Filling The Hydraulic System; Reservoir; Suction Filters; Gear Pumps - Kramp MPP Manuel D'utilisation

4.5

Filling the hydraulic system

A successful start-up phase and trial run is essential for a reliable and problem-free hydraulic system. Components, and
particularly pumps, all too often fail prematurely, sometimes after a few days or even after a few minutes, because the most
basic requirements are not met. Insufficient attention to cleanliness during installation, assembly and start-up is a common
cause of malfunctions. Even the utmost care cannot preclude contamination in a new system. Moreover, the moving parts of
the machine will release particles during the start-up phase. For this reason, it is essential to allow the system to filter out all
the particles before running to the full.
UK
4.5.

Reservoir

1
Check the reservoir for impurities before filling it. Fill the reservoir to the maximum level with clean oil of the right kind,
using a good filling device. The filling device must be fitted with a filter of at least 10 micron absolute. The suction pipe of the
filling device may not reach down to the bottom of the drum, so that any water or large impurities present remain behind in
the drum. If it is impossible to use a good filling device, use clean pitchers or funnels to fill the tank through the return filter.
4.5.

Suction filters

2
If spin-on filters are mounted, these should be completely filled. Remove all air before replacing the element. Subsequently
de-aerate the filter housing. Check for any leakage and determine whether the filter has been assembled correctly.
4.5.

Gear pumps

3
Gear pumps generally do not require additional inspection. However, de-aerate the suction pipe if the pump is located outside
the tank or fill it with oil if the pump is located above the oil level. Always check each connection for leakage and restrictions
(closing devices).
4.5.

Plunger pumps and vane-cell pumps

4
De-aerate the suction pipe of the pump at the highest point. Check the suction pipe for leakage and restrictions (closing
devices and closed suction filters). Fill the pump housing with clean, filtered oil at the highest connection for leak-off oil.
4.5.

Cylinders

5
Cylinders, particularly large cylinders, can be filled with oil in advance. The main advantage are that the oil level in the tank
does not drop too much when the system is put into operation and the amount of air entering the system is minimised.
4.5.

Gearboxes

6
Gearboxes, planetary boxes, wheel axles, etc., are always supplied without oil and should be filled with the oil type specified
by the manufacturer and in accordance with instructions. Also pay attention to temperature stress in connection with the
possible use of cooling systems..
4.6

Deploying the open-circuit system

4.6. Electrical
1
A number of conditions must be met for both stationary and mobile applications:
• When using electrical circuits, these must be designed correctly and meet all applicable safety requirements.
• Low voltage current must be stable; any deviations may not exceed +/-10% for on off magnets and +/-5% for proportional
magnets.
• Ensure that sufficient power can be supplied if the low-voltage circuit is large in size. Take into account any peripheral
equipment that has already been installed, such as cooling devices, parameter monitoring or security devices, lighting,
etc.
• Ensure that the electrical circuit as a whole is sufficiently protected against moisture: 230 volts of alternating current can
be lethal!
• Ensure that the ground connection used is of good quality and certified if necessary.
• Ensure that the switch cupboard is properly protected and power is switched off automatically when the cupboard is
opened.
• Ensure that the appropriate instructions and stickers are present on the cupboard.
• Ensure that only qualified and expert personnel work with electricity!
4.6. Hydraulic
2
Check whether the pipework, flanged connections and screw couplings have been assembled properly before putting the
system into operation. Pipes that come loose can cause substantial damage to the system as well as physical injury.
Ensure that the circuit is depressurised when deploying the system. This can be done for gear pumps and adjustable pumps
by making a free connection from P to T in the valve block or for constant pressure pumps by using a by-pass valve between P
and T. For closed pump-motor combinations with adjustable stroke plates, the yield must be completely neutral.
4.6. Direction of rotation of the pump
3
First check whether the direction of rotation of the pump is correct. The direction of rotation is indicated on the pump and the
electromotor:
8
. .
www kramp com