KCP Heavy Industries Co., Ltd. Maintenance
7-11
7.6.1 Checking the accumulator
This maintenance describes how to check the accumulator pre-charge pressure. You should take
notice of any requirements valid in the country of use or specified by the operator.
Danger of explosion ______________________________________________________
Use only Nitrogen (N2) to fill the accumulator. There is a danger of explosion if
compressed air, oxygen or similar gasses are used.
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► You should set the accumulator pre-charge pressure to 90 bar. Only use Nitrogen
(N2) to fill the accumulator.
Note ___________________________________________________________________
Check the accumulator pre-charge pressure once the hydraulic fluid has warmed up to its
operating temperature (40°C to 65°C).
The actual valve you measure may not be more than 15% less than the pre-charge
pressure specified.
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► Load the accumulator with hydraulic fluid until the maximum pressure (190bar to
200 bar) is shown on the pressure gauge.
► Open the accumulator dump valve a little and release the accumulator pressure
slowly.
► Observe the pressure gauge and read off the accumulator pre-charge pressure.
► You must have the accumulator topped up if the actual value is 15% or more below
the set point value.
Note ___________________________________________________________________
You can observe the indicator on the pressure gauge slowly going down as you slowly
release the accumulator pressure.
The pressure gauge reading suddenly falls as soon as the actual accumulator pre-charge
pressure is reached, i.e. the value immediately before this point is accumulator pre-charge
pressure.
You must have the accumulator topped up if the actual value is 15% or more below the set
point value.
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