Safety and operating instructions
56 © Construction Tools GmbH | 33905146 01 | 2019-09-05
Original Instructions
7.11 HP-accumulator
Accumulators are pressure containers in the context of
the European Pressure Equipment Directive 2014/68/
EU.
As safety−related components, high pressure accumula-
tors are subject to special safety regulations.
Overhauling high pressure accumulators is only permit-
ted if carried out by professionals. Professionals are
people who are authorised to overhaul high pressure ac-
cumulators according to national regulations.
Contact the Epiroc Customer Center / Dealer in your
area for a professional.
A. Lower shell
B. Upper shell
C. Fastening screws
D. Connecting screws
WARNING Component coming loose abruptly
The HP-accumulator is under pressure, even when the
hydraulic system has been depressurised. Screw con-
nections and parts of the HP-accumulator might come
loose abruptly and cause injuries.
u Never unscrew the cover or the upper shell from a
pressurised HP-accumulator.
u Have the HP-accumulator checked in accordance
with the national / regional safety provisions.
7.11.1 Visual check
Once a week carry out a visual check of the HP-accumu-
lator.
In case of damages, safe, trouble-free operation is en-
sured only if the complete HP-accumulator is replaced.
n
Immediately replace the complete HP-accumulator if
you detect:
–
cracks/fissures,
–
distortion/deformation,
–
corrosion,
–
thread damage to the threaded bores.
n
If broken or missing connecting screws are detected
the HP-accumulator shells needs to be checked for
cracks, deformations and damage to the threaded
bores by a professional. All connecting screws must
be replaced.
n
Never operate the hydraulic breaker if you detect any
damage to the HP-accumulator.
The HP-accumulator can be replaced on site. Contact
the Epiroc Customer Center / Dealer in your area.
7.11.2 Checking the fastening screws
Once a week, check that the HP-accumulator fastening
screws are tight.
n
Check that the fastening screws(C) are tight.
n
Tighten any loose fastening screws to the right tight-
ening torques (see chapter Bolt connections /
Tightening torques).
n
If any of the HP-accumulator fastening screws are
broken, replace all fastening screws.
7.11.3 Checking the gas pressure
After the first installation of the hydraulic breaker, the
gas pressure of the HP-accumulator must be checked at
least once during the first week.
If no loss of gas is found, the second check is to be car-
ried out after three months.
If no change in gas pressure is found at that stage, then
testing can be performed annually.
Further checks, e.g. prior to installation and regular
checks, are to be carried out in accordance with national
regulations.
The gas pressure changes with the gas temperature.
Before checking the gas pressure it is necessary to wait
until the temperature of the HP-accumulator has levelled
to about 20°C (68°F).
The gas pressure can be checked by measuring the ve-
locity of the pressure drop in the hydraulic system. Use a
pressure gauge (measuring range ≥ 250bar (3625psi)).
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