CSH (Central System Hydraulic Mooring Winch)

Sample hydraulic oil at 1000-2000 operating hour intervals or annually; test for viscosity, acid number (TAN), water content, and particle contamination (ISO 4406 codes); replace oil per manufacturer specification; confirm proper oil type in use

Measure brake friction material thickness at multiple points during winch operation; visually inspect for rust, oil saturation, or foreign material buildup on brake drum; verify spring-loaded brake closes fully with spring power during pressure loss; perform load holding test at rated SWL

Inspect all foundation bolts for tightness using calibrated torque wrench; verify torque specification matches design drawings; check for cracks in base frame using liquid dye penetrant on cast steel components; measure bolt preload with ultrasonic bolt tensioner; confirm welded seams free of cracks and corrosion pitting

Measure chain link diameter at minimum 5 locations using calibrated chain gauge; mark wear progression at reference points; rotate chain end-to-end regularly to distribute wear; perform ultrasonic or eddy current thickness measurement on high-wear links; document trend over survey intervals; condemn chain if wear exceeds 12% per international standards

Verify three-position solenoid control valve operation (raise/lower/hold); test frequency drive converter alarm outputs; confirm emergency stop (e-stop) pulls motor current to zero within 2 seconds; inspect wiring insulation for chafing or water ingress in junction boxes; perform insulation resistance test (≥1 MΩ); verify DC supply to brake solenoid independently powers emergency circuit