Usage:
Recommendations on Lube Oils
1. General
The oils listed in LSN 935 1410, ...1420, ...1430 are a selection of lube oils recommended by L + S for use in cylindrical, bevel and planetary gearboxes. CLP industrial gear oils, motorcar transmission oils and HD motor oils meet the requirements specified by L + S as mandatory. These recommendations are based on applicable product information and many years of experience in this field.
The lube oil brands (mineral oil, synthetic oil, or motor oil) are primarily selected by the operator. In this context, logistics play an important role. The recommendations are not meant to provide quality standards for the individual lube oils.
All oils listed are compatible with one-pot paint material (not nitrocellulose lacquer) L+S uses for inside paint coatings as well as the standard elastomers of NBR and FPM (depending on application temperature). As regards mineral based gearbox lube oils an oil bath temperature of +85°C should not be exceeded. For short operating periods peak temperatures of +100°C are admissible, but it should be noted that these may considerably reduce the useful life of the lubricant. Continuously prevailing higher temperatures will reduce the operating viscosity significantly and lead to premature aging of the lubricant. If an admissible temperature limit is exceeded the oil molecules chemically decompose and cause smell, deposits and residues in the system. If higher temperatures are to be expected or higher continuous temperatures are experienced in operating practice, synthetic oils based on polyalphaolefins (PAO) are to be used that feature a considerably flatter temperature-viscosity characteristic curve.
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Attention! A mandatory requirement specified on the nameplate and/or in the operating manual are the viscosity indication and the special notes. If the viscosity requirements are not met or a gearbox lube oil other than listed is used the responsibility for technical suitability of the lubricant lies solely with the Operator. The use of lubricants not meeting the equality standard described below may result in L+S' warranty obligations becoming forfeited. It is expressly pointed out that any lubricant manufacturer or supplier is responsible for the quality of its products, eg with respect to impurities or differences between individual batches. |
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NOTE: L+S gearteeth calculation according to DIN 3990 (including micro-pitting determination to FVA No. 54) shows the required breakdown-load stage (SKS) for the oil. If a breakdown-load stage SKS of > 9 is determined here, a note must be included in the operating manual saying that the lubricant selection must be included in the operating manual saying that the lubricant selection is restricted to brands featuring a "high" micro-pitting (frosting) load carrying property.
NOTE: The maximum and minimum application temperatures of individual gear oils may deviate significantly with regard to the technical parameters of "flashpoint and our pour point". Relevant data and properties of the gear oils must always be taken from the technical data sheets issued by the oil producers.
As pointed by the lubricant producers, the products listed are available under the same tradename on a world-wide basis and have comparable technological characteristics.
1.1 Synthetic oils on polyalphaolefin basis-PAO
Synthetic oils have a higher viscosity index (VI) than mineral oils and are thus able to reduce the influence of temperature on viscosity. Although the polyalphaolefin-based synthetic oils listed (Column Ls 3) can be mixed with mineral oil at any desired ratio, care should nevertheless betaken to limit the amount of residual mineral oil in the gearbox casing to 5 to 10% to avoid clouding and additive precipitation.
1.2 Synthetic oils on polyglycols basis-PG (presently not permissible for L+S gearboxes)
NOTE: In view of the fact that synthetic oils on polyglycol basis may become incompatible with the paint coat, standard seals and oil sightglass materials employed, these lubricants must not be used without prior consent obtained from the gearbox maker!
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Attention! Mixing polyglycols with mineral oils is strictly prohibited! |
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1.3 Quickly biodegradeable oils on synthetic-ester basis-HEES
Under certain conditions, quickly biodegradeable lubricant oils (synthetic ester-HEES) not listed here may also be employed. Results of various research projects, for example FKM No. 051950, VDMA Data Sheet 24 569 as well as applicable experience gained by seal manufacturers and oil companies indicate that quickly biodegradeable oils may be incompatible with certain seal and gasketing materials and paint materials or may reduce the friction characteristics of multiple pates. If such oils are to be used, special materials (not L+S standard materials) may be needed that have to be tested to ensure they are compatible with the oil.
NOTE: Before using quickly biodegradeable oil (first filling or brand change) consult with the gearbox manufacturer!