Vibration measurement, extensive inspection and repair on main hoist gearbox ZPMC FH 1690.21.C1B-00

Scope of work:

We performed an inspection and repair on a gearbox ZPMC FH 1690.21.C1B-00.

The conversion operations consists of:

• A container handling company in the port of Rotterdam invited GBS to perform a vibration measurement on a main hoist gearbox of a deep sea dual trolley container crane.振華港機齒輪箱
  
  The spectra recorded on the gearbox showed clear fault frequency peaks related to the high-speed shaft bearings. These recorded fault frequencies indicated bearing damage on the outer ring raceway and rolling elements.
• GBS recommended replacing both high-speed shaft bearings as soon as possible and perform an extensive visual inspection of the gearbox.
• During the first scheduled stand still of the crane GBS performed the repair of the main hoist gearbox.
• Activities performed during repair of main hoist gearbox:
• Alignment check of both electric motors
• Draining oil from gearbox
• Removing upper casing
• Check of static tooth contact patterns, backlashes and clearances
• Transport high-speed shaft to workshop
• Replacement of high-speed shaft bearings
• Inspection of gears and bearings and cleaning gearbox
• Assembly of high-speed shaft and gearbox
• Alignment of both electric motors
• Refill gearbox with new oil
• Perform test run