A7â„¢ Service Manual 046-006272-00 5 - 31
Repair and Troubleshooting Pneumatic Circuit System Problems
Turn the knob clockwise until the bottom surface of the pressure head is in contact with the top
surface of the connector, as shown below.
FIGURE 5-18
5.3.1.4 Precautions for Use of Negative Pressure Ball
Besides one sealing cover, the negative pressure ball also has two one-way valves at its front end, as
shown below. The built-in one is connected with the gas inlet of the ball which permits the gas come
in only, and the exterior one only permits the gas come out. If the front sealing cover is removed or
loosened, the sealing performance of the negative pressure ball will compromise. In this case, you
need to tighten the sealing cover.
FIGURE 5-19
When the negative pressure ball is connected with the tested component, the ball permits the gas in
only, but meanwhile it’s free to release air when it’s pressed.
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