Bosch ACS 653 Repair Instruction page 88

Plumbing and Mechanical
Replacement Vacuum Pump
WARNING: Disconnect the unit from
the power source before beginning
service work. Incorrect use or
connections can cause electrical
shock.
WARNING: Wear safety goggles
when working with refrigerants.
Refrigerants can cause eye injury.
WARNING: Use extreme caution
w h e n d i s c o n n e c t i n g h o s e s .
Pressurized refrigerant may be
present in hoses. Point hoses away
from you and anyone nearby.
Instructions
These instructions outline the steps to replace
the existing vacuum pump. See Figures 4-2
and 4-3.
Removing Vacuum Pump
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.
SP00D00624 2021-04-08
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Oil fill port
Figure 4-2. Vacuum Pump
ACS 653, ACS 663 Service Manual
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.
Installing Replacement Vacuum Pump
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 fill port.
6. Add 580 ml of oil into the vacuum pump.
7. Place the cap on the fill 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 fill level through the sight glass.
13. Perform a function test and check for leaks.
Oil drain
port
88
Sight
glass
Robert Bosch GmbH