ACS 553, ACS 563 Service Manual
1 689 975 295
2021-04-13
Robert Bosch GmbH
41
Diagnostics and Testing
Stuck In Clearing
NOTE:
The recover process begins with
low-side clearing. Low-side clearing activates
the compressor only and runs until the
accumulator transducer reads -0.45 bar
(13 in HG) plus 15 seconds. The unit will then
go into the first stage of recovery. There is no
high-side clearing in these units. If a unit gets
stuck in the clearing process, use the following
procedure to troubleshoot this condition.
1. Attach a calibrated gauge to the accumulator
test port on the side of the manifold.
2. Disconnect the fan by unplugging it at the
power board. Do this with the machine
disconnected from its power source.
3. Turn on the display pressures feature
(“display title info” available in maintenance
menu) so the transducer readings are
displayed on the screen while operating
the machine.
4. Verify the problem by attempting to recover
the hoses or a test tank.
NOTE:
There must be pressure in the unit to
verify stuck in clearing.
5. Verify the transducers are the correct
pressure rating and wired correctly.
6. Verify all lines going to and from the
compressor are tight and leak free. Retest
if any loose/leaking lines are found.
7. Close the valve on the source tank if
attached and valve is open, and retest. If the
unit completes clearing, replace the recover
solenoid and retest.
8.
Verify the accumulator test gauge and
transducer readings match. If the test gauge
shows the vacuum level in the accumulator is
below the minimum level and the transducer
reading doesn’t match (the accumulator
transducer reading and the calibrated test
gauge reading should match), replace the
accumulator transducer and retest.
9. Check Tank Liquid solenoid (S7) for debris.
10. Verify the oil drain solenoid isn’t leaking
the vacuum. Place a finger over the end of
the oil drain tube and check for suction. If
a suction is detected, replace the oil drain
solenoid. Retest.
11. Disconnect the manifold end of the
compressor oil return line and check
for pressure coming from the manifold
(with compressor running). If pressure is
detected at the compressor oil return line
connection on the manifold, replace the
compressor oil return solenoid. Retest.
12.
Verify the accumulator/oil separator bowl is
tight. Tighten and retest if loose.
13. Verify the compressor oil separator bowl is
tight and the O-ring is installed.
• If the compressor oil separator bowl is
loose, retighten and retest.
• If the O-ring is missing, install a new
O-ring, reassemble, and retest.
14.
Reinstall the compressor oil separator bowl;
do not reinstall the system oil separator
bowl.
15. Access the service menu and select the
Output Test option.
16. Scroll to the
Compressor
and turn it on.
Once the compressor is running check
the compressor oil separator thread for
leakage with a soapy water solution or other
leak detection fluid. Remove the leaking
component and verify the O-rings are in
place and not cut or damaged. The O-rings
and mating parts should be lubricated prior
to assembly. Repair any leaks found and
retest.
NOTE:
Limit the amount of time the compressor
is running, as it will be pulling in air and adding
it to the ISV. Be sure to purge the air from the
ISV once the machine is repaired.
17. If the unit doesn’t complete clearing, test the
compressor as reccomended procedure.
Refer to
Compressor Troubleshooting
in the
Compressor section of this manual.
