Tubes And Pipes; Filters; Cooler; Intermediate And Built-In Valves - Kramp MPP Manuel D'utilisation

The pump must be checked for leakage along the pump shaft and external leakage near regulators, covers and mounted
pipes. Pay particular attention to nearby oil traces, such as oil splashes on the floor or chassis components. Check the drive
clutch for damage to the plastic stars, play on the detachable bearings or universal joint shafts, correct vee belt tension, etc.
The various circuits on the pressurised side should be checked separately, following the direction of the oil flow. Also pay
attention to leakage near screw couplings and changes in noise levels (possibly caused by bearings).
5.2.

Tubes and pipes

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Inspect the pipework for leakage and damage. Check if pipe brackets are attached properly or show any fractures. Also look
for any wear of the pipes near brackets and ensure that the location of the pipes is such that they are not obstructed. Check
the tubes thoroughly for deformation, damage and corrosion. After six years, rubber and plastic tubes should be replaced by
similar tubes (recommendation no. 1/74 of the Association of Industrial Accident Insurers; in accordance with DIN-20066).
Unassembled tubes in stock may be used for four years after the date of manufacture, assembled tubes for only two years.
Use of the wrong tubes or tubes that are too old may result in life-threatening situations and substantial environmental and
mechanical damage.
5.2.

Filters

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If indicators have been installed, filters can be checked for impurities quite simply. If no indicators have been installed, the
filters can be inspected visually. The condition of certain components can then be ascertained, if necessary after obtaining
expert advice. Filters should always be replaced when the oil is replaced. Keep filter fineness in mind when doing so. Also
perform regular checks of the ventilation filters on the reservoir in connection with underpressure or overpressure in the
tank.
5.2.

Cooler

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Perform regular checks of the cooler radiator for impurities in connection with decreasing cooling capacity. A cooler
containing compressed air must be cleaned against the direction of air flow. Never use steam cleaners as they will damage
the system. In principle, heat exchangers are maintenance free if the cooling medium is cooling fluid. Replace the cooling
fluid in accordance with the supplier's instructions. Never mix cooling fluids of different brands or compositions without
permission from the supplier. If tap water or groundwater is used as a cooling medium, the cooler must be checked regularly
for calcium or manganese deposits, etc. Internal contamination causes sharp decreases in cooling capacity.
5.2. Intermediate and built-on valves
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Intermediate and built-on valves, such as balancing valves, cross-over valves, controlled non-return valves, etc., should be
visually checked for leakage and damage. When in doubt, disassemble, check and, if necessary, replace these valves. There
should be no load on built-on valves (oil pressure or external load). Look out for unmanageable situations!
5.2.

Cylinders

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Cylinders must be inspected for leakage along the gasket(s) near the shaft. If necessary, gaskets should be replaced
preventively. Also look for damage to the shaft (scratches and wear). When in doubt, consult with an expert about the
appropriate course of action. Also inspect the attachment of the cylinder, particularly at damaged hinge loops and ball heads.
Check the connection between the tubes and the cylinder, paying particular attention to wear and to whether the connections
are without tension. There should be no load on built on cylinders. Pay attention to controlled non-return valves and balancing
valves and lock the mechanical part to avoid unmanageable situations.
5.2.

Gearboxes

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Perform regular checks of the oil level using a gauge glass or sounding rod. Oil in gear boxes should be replaced with the
same frequency as hydraulic oil. Let the oil flow out when it is warm, keeping multiple drainage points, if any, in mind. Also
check whether the de-aeration filter, which is mounted standard to the gearbox, is open. Clean it with cleaning fluid if
necessary. Always use the same brand and quality of oil when filling or replacing oil. Never mix different brands or
compositions without permission from the oil supplier.
5.2.

Accumulators

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When in doubt, the nitrogen pressure can be checked using special equipment. A number of safety rules must be observed
before starting work on an accumulator. The accumulator must be completely depressurised on the oil side. Open the
short-circuit tap so that pressure can flow off to the tank. A short-circuit tap is compulsory! Never refill an accumulator with
oxygen or compressed air as this creates a risk of explosion! Instead, accumulators should only be refilled with nitrogen.
Never fill accumulators in excess of the maximum permitted filling pressure, which should be stamped on the accumulator,
together with the maximum permitted operating pressure. Exceeding either of these two values creates a risk of explosion.
5.3.

Planning

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Plan preventive maintenance inspections well in advance, in consultation with suppliers if necessary. Ensure that the
inspection is performed by expert personnel or commission temporary personnel when in doubt. Try to take account of
seasonal variations, peak pressure, weekends and holidays. Also keep in mind that crucial components must be in stock.
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