
130
ADJUSTMENTS - MAINTENANCE
Figure 190 Installing a new blade
NOTE
: Blade kit contains four balanced blades.
NOTE
: To check fan balance:
1. Remove sticky material inside the fan assembly.
2. Remove the belts from the fan.
3. Rotate the fan by hand and bring a set of blades
perfectly horizontal, as shown in Figure 191.
4. Let go the fan. If the fan stays still, these two blades
are well balanced. If the fan starts rotating, this
means a blade is heavier than the opposite blade
(see Figure 192). Weight must be added to the op-
posite blade, on the blade’s central arm. Special
holes are drilled in the blade arms in order to add
bolts as weight
.
NOTE
: Secure the weight to the middle blade arms.
5. Repeat steps 3 and 4 for the other set of blades.
Figure 191 Blades in horizontal position
Figure 192 Unbalanced blades causes fan to rotate
Pull blades out
before tightening
bolts
Blade in horizontal
position
Blade in horizontal
position
Blade is pulled up.
Too light
Weight must
added
Blade is pulled
down, too heavy
Manual
No
. F4117E987E V1.1
Содержание F41
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