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Maintenance Summary - 2.000 Operating hours
CM060
- Check pre-pressure of pressure accumulators
Orientation
Requirement
Procedure
Maintenance Instructions
MS24-6
DIM123EN - 26.04.2022
Carrying out the maintenance activities described below requires
special knowledge. For this reason, these maintenance activities
must be carried out only by authorized personnel of the
manufacturer!
The activities described here are only permitted to be carried out
after training or instruction by the manufacturer of the pressure
accumulator.
A pressure accumulator consists of two chambers, a liquid and a gas section with a
membrane as a separator. The liquid section is connected to the hydraulic circuit, so
that the bubble reservoir is filled when the pressure rises, thereby compressing the
gas. When the pressure drops, the compressed gas expands and displaces the
stored pressurized liquid into the circulation. This ensures that the pressure level is
maintained during load changes or temporary higher loads.
Screws on the hydraulic system, the connected components, and the
supply lines must be tightened to the manufacturer's specified
torques.
If there are ambiguities regarding the pressure values, be sure to
consult the fluid diagrams included in the machine documentation/
documentation CD.
The values for pressure accumulator pre-tension of each machine
type
are:
1
-
MS16-6, MS22-6, MS22-8, MS24-6 68 bar
-
MS32-6.2, MS32-6.3, MS40-6, MS40-8, MS52-6.3 68 bar
The pressures of the accumulator pre-tension is indicated on a
1)
label on the pressure accumulators.
1. Check the pressure accumulator. While the machine is switched on (not during
a program or continuous run), press the emergency stop switch, while watching
the system pressure gauge. The indication on the pressure gauge should drop
noticeably within a few seconds. From a certain value (see info – Pretension
pressures), the pressure drops rapidly to 0 bar. It is assumed that the
accumulator pre-tension, the accumulator membrane, the gas fill, and thus the
entire pressure accumulator are in order. If the pressure continuously drops to 0
bar within a few seconds without any clearly visible delay in the area of the pre-
tension pressure, the bubble reservoir is defective and the pressure
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