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depressant Protections against abrasion
and scuffing Gears (steel/bronze) Paraffinic Oiliness
Antioxidant Reduce friction, temperature
rise, wear, and oxidation Machine tool slideways Paraffinic or naphthenic Oiliness; tackiness Maintains smooth sliding at very
low speeds. Keeps film on
vertical surfaces Hermetically sealed refrigerators Naphthenic None Good thermal stability,
miscibility with refrigerant, low
flow point Diesel engines Detergent
Corrosion inhibitor Vary with type of engine thus
affecting additive combination Paraffinic or naphthenic Reference: Neale, M.J., Lubrication: A Tribology Handbook. Butterworth-Heinemann Ltd., Oxford, England. do not suggest or imply that lubricants listed as being equivalent are identical. The lists do indicate that the
two lubricants are in the name class, have the name viscosity, and are intended for the same general use.
The chart of interchangeable industrial lubricants lists the following categories:
! General purpose lubricants ! Antiwear hydraulic oil ! Spindle oil
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28 Feb 99
Importance of Lubricant Properties in Relation to Bearing Type
Type of Component Lubricant Property Plain Journal
Gears Open Gears,
etc. Clock and
Latches, etc. 1. Boundary lubricating properties 1 2 3 2 2 1 2. Cooling 2 2 3 - - - 3. Friction or torque 1 2 2 - 2 1 4. Ability to remain in bearing 1 2 - 1 3 1 5. Ability to seal out contaminants - 2 - 1 - 1 6. Temperature range 1 2 2 1 - 1 7. Protection against corrosion 1 2 - 2 - 1 8. Volatility 1 1 - 2 2 1 Note: The relative importance of each lubricant property in a particular class of component is indicated on a scale from 3 = highly
important to - = quite unimportant.
Reference: Neale, M.J., Lubrication: A Tribology Handbook. Butterworth-Heinemann Ltd., Oxford, England. ! Way oil ! Extreme pressure gear oil ! Worm gear oil ! Cling-type gear shield (open gears) ! General purpose extreme pressure lithium based grease ! Molybdenum disulfide extreme pressure grease. (5) Spindle and way oils are not widely used. One of the last three classes on the list is a special
preparation for open gears and the other two are classes of grease. General purpose oils, antiwear
hydraulic oils, and EP gear oils are best described by comparison with the nonspecialized industrial oils
discussed earlier. Nonspecialized oils contain a category called general purpose oils. This term is also
used in the PEM list but it differs from the previously described general purpose oil category in that the
additives may not be the same. In some cases, brand names indicate that EP additives have been included.
In other cases, AW is indicated but not R&O. This raises the possibility that R&O additives are not
present. AW hydraulic oil is a general purpose oil, but its antiwear properties are sufficient to pass the
Vickers vane test for hydraulic applications when this is required.
(6) The EP gear oils should correspond to those described under nonspecialized industrial oils except
that EP additives are included and viscosities may be as high as ISO 2200. The EP classification of gear
oil should not be confused with the SAE gear oil classification which is for use in automotive gear systems.
SAE gear oils are formulated differently and are not discussed in this manual.
13-8 EM 1110-2-1424
28 Feb 99 (7) While grease preparation varies greatly among producers, only two types are given in the PEM list:
No. 2 lithium EP and molybdenum disulfide EP No. 2. These are the two most widely used industrial
greases. The name molybdenu...
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