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PT & WB (Twin Axle Pusher Unique Issues) If you have a unique issue with your PT or WB model coach and it can't be answered in one of the other forums here, then this is where you can list it....list your PT Parts here too.

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  #11  
Old 05-05-2021
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Gosh Jim... That's the first time I have seen that profile picture of your previous Bird; very sharp. You have a knack for picking pretty Birdies.

Timothy
Yeah it is a good looking Bird. I always had a lot of compliments on the colors and the condition of the paint. This is one of my favorite pics of her. She shines like that all the time. She always did when I first got her and I kept it up. click on it to enlarge it a couple of times.

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  #12  
Old 05-05-2021
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Originally Posted by Randy Dupree View Post
I think your going to find a leaky PPV,in the hardest place on earth to get to.
How big a fella are you?
It could also be one of the LP-3 low pressure switch which is up near the frame rail just forward the drive axle. It is next to a PPV, you have one for each side I believe.
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  #13  
Old 05-06-2021
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Originally Posted by Randy Dupree View Post
I think your going to find a leaky PPV,in the hardest place on earth to get to.
How big a fella are you?
I’m not a small man..

It stays aired up (suspension) so maybe it’s not a dump valve. It’s even aired up from yesterday and the air leak hissing has gone away so that must be a separate tank..
But it can’t seem to air up using the aux compressor itself like the leak is that substantial
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  #14  
Old 05-06-2021
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I’m not a small man..

It stays aired up (suspension) so maybe it’s not a dump valve. It’s even aired up from yesterday and the air leak hissing has gone away so that must be a separate tank..
But it can’t seem to air up using the aux compressor itself like the leak is that substantial
If the bus stays aired up then it must but the auxiliary tank or something related to it. Turn on the Gast compressor and see if it starts hissing again.
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  #15  
Old 05-06-2021
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Quote:
Originally Posted by whited44 View Post
I’m not a small man..

It stays aired up (suspension) so maybe it’s not a dump valve. It’s even aired up from yesterday and the air leak hissing has gone away so that must be a separate tank..
But it can’t seem to air up using the aux compressor itself like the leak is that substantial
So I have an issue when airing up with the auxiliary compressor, it’s one of my TR-3 inversion valves.. I replaced them and it still occasionally gets stuck open and will not close. Mine makes a funny noise when trying to air up, the air passing through the little rubber disc that covers the exhaust port flaps causing the sound. I would suspect one of those inversion valves.
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  #16  
Old 05-06-2021
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Originally Posted by 1984Lodge View Post
So I have an issue when airing up with the auxiliary compressor, it’s one of my TR-3 inversion valves.. I replaced them and it still occasionally gets stuck open and will not close. Mine makes a funny noise when trying to air up, the air passing through the little rubber disc that covers the exhaust port flaps causing the sound. I would suspect one of those inversion valves.
YES!!!!! It does make a funny sound. what does one of these things look like??
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  #17  
Old 05-06-2021
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there is usually a specific part number, on a metal tab, as it needs to be replaced with same pressure cut off, there is a family of several TR3’s
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  #18  
Old 05-06-2021
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Originally Posted by whited44 View Post
YES!!!!! It does make a funny sound. what does one of these things look like??
I believe the funny 'groaning' sound from the dump valves oscillating is caused as the dump pressure slowly escapes out the mouse valve vent. Doesn't mean there's anything wrong.

And just because the suspension remains aired up, it doesn't mean that the wet tank and/or PPV circuit isn't leaking down. I believe there are check valves that can maintain pressure to the suspension even if pressure is lost in the supply side.

Attached is a pic of a (leaking) dump valve for reference.

Also attached is a pic of the PPV and associated assembly that Randy referred to. It's forward of the air dryer.
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  #19  
Old 05-06-2021
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I think inversion valves were used on coaches with air throttle and air cruise control so... I don't think a 93 WB has any inversion valves?
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  #20  
Old 05-06-2021
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Quote:
Originally Posted by mose View Post
I believe the funny 'groaning' sound from the dump valves oscillating is caused as the dump pressure slowly escapes out the mouse valve vent. Doesn't mean there's anything wrong.

And just because the suspension remains aired up, it doesn't mean that the wet tank and/or PPV circuit isn't leaking down. I believe there are check valves that can maintain pressure to the suspension even if pressure is lost in the supply side.

Attached is a pic of a (leaking) dump valve for reference.

Also attached is a pic of the PPV and associated assembly that Randy referred to. It's forward of the air dryer.
Thank you very much...
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