NGI provides maintenance services focused on blade bearings and yaw bearing systems to maintain proper load transfer, reduce mechanical wear, and support reliable turbine operation. Work is performed on critical bearing interfaces and associated components to ensure proper function, lubrication, and structural integrity.
Maintenance scopes are executed with attention to bearing condition, lubrication performance, and connection integrity. Each scope is performed using controlled procedures, with verification at each step to ensure proper execution and system reliability.
Inspection of blade bearing condition, including raceway surfaces, grease condition, and seal integrity. Checks for wear, spalling, pitting, contamination, and overheating. Bearing rotation is evaluated for smoothness, resistance, and abnormal noise.
Verification and correction of blade bolt alignment to ensure proper seating and even load distribution across the blade root interface. Bolt position, stud condition, and hole alignment are checked to identify misalignment, cross-loading, or improper installation.
Verification of blade bolt torque using calibrated tools to ensure all fasteners meet specified values. Torque sequences are followed as required to maintain uniform load distribution and connection integrity.
Application of grease to blade bearings using approved methods to ensure proper lubrication across the raceway. Includes verification of grease type, volume, and distribution. Bearings are rotated during greasing as required to ensure full coverage. Old or contaminated grease is purged where applicable, and grease flow is monitored to confirm proper delivery.
Inspection of blade-to-hub interface, including mounting surfaces, contact areas, and bolt holes.
Checks for elongation, fretting, cracking, corrosion, or signs of movement at connection points
Inspection of yaw bearing condition, including raceway surfaces, gear teeth, lubrication condition, and seal integrity. Greasing is performed to ensure proper lubrication across the raceway and gear interface. Checks include wear patterns, contamination, insufficient lubrication, and signs of excessive loading.
Inspection of grease lines, fittings, and distribution systems supplying blade and yaw bearings.
Checks for blockages, leaks, damaged lines, and proper grease flow to ensure consistent lubrication.
Inspection of bearing seals for damage, displacement, or leakage. Verification that contaminants such as water, dirt, or debris are not entering bearing systems.
Observation of blade pitch and yaw movement during operation to verify smooth rotation, consistent response, and absence of binding or irregular motion.
All work performed, measurements, and findings are documented, including torque values, lubrication activity, and identified issues.
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