13
Main Bearings
The two main ball bearings at each end of the bearing housing are identical. If the crank
makes excessive noise or offers resistance without the chain in place, the main bearings
should be inspected for excessive tightness or misalignment. If the crank rattles while turning,
the bearing assembly may be too loose. In either case, contact Windstream Power’s Service
Department at (802) 425-3435. A bicycle repair shop will also have the required tools to
remove the crank arm and inspect or change out the bearings. We use standard bicycle parts.
Chain Tension
Periodically check the drive chain tension. If the chain makes a “growling” noise, it is too tight.
If the returning loop of the chain appears floppy, the chain is too loose. To adjust the chain
tension, remove the chain guard, and using a 10mm nut driver or socket wrench, loosen the
four generator mounting nuts. Next, adjust the generator position, and then retighten the
nuts. Replace the chain guard, ensuring there is no rubbing or scraping noises between the
chain guard and the chain or pedals.
Drive Train Alignment
It is also important to periodically check that the
generator sprocket is in line with the chain and
with the drive sprocket. Over time, the 2.5 mm
set screw that holds the sprocket tight to the
shaft will loosen. Adjust the alignment of the
generator shaft by loosening the generator
sprocket set screw (with the M2.5 hex key
supplied) and sliding it along the generator shaft
or allowing the chain to position it, then
retighten the set screw onto the flat of the
generator shaft.
If the generator does not seem to be producing
power, check if the set screw has loosened
completely. If it has, the generator shaft can
become disconnected from the sprocket so the
sprocket would no longer turn the shaft
properly. When tightening the set screw, there
should be about 1.5 mm of space between the
unit’s base and the sprocket.
