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Rev. 0
Figure 1: Vacuum System Installation Behind The Firewall
DA20-C1 AMM
Vacuum
Doc # DA201-C1
Rev. 0 37-10-00 Page 101
19 Dec 1997
TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the vacuum system.
Complaint Possible Cause Remedy
Vacuum gauge shows no
vacuum. Vacuum operated
instruments do not operate.
Vacuum pump defective.
Vacuum regulator defective.
Vacuum system leaking.
Replace the pump.
Replace the vacuum
regulator.
Do a test for leakage. Repair
the leak.
Vacuum gauge shows no
vacuum. Vacuum operated
instruments operate correctly.
Vacuum gauge defective. Replace the vacuum gauge.
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.
Vacuum
DA20-C1 AMM
Page 102
24 Mar 1999 37-10-00 Doc # DA201-C1
Rev. 1
Figure 2: Vacuum Pump Installation
DA20-C1 AMM
Vacuum
Doc # DA201-C1
Rev. 9 37-10-00 Page 201
29 Apr 2004
MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install components. They also tell you
how to adjust the vacuum regulator. See Chapter 37-00 for the system description. See Chapter
37-20 for the vacuum gauge installation.
2. Remove/Install the Vacuum Pump
A. Remove the Vacuum Pump
Detail Steps/Work Items Key Items
(1) Remove the engine cowlings. Chapter 71-10
(2) Release the pipe to the vacuum pump.
(3) Release 4 nuts and washers which attach
the pump to the engine.
(4) Remove the pump from the engine.
B. Install the Vacuum Pump
CAUTION: DO NOT GET OIL IN THE VACUUM PUMP. OIL CAN CAUSE PUMP
FAILURE
Detail Steps/Work Items Key Items
(1) Put the vacuum pump in position on the
engine.
Use a new gasket.
(2) Install 4 nuts and washers which attach the
pump to the engine.
(3) Connect the pipe to the vacuum pump.
(4) Install the engine cowlings. Chapter 71-10
(5) Do an engine run-up.
− Refer to the DA20-C1 Flight Manual.
Do a test for correct operation of the
vacuum system. If necessary, adjust the
system.
Vacuum
DA20-C1 AMM
Page 202
29 Apr 2004 37-10-00 Doc # DA201-C1
Rev. 9
3. Remove/Install the Vacuum Regulator
A. Remove the Vacuum Regulator
Detail Steps/Work Items Key Items
(1) Disconnect the battery. Refer to Chapter 24-31
(2) Remove the engine cowlings. Refer to Chapter 71-10
(3) Clean the area around the regulator outlet.
(4) Release the pipe to the vacuum regulator.
− Put a cap on the regulator outlet.
At the firewall.
(5) Remove the instrument panel cover. Refer to Chapter 25-10
(6) Release the 2 flexible hoses from the
vacuum regulator.
− Put a cap on the regulator inlet.
− And put caps on the hose ends.
On the aft face of the firewall.
(7) Release the nut which attaches the regulator
to the firewall.
In the engine compartment.
(8) Remove the regulator from the airplane.
B. Install the Vacuum Regulator
Detail Steps/Work Items Key Items
(1) Put the regulator in position on the firewall. On the aft face of the firewall.
(2) Install the nut which attaches the regulator to
the firewall.
In the engine compartment.
(3) Remove the cap from the pipe. Connect the
pipe to the regulator.
In the engine compartment.
(4) Remove the caps from the hoses. Connect
the 2 flexible hoses to the vacuum regulator.
On the aft face of the firewall.
(5) Connect the battery. Refer to Chapter 24-31
(6) Install the engine cowlings. Refer to Chapter 71-10
(7) Do an engine run-up.
− Refer to the DA20-C1 Flight Manual.
Do a test for correct operation of the
vacuum system. If necessary, adjust the
system.
(8) Install the instrument panel cover. Refer to Chapter 25-10
DA20-C1 AMM
Vacuum
Doc # DA201-C1
Rev. 9 37-10-00 Page 203
29 Apr 2004
4. Replace the Vacuum Inlet Filter
Detail Steps/Work Items Key Items
(1) Remove the instrument panel cover. Refer to Chapter 25-10
(2) Release the 2 flexible hoses from the
vacuum filter.
− Put caps on the hose ends.
(3) Release the nut which attaches the filter to
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