Pneumatic Circuit System Problems Repair and Troubleshooting
5 - 40 046-001141-00 A5/A3™ Service Manual
FIGURE 5-35
14. Compress the negative pressure ball to bleed the air inside.
FIGURE 5-36
15. Release the negative pressure ball. If the negative pressure ball is fully expanded within 30
seconds, it indicates that the back pressure regulator leaks.
16. Pull out No.27, 28 and 29 PU tubes which connect the flow sensor to the gas mixer. Disconnect
at the gas mixer end.
17. Occlude the pulled-out tube end on the gas mixer by using three 3126-06-00 tube plugs.
18. Disconnect tube 58 and plug out its end connecting the back pressure valve. Connect the
negative pressure ball to the pulled-out end of tube 58 through “3106-06-08 adapter
connector”.
19. Flatten the negative pressure ball to remove the gas inside.
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