TFN

Verify correct pitch angle adjustment across full forward-stop-reverse range; confirm hydraulic pressure maintains 12.5 MPa maximum; test solenoid valve function and pilot check valve operation; inspect pitch rod and crosshead for play or misalignment

Examine all O-rings and seals for cracks, hardening, or leakage (typical lifespan 6-8 years); perform oil sample analysis for contamination and viscosity; check grease lubrication condition in hub interior; inspect for external hydraulic fluid drips around cylinder and connections

Underwater or dry-dock visual inspection for pitting, erosion patterns, and rough areas on blade faces and suction sides; photograph and document cavitation burn locations; inspect blade tip rake design for surface integrity; assess leading edge condition for roughness that would increase cavitation risk

Measure blade rake and sweep angles against design specifications; check for bent, twisted, or cracked blades using visual inspection and tactile assessment; inspect blade root and fillet areas for cracks; verify blade thickness uniformity using ultrasonic thickness gauge; test blade resonance to detect internal damage

Inspect push-pull rod for bending, cracks, or metal fatigue; verify proper alignment between rod, crosshead, and hydraulic cylinder piston; check linkage pin clearances and bearing play; perform functional test of rod movement through full pitch range; inspect for corrosion or galling on rod surfaces