Qmark WEB -Heavy-Duty Belt Drive Exhaust Fans - Manual (Page 6)

BEARING MAINTENANCE
D. SEALED BEARINGS: Sealed for life bearings are pre-lubricated with the correct amount of
manufacturer-approved ball bearing grease, and are designed for application where relubrica-
tion is not required.
Units feature two single row deep groove bearings in rugged cast aluminum or cast iron bearing
bracket. Dirt and grease guard seals are an integral part of the assembly. For high
temperature applications, the bearings are pre-lubricated with high temperature greases.
RELUBRICATABLE BEARINGS
Selection of the correct bearing grease and greasing intervals depends on several items.
Extreme high or low temperatures, dirty or damp surroundings, are all items that will require
more frequent greasing or special greases.
Conditions Around Bearing Operating Temperature of Fan Greasing Intervals
Fairly Clean up to 120°F 6-12 months
120°-160°F 2-3 months
160°-200°F plus* 1-2 months
Moderate to up to 160°F 1-2 months
Extremely Dirty 160°-200°F plus* 2-4 weeks
Cold Storage Room every defrosting period
or no more than 4 months
* For fan applications over 200°F: greasing intervals should be from several days to 2 weeks, de-
pending on the temperature.
** For vertical installations, greasing intervals should be twice as frequent as table values