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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 11-10-2017
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Kiwi3 Kiwi3 is offline
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Default Drive Axle Suspension will not fill - 94 WB

On my 1994 40' Widebody my suspension dump dummy light will not go off on the dash. The suspension appears to be aired up and the front/rear gauge on the dash shows 120psi when full.

I thought that it was the sensor, but after getting home and doing some experimentation filling and dumping the suspension and suspension/tag measuring the height. I think that the tag was doing all the lifting in the rear. Without the tag the rear suspension only goes up about a half inch where the front goes up 5 inches. So I checked the clappard valves, and they are not leaking. It appears that the rear suspension on the drive axle is not filling. I don't hear any air leaks from the bags with so I'm assuming it is the rear dump valve itself.

But if the dump valve was open wouldn't I hear air from the valve when I'm applying air pressure?
Also where is the dump valve(s) for the rear? Are they on the leveling valve?
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Last edited by Kiwi3; 11-10-2017 at 09:56 PM. Reason: Further troubleshooting...
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Old 11-10-2017
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After more susp up/down I'm thinking something is clogging the air supply line to the T junction to the two leveling valves. Neither side has any pressure in the airbags, and I don't hear any blowing out the dump valve with the compressor running. I don't hear any air coming out of the bags either. Looking at the 94 pneumatic diagram, the same airline provides air to the tag that goes to the drive axle bags. So I'm not sure how the "more important" side got plugged up.

So if I have the green goo plugging up the line and 120PSI can't blow it out... How do you clear the line?
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1994 Wide Body #106048
"Going Galt"
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Old 11-10-2017
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After more reading tomorrow it is time to block and brace the bus butt in the air and get under there. I'll check the control rods to the leveling valves to make sure they didn't pop out or bend.

While I'm down there I'll have to reroute the tank drain lanyard lines - both snapped when I tried to pull them. Any suggestions on running the lanyards?
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Dothan, AL
1994 Wide Body #106048
"Going Galt"
bruce.griffin67@gmail.com
334-350-8564
Blue Bird Map

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Old 11-10-2017
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run some plastic pipe to the side of the coach and put the drain valves way out there,easy to do,cheap too.
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Old 11-10-2017
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Quote:
Originally Posted by Randy Dupree View Post
run some plastic pipe to the side of the coach and put the drain valves way out there,easy to do,cheap too.
That nails it. Almost every school bus has manual drain valves on one side or the other. Federal requirements require drivers to drain them every day. Why Bluebird did not put them on Wanderlodges is beyond me. Some days there could be a pint of oily crud and water coming out.
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Old 11-10-2017
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Quote:
Originally Posted by Randy Dupree View Post
run some plastic pipe to the side of the coach and put the drain valves way out there,easy to do,cheap too.
Do you mean run the lanyards through the plastic pipe, or to extend the drain to the side of the bus?
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Dothan, AL
1994 Wide Body #106048
"Going Galt"
bruce.griffin67@gmail.com
334-350-8564
Blue Bird Map

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Old 11-11-2017
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Quote:
Originally Posted by Kiwi3 View Post
Do you mean run the lanyards through the plastic pipe, or to extend the drain to the side of the bus?
Your messing with me,right?
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Old 11-11-2017
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Quote:
Originally Posted by Randy Dupree View Post
run some plastic pipe to the side of the coach and put the drain valves way out there,easy to do,cheap too.
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  #9  
Old 11-11-2017
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Wouldn't there be a danger of the plastic pipe being hit by road debris and leaking/bursting?
I wouldn't want to check the spring break via drain line breakage.
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Dothan, AL
1994 Wide Body #106048
"Going Galt"
bruce.griffin67@gmail.com
334-350-8564
Blue Bird Map

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Old 11-11-2017
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I guess i should have said plastic air brake tubing,same as all the trucks use .
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