O-ITF-07
Page
9
(E) MAINTENANCE AND INSPECTION SERVICES
(1)
FAN
- Check blades for dirt and/or grease build-up especially on concave sides. Check set screws
and/or set collars of fan wheel and bearings for tightness. Check bearing mounting bolts and fan
housing cut off blade bolts and nuts for tightness. If fans are furnished with housing drains, see
that "weep holes" in bottom are open. If housing access door is furnished be sure it is properly
sealed and latched. Remove all debris from fan section and unit in general.
(2)
BEARINGS AND SHAFT
- Ball or Roller bearings are greased at the factory and therefore ready
to run at "start-up"; however routine maintenance and inspection is required there after. Normal
operation of bearings are "cool or warm to touch". High bearing temperature accompanied by
excessive leakage of grease indicates too much grease. High temperature with no grease showing
at the seals, particularly if the bearing seams noisy, indicates too little grease. If running
discloses an excessive amount of grease in the bearings the grease fittings should be removed
until the excess has escaped. Fan shafts should be coated to prevent corrosion yet check
that dirt or debris build-up is not accumulating which could affect balance.
(3)
FAN BEARING LUBRICATION
- Lubrication intervals vary with the period of operation and
temperature of the air. Do Not Over-Lubricate. The bearing is factory lubricated with Lithium
based grease of NGL1#2 consistency, such as Sinclair Litholene Multipurpose, Avalinia #2,
Texaco Multifax #2, Humble Lidok #2, Mobil Armyac#781 or Phillips Philube L2.