RAMMER RD2019 Operator's Manual page 48

Carrier hydraulic oil
Impurities enter the hydraulic system:
■ During hydraulic oil changes and refilling.
■ When components are repaired or serviced.
■ When the attachment is being installed on the carrier.
■ Because of component wear.
Normally the existing main oil filters of the carrier are used as attachment circuit
return line filters. Consult the carrier manufacturer or your local dealer concerning
instructions for the filter change intervals.
In crusher work the carrier oil filter must fulfil the following specifications:
■ The oil filter must allow maximum particle size of 25 microns (0.025 mm).
■ The oil filter material must be man-made fibre cloth or very fine gauge metallic
mesh to withstand pressure fluctuations.
■ The oil filter must have a nominal flow capacity of at least twice the
attachment's maximum flow.
In general, oil companies guarantee new oils to have a particle count of 40 microns
maximum. Filter the oil when filling the tank.
The damage caused by hydraulic oil impurities in the carrier and attachment
circuits:
Shortened working life of pumps and other components
■ Rapid wear of parts.
■ Cavitation.
■ Wear of cylinder and gaskets.
Reduced attachment efficiency
■ Accelerated wear of moving parts and seals.
■ Oil leakages.
Shortened working life and reduced lubricating capability of oil
■ Overheated oil.
■ Deteriorated oil quality.
■ Electro-chemical changes in hydraulic oil.
Malfunction of valves
■ Binding spools.
■ Rapid wear of parts.
■ Blocking of small holes.
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RD2019 A-JAW, D-JAW, S-JAW, M-JAW