Owner`s manual

15
Preventive Maintenance
We recommend that the bearings be re-packed (re-greased) every 8-12 years. There are four tapered
roller bearings, two for the alternator and two for the tower adapter. There are two bearing seals and we
recommend that these seals be replaced when the bearings are re-packed.
The strength of the blades, particularly at the root (inner) end, may degrade over time due to flexure and
UV degradation of the fiberglass material. The symptom of degradation is a reduction in blade stiffness
fore-and-aft. The blades have to become very flexible in the fore-aft direction before there is any risk of
tower strikes during severe weather. We recommend that you check blade stiffness about every 10 years
and replace the blades if they become extremely flexible.
In some installation environments, the blades will develop fiberglass “fuzz”. If this is found, the blades
should be lightly and evenly sanded with fine grit sand paper and painted to provide UV protection.