ACS 653, ACS 663 Service Manual
SP00D00624 2021-04-08 Robert Bosch GmbH
88
Plumbing and Mechanical
These instructions outline the steps to replace
the existing vacuum pump. See Figures 4-2
and 4-3.
1. Clear service hoses and remove them.
2. Disconnect unit from the power source.
3. Remove the front plastic cover.
4. Open the service rear door.
5. Remove the two plastic lines from the
vacuum pump.
6. Remove the four bolts fastening the vacuum
pump to the pump shelf.
7. Disconnect the vacuum PUMP connector
from the main harness.
8. Remove the vacuum pump from the unit.
1. Place the vacuum pump into the unit.
2. Secure the vacuum pump to the unit with
four screws.
3. Connect the electrical connector (PUMP)
from the vacuum pump to the main harness.
4. Connect the two plastic lines.
5. Remove the cap from the vacuum pump
oil ll port.
6. Add 580 ml of oil into the vacuum pump.
7. Place the cap on the ll port.
8. Close the service rear door.
9. Reinstall the plastic frontal cover.
10. Attach the outside high- (red) and low-side
(blue) service hoses. Tighten at 7.9 Nm
torque.
11. Perform the steps to start the pump.
12. While the vacuum pump is running, check
the correct ll level through the sight glass.
13. Perform a function test and check for leaks.
ss01940
Oil ll port
Oil drain
port
Sight
glass
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