Removal Of Residual Air And Trial Run; System Check; Maintenance; Preventive Maintenance - Kramp MPP Manuel D'utilisation

4.7.

Removal of residual air and trial run

5
Once the first start-up phase has been properly completed, the system can be brought to the required temperature in order
to remove residual air. This can be done by gradually increasing the rotational speed and the load. Check before the trial run
whether multiple disc brakes or holding brakes, which are controlled by the feeding pressure supply, are functioning properly,
so that action can be taken in the event of an emergency. Gradually increase the load, continually checking the pressure
readings on the manometers. Always keep safety in mind! Finally, check whether the maximum operating pressure complies
with the required or indicated values as the components have been pre-selected for a particular pressure level. Levels in
excess of this pre-selected pressure level may result in serious damage.
4.7.

System check

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Before a new system – particularly a prototype – becomes operational, it is advisable to perform a complete circuit test during
a trial run under circumstances that are comparable to the actual operating circumstances, including the most extreme
situations. This circuit test is necessary in order to be able to
claim a guarantee in the event of system damage and should be carried out by specialised, expert technicians using
electronic measuring equipment. The measured values should be compared to the component data issued by the
manufacturer, particularly the nominal operating pressure, maximum operating pressure, peak pressure, feeding pressure,
oil flow and speed of response of the pump and motor. The system can only be approved and is only eligible for a guarantee
once these data have been measured and printed by a recorder connected to the electronic measuring equipment. If this
procedure is not followed, liability for the system rests entirely with the end user. Guarantee applications are subject to the
binding decision of Kramp Groep B.V., against which no complaints are possible.
5.0

Maintenance

Every machine with a hydraulic system, whether mobile or stationary, is supplied with a user's manual and a CE statement.
Maintenance instructions are important. In order for maintenance to be performed correctly, the end user must know how to
act. The transfer of this knowledge is the task of the machine engineer.
5.1

Preventive maintenance

Regular inspections of the hydraulic system are important economically. Downtime resulting from overdue maintenance will
almost always turn out to be more expensive. Consequently, scheduled inspections must take place at pre-determined times,
after a certain number of running hours, during which key components are checked preventively to avoid costly repair and
downtime. Following the direction of the oil flow (starting with the reservoir) is an effective method to ensure that all
components are inspected.
5.2

Periodic maintenance

The first overhaul should be performed 100 running hours after the system has been put into operation. At the very least,
this overhaul should include replacing the filters and checking the oil. In addition, the entire installation must be inspected
thoroughly. Keep the following points in mind during the inspection:
• After the first overhaul, a major maintenance inspection must be performed after 300 running hours and subsequently
after every 500 running hours, or earlier, depending on the load and the operating conditions. A major maintenance
inspection should be performed at least annually. In the end, the frequency of maintenance inspections is determined by
external influences and the load to which the installation is subjected.
• The filters and oil must always be replaced during a major overhaul. If necessary, oil replacement can be postponed on
the basis of an analysis by a specialist firm. See also section 5.2.1
Moreover, it is essential to follow the points below in order to optimise the maintenance inspection.
5.2.

Reservoir

1
The oil level must be correct and the oil must be of the prescribed quality and viscosity. For larger installations, it may be
advisable to have an oil sample analysed. There are specialised independent firms that can offer advice as to whether the
oil should be replaced or whether it can still be used until the next planned periodic overhaul. These firms examine such
properties as acidity, viscosity and degree of contamination. If you wish to avoid commissioning an expensive analysis, visual
inspection is also possible, albeit highly unreliable. Rough conclusions can be drawn about the condition of the oil based on
smell (sour or burnt), colour (yellow or milky) and degree of contamination.
Always use the same brand and quality of oil for replenishing and changing. Different brands and qualities should never be
mixed without written permission from the oil supplier.
5.2.

Suction pipe

2
The suction pipe should be inspected for damage and any protruding parts of the steel braid reinforcement of the tube. Screw
couplings must be checked for leakage and tightened if necessary. Particular attention should be paid to plastic and rubber
tubes without steel braid reinforcement as these are subject to deformation resulting from high oil temperatures and the
suction force of the pump, which can restrict the passage to the pump.
5.2.

Pumps

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UK
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