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Vacuum gauge shows a low value.  Vacuum regulator out of adjustment. Vacuum system leaking.  Adjust the vacuum regulator. Do a test for leakage. Repair the leak. 
Vacuum gauge shows a high value.  Vacuum regulator out of adjustment. Vacuum inlet filter blocked. Vacuum regulator filter blocked.  Adjust the vacuum regulator. Replace the vacuum inlet filter. Replace the vacuum regulator filter. 

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% Maintenance Practices % 1. General
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% 2. Remove/Install the Vacuum Regulator
% A. Remove the Vacuum Regulator % %
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Detail Steps/Work Items  Key Items/References 
(1)  Disconnect the airplane main battery.  Refer to Section 24-34. 
(2)  Remove the engine cowlings.  Refer to Section 71-11. 
(3)  Clean the area around the regulator outlet. 
(4)  Release the pipe to the vacuum regulator.  At the firewall. Put a cap on the regulator outlet. 
(5)  Remove the instrument panel cover.  Refer to Section 25-10. 
(6)  Release the flexible hose from the vacuum regulator.  Refer to Figure 2. Put a cap on the regulator inlet. Put caps on the hose ends. 
(7)  Remove the nut that attaches the regulator to the firewall.  In the engine compartment. 
(8)  Remove the regulator from the airplane. 

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% B. Install the Vacuum Regulator %

Detail Steps/Work Items  Key Items/References 
(1)  Put the regulator in position on the firewall.  On the aft face of the firewall. 
(2)  Install the nut that attaches the regulator to the firewall.  In the engine compartment. 
(3)  Connect the pipe from the pump to the regulator. 
(4)  Connect the flexible hose from the directional gyro to the vacuum regulator.  On the aft face of the firewall. 
(5)  Connect the airplane main battery.  Refer to Section 24-34. 
(6)  Install the engine cowlings.  Refer to Section 71-11. 
(7)  Do an engine idle run. Check suction gauge.  The gauge should indicate 4.7 ± 0.1 inHg. If necessary, adjust the system. 
(8)  Install the instrument panel cover.  Refer to Section 25-10. 

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% 3. Replace the Vacuum System Air Filter %
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Detail Steps/Work Items  Key Items/References 
(1)  Remove the instrument panel cover.  Refer to Section 25-10. 
(2)  Release the flexible hose from the filter.  Refer to Figure 2. 
(3)  Remove the nut and washer that attach the filter to the instrument panel floor. 
(4)  Remove the filter. 
(5)  Put the new filter in position on the instrument panel floor. 
(6)  Install the washer and nut that attach the filter. 
(7)  Connect the flexible hose to the filter. 
(8)  Do an engine idle run. Check suction gauge.  The gauge should indicate 4.7 ± 0.1 inHg. If necessary, adjust the system. 
　
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