SHOP MANUAL
Ch 5 page 60
HYDRAULIC SYSTEM
Operating Instructions
Only fluids in Group 2 as defined by the Pressure Equipment
Directive 97/23/EC are permitted for use in A and AP Series accumulators – see Piston Accumulator Operating
Instructions, bulletin 1240-T1.
Before installation, refer to the pressure and temperature limits shown on the nameplate.
For cyclic loading, consult Parker regarding the fatigue-free working pressure range or limiting of the number of
cycles for finite life applications.
Maintenance
Accumulators must be regularly examined, checked for general condition, and maintained on a periodic basis.
The frequency and extent of inspection required will depend on experience with the particular application. It is
the responsibility of the accumulator installer to set the frequency of maintenance appropriate to the application,
but a period of one year between inspections is considered to be an acceptable maximum.
In the case of finite life applications, Parker recommends inspection of the accumulator when one half of the al-
lowable load cycles has been completed or after a period of one year – whichever occurs first.
If the user is not competent to make the necessary assessment of reliability, then expert advice must be ob-
tained. Examination shall consist of visual inspection of the physical integrity of the equipment and, where ap-
plicable, a functional test.
Maintenance routines shall be performed by authorised personnel only and shall include the verification of set-
tings and operational testing where applicable.
Maintenance shall also include routine testing of individual devices after specified service cycles and the ex-
change of components before the end of the projected lifetime.
Maintenance programs and work, results of examinations and any resulting remedial measures taken shall be
documented and retained for 10 years or the lifetime of the installation (if shorter). Replacement of components
shall be documented and retained in the same way.
Repair Kits are available for all accumulator models; replacement of the piston seals is generally the only main-
tenance required.
When ordering repair kits, state the complete model number from the nameplate and specify the type of fluid
and operating temperature. Replacement of other seals on end caps and the gas valve is also recommended
(for A Series kit numbers, see page 4; for AP Series kit numbers, see page 6).
Periodic checking of the pre-charge pressure, see page 8, will provide early warning of deteriorating piston seal
performance.
If pre-charge pressure is low, check also for gas valve and/or end cap seal leakage. Allowing for temperature
difference, if any, the pre-charge pressure will rise if oil collects in the gas side and will fall if gas leaks into the
oil side or past gas end cap seals. It is suggested that a check be made a week after installation, and thereafter
once every three months or at intervals determined by the system builder.
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