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The hydraulic system is considered to be
the "blond circulation" of a concrete pump. It ensures
reliable and metered movements of the transfer tube, mixer shaft
and placing boom. For this, the oil is "chased" partly
by hydraulic pumps with a pressure of up to 350 bar through valves
and lines so as the high forces are transferred and the control
commands are carried out sensitively. Disorders in the hydraulic
system lead to error functions and usually the complete breakdown
of the machine.
![[ölfilter]](/images/products/aps/hfilter.jpg)
Original (left) and copy
The main cause of these breakdowns are defective
valves or in extreme cases also the breakdown of a hydraulic pump.
These failures are almost always due to dirt in the hydraulic oil.
To avoid this dirt, the hydraulic filter is an essential part of
the oil circuit.
This part which is actually very reasonably priced,
has a decisive influence on the function, operating safety and the
wear costs of the concrete pump. By keeping the hydraulic oil
clean, the filter protects the expensive components in the
hydraulic system from damage and breakdown. The following
comparison drawn up by our filter supplier - made between the
original PM hydraulic filter and a somewhat cheaper copy filter of
a "pirate" - has therefore set us thinking. Is the
supposed price advantage really that what it makes out to be? We
would like so show again this filter comparison - slightly
abbreviated due to space.
| Product: |
Original filter - PM |
Copy |
| Degree of fineness of the filter paper: |
120 micrometre |
120 micrometre |
| Length: |
296 mm |
302 mm |
| Adhesive: |
2-component adhesive |
1-component adhesive |
| Ring material: |
tin-plate steel |
chromatic steel |
| External diameter: |
72 mm |
71 mm |
| Height: |
7 mm |
7.5 mm |
| Exterior coat: |
tin-plate steel |
chromatic steel |
| Thickness: |
0.3 mm |
0.5 mm |
| Welding: |
roll-welding |
spot-welding |
| Filter cloth: |
special steel |
MS-cloth |
This comparison shows us what many conclusions can
be drawn here with regard to the quality and service life of the
fabrication:
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The copy filter is not made of special steel.
It contains nonferrous fabric.
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The folds in the performed plate of the
original are supported - this is not the case with the copy.
This means that the filter surface of the copy is not fully at
disposal and this reduces service life considerably.
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Due to the irregular dimension, especially the
construction length of the copy filter which is too long, the
element or the locking valve can be damaged and the filter
function impaired.
Incidentally, it is not a shame that comparative
advertising where one can name names is forbidden in Germany? Just
as Putzmeister has to daily face up to price competition in the
market, we would also like to face quality competition.
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