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Joe who said:
>We recently noticed that 3 or 4 fans in our greenhouse
have locked up.
>Presumabley, the bearings are frozen. These are expensive fans (Patton high >velocity) costing over $200 each. They were purchased about 5 years ago. >What is the life expectancy of such fans? I assume these are fans having small, low power motors??
Moisture
causes the steel shafts to rust, which then freeze in the bronze "sleeve
bearing."
I have fixed such
problems successfully, following these steps:
1. Remove fan blade protector
cage.
2. Remove oscillating/stationary button by
pulling up/off
3. Remove the fan blade, by turning
locking nut clockwise (reverse thread)
(If plastic housing around
motor, remove it first.)
4. Put markers opposite each
other on the two metal parts of the motor housing,
so you will know how to put them back together again
the way they were.
5. Remove the three or four long
screws that keep the two parts of the
motor housing together.
6. Remove the TOP housing part on the side
of the rotor shaft.
7. Remove the rotor/shaft unit
(watch washers stay in the BOTTOM
housing bearing)
8. With very
fine sandpaper, remove the rust from the rotor
shaft,
9. Apply some lubrication to the full
length of the shaft with oily cloth (thin oil)
10. Lubricate BOTTOM housing "ball
bearing."
10. Reassemble all, making certain the markers
on the housing parts are opposite each other.
peter
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