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Catalogue HY10-4012-INST/EU
GB
Dismantling/Reassembly
You are on the point of intervening on an accumulator designed to
contain fluids under pressure. Make sure that the accumulator is
compliant with the rules existing in the country of use and that you
have the following elements:
• documents delivered with the accumulator
• equipment necessary for the maintenance of accumulators,
• new repair kit adapted to the accumulator
In case of difficulty, immediately contact Parker. Any improvised action
can be the source of a potential danger. The equipment must only be
commissioned by qualified technicians (contact Parker or its approved
network).
DiSMantLinG oF aCCuMuLatoRS
Before removing the hydraulic system, the hydraulic pressure
must be imperatively released from the system. Make sure that there
is no residual hydraulic pressure in the accumulator.
A. Isolate the accumulator and depressurize the hydraulic system
using the Parker Olaer DI depressurizing or isolating block or
depressurize the hydraulic system.
B. Remove the accumulator and fix it horizontally in a vice or another
securing device. Protect the shell so as not to damage it. Delimit a
security area outside the alignment of openings.
C. Unscrew the guard cap from the charging valve (photo 1).
D. Unscrew the charging valve plug (photo 2).
E. Block the hydraulic opening before complete discharge to avoid any
risk of projection of liquid during the opening of the valve at the end of
the discharge.
F. Discharge the gas contained in the bladder using a charging and
gauge assembly until 0 is shown in the manometer (photo 3).
G. Make sure that the bladder is not charged with nitrogen by checking
that the valve is open.(see diagram 1)
iMPoRtant !
If the bladder remains in contact with the
valve see diagram (see diagram 2), it means
that there is residual pressure. In this case:
• stop all operation
• secure the area
• contact PARKER immediately
H. Remove the single piece charging valve (photo 4) or the integrated
valve mechanism or the valve core (photo 5) according to the models.
I. Remove the lock nut from the valve body and the name plate (photo 6).
By pressing on the valve body, manually push back the bladder inside
the body. There must be no resistance.
IMPORTANT !
If it is not possible to push back the bladder inside, it means that
there is residual pressure. In this case:
• stop all operation
• secure the area
• contact PARKER immediately
J. According to the model, remove the hydraulic vent screw and its
seal (photo 7).
K. Loosen the lock nut (photo 8).
L. Manually push the fluid port body in the accumulator shell to release
the spacer, O-ring and the washer (photo 9).
M. Release the rubber split ring from the fluid port body. Carefully fold
it to remove it from the accumulator shell (photo 10).
N. Remove the fluid port (photo 11).
O. Remove the bladder complete with its charging valve body through
the fluid port opening, taking care not to damage it (photo 12).
Maintenance / Installation
EHV
CLEaninG anD inSPECtion
Carefully clean all the metallic parts of the accumulator with an organic
solvent.
Visually check the condition of the components installed inside the fluid port
(poppet, spring, nut and dash pot). Push the poppet head to check that it
slides freely. Clean the bladder with a fluid compatible with the type of
rubber, (for example, isopropyl alcohol).
Check that the surface of the bladder is not damaged.
Check that there is no corrosion, or foreign bodies inside the accumulator
shell.
If the inside of the accumulator shell is protected, check the condition of the
protection. For any statutory inspection, refer to the existing regulations.
Replace all parts considered to be defective. The seals must be replaced
(see exploded view photo).
REaSSEMBLY oF aCCuMuLatoRS
P. Squeeze the bladder to discharge the air from it (photo 13).
Q. Lubricate the inside of the shell copiously by turning it around its axis.
Use either the medium used in the circuit or a similar liquid (approximately
10% of the accumulator volume for capacities up to 5 liters or 5% for higher
capacities). If the liquid is low in viscosity (lower than 5 cSt), consult
PARKER.
R. Lubricate the bladder and insert it into the accumulator shell.
S. Check that the bladder is not folded or twisted. For large capacity
accumulators use appropriate tools (bladder extractor) (photo 14).
T. Reinstall the name plate and the lock nut. Do not tighten the lock nut
(photo 15).
U. Check that the charging valve slides freely. Then insert the fluid port and
the anti extrusion ring in the accumulator shell (photo 16).
V. Install the fluid port assembly on the anti extrusion ring.
W. Install the washer (A), the back up ring (B) and the spacer (C) in that
order (photo 17).
X. Tighten the lock nut and make sure that the components are centered
by striking lightly the fluid port body at various angles using a plastic mallet
(photo 18).
Y. Tighten the lock nut (photo 19).
Z. If the model is eqquiped with the bleeder, carefully reinstall the venting
Drawing 1
Drawing 2
screw and its new gasket, taking care to install it properly (photo 20).
AA. Nitrogen side, screw the valve shell nut in position using the correct
horizontal bars and tighten it (photo 21).
BB. Install the single-piece charging valve, tightening it to a torque of 1.5
mda.N or the integrated valve or the valve body tightening it to a torque of
0.03 mda.N (photo 22).
Immediately after this operation, charge the bladder with nitrogen to a
pressure of 1 to 1.5 bar (with the accumulator in horizontal position: see
table charging process).
For the charging of the accumulator and its putting into service, refer to the
instructions manual.
Finally make sure that the initial safety warnings (name plate, charging
sticker, safety information...) are always legible. If this is not the case
consult Parker.
For reasons of safety it is mandatory to install a reducing valve
between the bottle and the charging and gauge assembly.
Before charging the accumulator with nitrogen, turn the
accumulator shell to lubricate its inner walls evenly.
REMINDER! Use only nitrogen class 2.8 with a purity of
99.8% pure. It is strictly forbidden to use any other gas
except nitrogen to inflate the accumulator. Explosion hazard!
Parker Hannifin
Accumulator and Cooler Division Europe
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