: | |
John,
The pressure in an air ride suspension is determined by the weight of the bus, and is determined by the leveling valves. The front axle has one leveling valve in the center of the front axle. This valve only controls the height of the front end, the front air bags on both sides are connected by a tee fitting. The drive axle leveling valves, one on each side, govern both the rear ride height, and the side to side relationship. The tag axles do have individual pressure regulators, which are set to the amount of weight to be carried by them, usually only a couple of thousand pounds each.
FIRST OFF, DO NOT GO UNDER AN AIR-RIDE BUS WITHOUT PROPERLY BLOCKING IT AT THE JACKING POINTS!!! That said, it sounds like the linkage has come off of the front leveling valve, or the valve itself has failed. Also possible is an air bag failure. The front leveling valve is in the middle of the bus above the front axle, with an arm connecting it to the middle of the axle. When the valve arm is horizontal, it is "happy" with the height of the bus. If the arm is angling up, the valve is trying to raise the front, but can't.
So, LOOK at the leveling valve with air up and the engine off, to hear front air leaks, and let us know what you find! HTH (hope this helps)
George |
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