Weir Warman 650 M200-MCR-G, Manual, Page: 228 / 287

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BA 7300 EN 04.09
1.1.1 Oil groups
In table A, five oil groups are distinguished:
• Mineral oils (MIN oil)
• Polyglycols (PG oil)
• Poly­α-olefins (PAO oil)
• Biologically degradable oils (BIO oil)
• Physiologically safe oils approved in accordance with NSF­H1 (PHY oil).
1.1.2 Oil temperatures
The synthetic oils have a wider temperature range and a higher viscosity index, i. e. a flatter
viscosity­temperature gradient, than the mineral oils. Guideline values for temperature range:
─ mineral oils approx. ­ 10 °C to + 90 °C (short term + 100 °C);
─ polyglycols and poly­α-olefins approx. - 20 °C to + 100 °C (b 110 °C);
─ bio­degradable oils (synthetic esters) approx. ­ 15 °C to + 90 °C.
(does not apply to natural esters ­ rape seed oils, etc. ­) .
The upper and lower operating temperatures of certain gear oils may deviate widely
from the values indicated. For operating conditions outside the above mentioned
temperature ranges, the flash point or pour point of the oils must be observed. For these
and other data and properties of the gear oils, refer to the oil manufacturers' technical
data sheets (for this purpose FLENDER must be consulted).
1.1.3 General oil service lives
According to the manufacturers, the following are the minimum periods during which the oils can be used
without undergoing any significant change in quality. They are calculated on the basis of an average oil
temperature of 80 °C:
─ for mineral oils, biologically degradable oils and physiologically safe (synthetic esters) oils 2 years
or 10 000 operating hours (does not apply to natural esters ­ rape seed oils, etc. ­) .
─ for poly­α-olefins and polyglycols: 4 years or 20 000 operating hours.
The actual service lives may be higher or lower for temperatures over 80 °C. The general
rule is that an increase in temperature of 10 K will halve the service life.
1.1.4 Oil change
The degree of purity of the oil affects the operating reliability and life span of the oil and the gear units. It
should therefore be ensured that the oil in the gear unit is clean. For the first oil change after start­up as well
as for subsequent oil changes follow the instructions in the gear­unit operating manual. In the case of larger
oil quantities an analysis should be carried out before cleaning or changing the oil.
When changing oil of the same type, the quantity of oil remaining in the gear unit should be kept as low as
possible. Generally speaking, a small residual quantity will cause no particular problems. Gear oils of
different types and manufacturers must not be mixed. If necessary, the manufacturer should confirm that
the new oil is compatible with residues of the old oil. When changing to very different types of oil or oils with
very different additives, especially when changing from polyglycols to another gear oil or vice versa, the
gear unit must always be well flushed out with the new oil. Residues of old oil must be completely removed
from the gear unit.
FLENDER should be consulted or the suitability should have been confirmed in writing
by the lubricant manufacturer.
Gear oils must never be mixed with other substances. Flushing with paraffin or
other solvents is not permitted, as traces of these substances always remain
inside the gear unit (see also any instructions in the product­related operating
manuals).
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