Pneumatic Circuit System Problems Repair and Troubleshooting
5 - 44 046-001141-00 A5/A3â„¢ Service Manual
FIGURE 5-43
28. Release the negative pressure ball. If the negative pressure ball is fully expanded within 30
seconds, it indicates that the needle valve leaks.
5.3.3.3 Leak Test of the System Switch Assembly
Perform a leak test of the system switch assembly by using the following tools:
• Negative pressure ball (quantity:1)
• 3106-06-00 adapter connector (quantity:1)
• 3106-06-08 adapter connector (quantity:1)
• 3126-08-00 tube plug (quantity:1)
• PU tube (6X100) (quantity:1)
Test procedures:
1. Turn off the pipeline gas supplies and turn on the system switch. Bleed the residual pressure by
opening the flow regulators.
2. Pull out No.45 which connects the system switch assembly to the flow regulator. Disconnect at
the flow regulator end and connect the pulled-out tube end to the negative ball through one
3106-06-00 adapter connector.
3. Pull out No.43 which connects the system switch assembly to the Y piece. Disconnect at the Y
piece end and occlude the pulled-out tube end through one 3106-06-08 adapter connector
and one 3126-08-00 tube plug.
4. Flatten the negative pressure ball to remove the gas inside.
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