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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 11-07-2010
Mikel Mikel is offline
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Default suspension dump

Need help! I winterized my 89 sp 36 and was going to dump the waste tanks before putting it in the barn and the suspension won't air up. I've got about 120 psi showing on both tanks. I suspect a frozen 'sporlan valve as the temps have been below freezing at night, but I don't know it's location. I turned the furnaces on in case it's on the inside and I'm impatiently awaiting results. Any helpful suggestions would be appreciated.
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Old 11-07-2010
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Maybe something simple, Air up switch?????
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Old 11-07-2010
Robert Britton Robert Britton is offline
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120 is what's in your front and rear air brake tanks. Auxiliary tank may not be building air if you left the purge valve open while blowing out water lines...check to make sure that is not the case.
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Old 11-07-2010
Jim Brookshire Jim Brookshire is offline
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Check the steps at the door, they will not retract if the third air tank is not up to pressure.
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Old 11-08-2010
Mikel Mikel is offline
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I checked the purge switch and it was in the off position and the step work fine. If I knew where the electric valve is located, I could check it's function and if electrical run it back to the fuse or switch or air source. Anyone know it's location? Other helpful suggestions will be appreciated. Also I don't hear any air leaks with the suspension switch in either position.
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Old 11-08-2010
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Randy Dupree Randy Dupree is offline
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Quote:
Originally Posted by Mikel View Post
Need help! I winterized my 89 sp 36 and was going to dump the waste tanks before putting it in the barn and the suspension won't air up. I've got about 120 psi showing on both tanks. I suspect a frozen 'sporlan valve as the temps have been below freezing at night, but I don't know it's location. I turned the furnaces on in case it's on the inside and I'm impatiently awaiting results. Any helpful suggestions would be appreciated.

Sporlan valves control water flow.
Are we talking about the suspension not airing up?
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Old 11-08-2010
Mikel Mikel is offline
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I assumed that the solinoid type valves used on the bluebirds were " sporlan" valves. The electrical switch on the dash board must trigger a valve to open to provide air pressure to the suspension. Either there is no air in the tank or the air is not getting to the air bags. The tank is located between the holding tanks and is not accessible. So where do I go from here?
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Old 11-08-2010
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If you can't air up, have you checked your air dryer or bleed off your air tanks lately. Once before I rebuilt my air dryer I had a moisture problem and my air discharge valve on the bottom of the air dryer froze open and I could not air up because the valve had frozen in the open position. As soon has it got warm it aired up, after I rebuilt the dryer I have not had the problem since. Do you hear air around the locale of the air dryer? If you hear air the valve is open, and your AD heater is down. Just a thought.
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Old 11-08-2010
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Quote:
Originally Posted by Mikel View Post
I assumed that the solinoid type valves used on the bluebirds were " sporlan" valves. The electrical switch on the dash board must trigger a valve to open to provide air pressure to the suspension. Either there is no air in the tank or the air is not getting to the air bags. The tank is located between the holding tanks and is not accessible. So where do I go from here?
Mike

There are mini 12 volt air solenoids, usually located behind the front panel forward of the foot brake pedal, they need 12 volts from the dump switch or the spaghetti tubing may have become detached. they look like this picture,
Yellow Cap labeled Mouse
http://www.clippard.com/store/byo_electronic/
There are several , two for the fresh air vents, two for the air seats, (these may be located under the seats) & one to trigger the dump valves.
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  #10  
Old 11-08-2010
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The valves that control the air bags are air pilot operated valves. There are small solenoids located in the front control area, available from the outside. Then these small solenoids send air pressure to the pilot operated valves. I don't know where the pilot operated valves are, under the bus somewhere. You can check there operation with a volt meter. There have been threads about this valves.

I have had trouble in the very cold, with the pilot operated valves, but they would eventually decide to open. I never had to dig into it. This makes me thing it is not cold related. When I say very cold, I mean very cold, -10.

As the day got warmer, can you now air up?
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