jcb JS300 Service Manual page 25

Some hydraulic circuits and valve blocks are fitted with gas
hydraulic bladder type accumulators.
Before removing accumulators make sure hydraulic
pressure is vented.
Pressure ( T 1-15)
Even when the hydraulic pressure is vented the
accumulator still contains pressurised nitrogen gas. DO
NOT attempt to discharge the gas pressure.
DO NOT transport accumulators charged with pressurised
gas by air freight.
Replacement
Replacement accumulators are generally supplied in a
discharged state with no nitrogen gas. A label attached to
the accumulator indicates the gas charge state.
Charging
K Fig 1. ( T 1-20)
Important: The following charging procedure is only
applicable to accumulators supplied in a discharged state.
To carry out the charging procedure the following is
required:
– Pressurised bottle of nitrogen gas with a suitable
pressure reducing valve (3).
– Correct gas bottle adaptor depending on territory.
– Charging kit 892/00239. Refer to Section 1.
Operating charge pressures; accumulators are charged
to different operating pressures depending on the
application. For the correct charge pressure refer to the
applicable system specifications.
Before fitting a replacement accumulator charge it with
nitrogen gas as follows:
1-20
Gas Hydraulic Bladder Accumulators
K Venting
the Hydraulic
Section 1 - General Information
Gas Hydraulic Bladder Accumulators
Use only nitrogen gas to charge accumulators. The
use of any other gas can cause the accumulators to
explode. Remember that although nitrogen is not
poisonous you can be killed by suffocation if it
displaces the air in your workplace. Do not allow
excessive quantities of nitrogen to be discharged into
the atmosphere.
B-3-1-6
1
8
7
6
1 Hold the accumulator upright and remove the plastic
cap from the top of the accumulator.
Note: Some accumulators are supplied with a measured
quantity of oil inside the gas chamber. Take care to prevent
oil loss.
2 Using a suitable allen key, slowly remove the filler
plug 2.
Lightly oil the sealing washer beneath. Replace the
washer and plug. Loosen the plug by 1/8 of a turn.
9813-5100-1
General Procedures
!M
WARNING
2
3
5
Fig 1.
4
C110540-C2
1-20