Kneeling bus

[fairbus]

Can anyone tell me about a kneeling bus. Our church bus is now lower at the front passenger door for some reason. It never has before. Luke told me it my be in a kneeling feature that we didn't know it had. Someone could have flip a switch somewhere by accident. It's a 1981 MC9 bus. Any help out be great. Thanks

[lostagain]

MC9s didn't have a kneeling feature. I would look at the ride height valve. Maybe the linkage for it just came undone.

[chessie4905]

79 and 80 4905's had kneeling as an option.

[fairbus]

Anyone know what this part is?

[fairbus]

It is under the bus up by the steps

[freds]

It is under the bus up by the steps

Aw given it's not attached to the suspension maybe it was a step extender?

[buswarrior]

Your picture, perhaps a remote tank drain? Where does the attached cable to the bottom go?

As noted, no kneeler in an '81 MC9, look for some corruption of the levelling valve.

Happy coaching!
Buswarrior

[fairbus]

As noted by others we found no kneeling switch on bus. The picture of the part is actually upside down. We hopefully plan on tracing down where that line goes to tonight. The leveling valve is just a few years old and the drivers side seems to come up fine just not the passenger side and the passenger side air bags are also only a few years old. Going to trace that line and spray some soapy water on and around passenger air bags to see if we find any leaks other than that part. Thanks for replies.

[RJ]

. . . the drivers side seems to come up fine just not the passenger side. . .

Fairbus -

What you're describing is a classic symptom of the passenger side leveling valve on the rear axle acting up. It's stuck, binding, or the linkage has come loose.

FWIW & HTH. . .

RJ

[fairbus]

So the rear leveling valve can effect the front and put it in a bind that it won't lift. Now just a fyi we did do a test where we disconnected both the rear leveling valve arms so the rear would not lift to see if it was getting in a bind and we had the same result in that the front passenger would not lift but about 1".

[lostagain]

That points to a problem with the air bag or the air supply to it.

[lostagain]

That points to a problem with the air bag or the air supply to it.

[Runcutter]

You'll note that many of us include our location in our signatures.  Often, it's discovered that another member is close by and can take a look.  So, where are you? 

Arthur

[fairbus]

Sorry we are in Duncan, OK

[fairbus]

Let me start from the beginning when this all started. Our church has a 1981 MCI MC9 bus. When we first installed our new rolling lobe bellows on the rear drivers side(because the air rail had a leak and it was leaning to the drivers side at the back) the front passenger side doesn't seem to air up (which did just fine before we replaced that rear divers side).The drivers side front does which seems strange since they work off the same leveling valve. We thought maybe with the new driver rear bag aired up so high now that maybe it was putting a lot of pressure on the front so we put the passenger side rear rolling lobe bellow on and it didn't help any. We started out with the rear driver side leaning down. Now the front passenger side leans down the most. It seems strange that all was fine with the front until we change the back with the new bags. Any help is greatly apricated. We are going out tonight to see if we can find anyone air leaks besides the on in the pictured above part that even MCI doesn't know what it is and it has MCI on the side of the part. But what still seems strange to me is that all the front was fine until we put that new air bag on the back.

Fairbus
Duncan, OK