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11.0 Maintenamce
NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer
on page v of this document.
DOC012R02 AOC 15/50 User Manual Nov 2001
91
11.2 Tower Assembly
Tower:
The tower fasteners and members should be checked visually for damage. A random check
of bolt torques should be carried out on flanges and braces (see Appendix J). All pal nuts
should be in place and the anchor bolt nuts and hinge nuts should be seated snugly.
Tower Top:
All nuts and bolts on the tower top casting should be checked for proper torque (see
Appendix M). The yaw lock should be checked for proper operation.
Twist Cable:
The cable connections should be checked at both ends for any damage, such as bare copper,
melted insulation or loose strain relieves. The cable should be inspected for wear, abrasion,
cracking or discoloration. If the cable is excessively twisted it should be disconnected at the
tower junction box and untwisted.
11.3 Drive Train Assembly
Gearbox:
The oil level should be checked and the seals inspected. The torque on all fasteners should
be checked, where accessible (see Appendix M).
Generator:
The generator should be inspected for defects such as discoloration due to heat, signs of
burning, etc. The torque on the mounting bolts to the gearbox should also be checked (see
Appendix M).
Yaw Bearing:
The two bolt groups securing the yaw bearing to the transmission and tower top casting
should be checked for proper torque (see Appendix J). If any bolts turn during the torque
check, they must be removed and replaced using Loctite (see Appendix J). The bolts
connecting the yaw bearing to the tower top casting should not have Loctite applied to them,
if they are replaced. The yaw bearing should be greased periodically using a standard grease
gun (usually five pumps per grease nipple). The seal should be inspected for cracks and
other damage, and be repaired or replaced as necessary. For repairs it is recommended to
use 3M Fast Track Adhesive. The yaw lock should be greased heavily.
Parking Brake:
The friction disks should be inspected for wear, checked to see whether it operates correctly
and replaced if necessary.
Oil Filter: