Skystream Owner’s Manual
3-CMLT-1054 Rev O XCO 1191
Pg. 22
Installing the Blades (Hub Not on Turbine)
Proper installation of the blades is critical for safe operation. The blade nuts and bolts are a unique
grade of steel and are specially coated to prevent corrosion. DO NOT substitute different nuts and
bolts. Spare nuts and bolts are provided with Skystream.
Carefully follow these instructions to obtain secure bolted joints and maximum corrosion protection,
particularly in corrosive marine environments.
• Start the assembly by positioning a blade between the blade hub and blade plate. The blades may
only be installed in one position due to the triangular boss cast into one side of the blade root.
• Install the bolts by passing the bolt through the BLADE PLATE and AWAY from the NACELLE as
shown in
Figure 11
.
• Leave the nuts loose until all blades are installed and then tighten the bolts just enough to clamp
the blades between the hub and plate.
IMPORTANT:
• Do NOT substitute nuts, bolts or washers. Contact XZERES for replacements.
• DO NOT apply lubricants to nut or bolt threads.
• RECHECK bolt torque after tightening bolts.
Bolt Tightening Sequence
• Torque the blade bolts to 50 lb-ft (68 N
·
m) in two stages.
• Following the Blade Bolt Tightening Sequence shown – torque each bolt to 30 lb-ft (41 N
·
m) in
two stages.
• After completing first stage, following the Blade Bolt Tightening Sequence, and tighten each bolt
to 50 lb-ft (68 N
·
m).
• After completing the second tightening stage RECHECK each bolt is tightened to 50 lb-ft
(68 N
·
m).
• The blades are now assembled to the hub and ready for installation onto the turbine rotor shaft.
• Coat the inside diameter of the blade hub with a multipurpose lithium grease to prevent
corrosion between the hub and shaft.
• Position the hub nut in the center of the blade hub and slide the entire hub / blade assembly
onto the shaft a
nd “spin” the entire assembly to screw the hub onto the shaft.
• Tighten the blade hub assembly to 200 lb-ft (270 N
·
m) by holding the blades and using the
“flats” on the rotor shaft.
Blade Bolt Tightening Sequence
