Depressurising the hydraulic
system
Even when you have switched off the carrier, a
considerable residual pressure can still be present
in the hydraulic system.
A residual pressure can still be present in the
hydraulic breaker even after you have disconnected
the quick-release couplings or closed the shut-off
valves.
The hydraulic breaker can only be depressurised
using the hydraulic system of the carrier, by allowing
hydraulic oil to drain to the tank via the return
connection.
If the hydraulic breaker is fitted with a high-pressure
accumulator, it can take longer to relieve the pressure
in the hydraulic system to the tank, since a larger
volume of oil has to be drained away.
Depending on the type of hydraulic breaker, the
internal leaks, the oil temperature, the type of
hydraulic oil and the design of the hydraulic
installation of the carrier, the time required to relieve
the pressure can vary.
Depending on the hydraulic system of the carrier you
will have to consider using various measures in order
to depressurise the hydraulic system.
Case 1:
If measurement connections are present in the supply
pipe to the hydraulic breaker, with which the
depressurised state can be checked using a suitable
gage. In order to depressurise the hydraulic breaker
you must observe the following steps:
1. The hydraulic breaker must be connected to the
hydraulic system of the carrier device, i.e. the
hydraulic hoses must be connected up and the
respective shut-off valves in the supply pipe and
in the connection to the tank must be opened.
2. Depressurise the hydraulic system according to
the manufacturer's safety and operating
instructions for the carrier.
3. Measure the pressure with a suitable gage at a
measurement connection in the supply pipe to
the hydraulic breaker.
4. If residual pressure is still present, wait until the
pressure has been completely relieved.
5. When you have made sure that no more pressure
is present in the hydraulic system, you must
disconnect the hydraulic connection to the carrier.
Close the shut-off valves or disconnect the
quick-release couplings, so that no hydraulic oil
can flow back from the carrier.
Case 2:
If no facility for measuring the pressure is present in
the supply pipe to the hydraulic breaker and the
return pipe is connected to the tank without an
intermediate valve connection, you must observe the
following steps in order to depressurise the hydraulic
breaker:
1. Ensure that the hydraulic oil in the hydraulic
breaker and in the carrier has a temperature of
at least 0 °C. If necessary, pre-heat it to at least
0 °C.
2. The hydraulic breaker must be connected to the
hydraulic system of the carrier, i.e. the hydraulic
hoses must be connected up and the respective
shut-off valves in the supply pipe and in the
connection to the tank must be opened.
3. Depressurise the hydraulic system according to
the manufacturer's safety and operating
instructions for the carrier.
4. You must wait at least another 30 minutes until
the pressure has been relieved through leakages.
Only after this period of time will there be no more
residual pressure present in the hydraulic system of
the hydraulic breaker.
5. When you have made sure that no more pressure
is present in the hydraulic system, you must
disconnect the hydraulic connection to the carrier.
Close the shut-off valves or disconnect the
quick-release couplings, so that no hydraulic oil
can flow back from the carrier.
Case 3:
If no facility for measuring the pressure is present in
the supply pipe to the hydraulic breaker and the
return pipe is connected to the tank via intermediate
valves, which for example close off or pressurise the
return pipe, you must observe the following steps in
order to depressurise the hydraulic breaker:
1. The hydraulic breaker must be connected to the
hydraulic system of the carrier, i.e. the hydraulic
hoses must be connected up and the respective
shut-off valves in the supply pipe and in the
connection to the tank must be opened.
2. Depressurise the hydraulic system according to
the safety and operating instructions from the
carrier manufacturer, and where appropriate,
those of the manufacturer of the hydraulic
installation for the attachment.
3. When you have made sure that no more pressure
is present in the hydraulic system, you must
disconnect the hydraulic connection to the carrier
device. Close the shut-off valves or disconnect
the quick-release couplings, so that no hydraulic
oil can flow back from the carrier.
43© 2012 Atlas Copco Construction Tools GmbH | No. 3390 5005 01 | 2012-05-03
Original instructions
MAINTENANCEHB 5800, 5800 DP, 7000, 7000 DP, 10000 DP
To Next Page
Loading...
Need help?
General
