I have an RT here that is doing...err..was...doing the same thing.
Your leak is due to the carrier / powertube oring (in lvl7 or 10) not sealing against the bolt stem.
This causes the reg to just keep bleeding pressure through the bolt and not building up in the dump chamber.
If it were to be sealing right, eventually enough pressure would build up, the on/off pin would push out and the reg seat would close as pressure pre reg, and post reg has been equalized.
If the bolt stem doesn't seal, this will NOT happen.
The reason holding the trigger makes the leak stop is because that will seal off pressure from the reg (making no more air come out....seeming like you fixed the leak...) and there will be none left in the dump chamber and you will just keep any more air from entering the valve by holding the trigger.
FIX?
New powertube oring (lvl 7) or new carrier / oring (lvl 10)
**If a level 10 is in question, this can also be a shim leak rather than a carrier leak.
->In fact I have a lvl 7 here with the same problem because the bolt stem is barely in contact with the oring.
## Bottom line??
->>> New powertube oring.
Your leak is due to the carrier / powertube oring (in lvl7 or 10) not sealing against the bolt stem.
This causes the reg to just keep bleeding pressure through the bolt and not building up in the dump chamber.
If it were to be sealing right, eventually enough pressure would build up, the on/off pin would push out and the reg seat would close as pressure pre reg, and post reg has been equalized.
If the bolt stem doesn't seal, this will NOT happen.
The reason holding the trigger makes the leak stop is because that will seal off pressure from the reg (making no more air come out....seeming like you fixed the leak...) and there will be none left in the dump chamber and you will just keep any more air from entering the valve by holding the trigger.
FIX?
New powertube oring (lvl 7) or new carrier / oring (lvl 10)
**If a level 10 is in question, this can also be a shim leak rather than a carrier leak.
->In fact I have a lvl 7 here with the same problem because the bolt stem is barely in contact with the oring.
## Bottom line??
->>> New powertube oring.
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