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Fan Bearing Maintenance
For most applications, a lithium base grease (such as Mobilith AW2) conform-
ing to a NLGI Grade 2 consistency should be used. This type of grease inhibits
rust, is water resistant, and has a temperature range of -30 to 200°F (-34.3 to
93.3°C), with intermittent highs of 250°F (121°C). For extreme duty and high-
er temperature applications, use Mobilith SHC220 synthetic hydrocarbon
grease.
When greasing bearings, it is important not to over-grease. This is especially
true if the bearings are equipped with extended grease lines and the bearings are
not visible. In this case, more bearing failures occur due to over-greasing than
under-greasing. It is best to give the bearing just one "shot" of grease periodi-
cally if the bearings are not visible. When the bearings are visible, pump in
grease until a small bead of grease forms around the bearing seals. It is very
important that fan bearing greasing take place while the fan is operating.
AD-8 l
Addendum
CAUTION: Caution should be taken while working on and near rotating equip-
ment to avoid personal injury.