Safety and operating instructions
© Construction Tools GmbH | 3390 5203 01 | 2019-08-06
Original Instructions
41
7.2 Depressurising the hydraulic
system
Even when you have switched off the carrier, a consider-
able residual pressure can still be present in the hy-
draulic system.
A residual pressure can still be present in the hydraulic
breaker even after you have disconnected the quick-re-
lease 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 ac-
cumulator, 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 de-
pressurise the hydraulic system.
Case 1: If measurement connections are present in the
supply pipe to the hydraulic breaker, with which the de-
pressurised 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 hy-
draulic 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 mea-
surement connection in the supply pipe to the hy-
draulic breaker.
4.
If residual pressure is still present, wait until the pres-
sure 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 cou-
plings, 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 inter-
mediate valve connection, you must observe the follow-
ing 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 hy-
draulic 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 cou-
plings, 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 re-
turn pipe, you must observe the following steps in order
to depressurise the hydraulic breaker:
1.
The hydraulic breaker must be connected to the hy-
draulic 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 at-
tachment.
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
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