GBS Gearbox Services international brand of Schaaf- en Boorwerk Rotterdam B.V.
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Inspection and repair project on HANGZOU ADVANCE GEARBOX GWC 6066 gearbox

Inspection and repair on HANGZOU ADVANCE GEARBOX GWC 6066 gearbox

  • HANGZOU ADVANCE GEARBOX gearbox
  • GWC 6066
  • Input=___ rpm / ____ KW
  • Denmark

Scope of work:

We performed an inspection and repair on a gearbox HANGZOU ADVANCE GEARBOX GWC 6066.


This client from Denmark came to us with this HANGZOU ADVANCE GEARBOX GWC 6066. We inspected the gearbox and performed a repair. After a succesful testrun we shipped the gearbox back to the client.

This report presents the findings and repair information of the performed repairs onboard a vessel. Location, Guam.

GBS international was invited to perform the above mentioned work. When arrived on board the gearbox was already disassembled.

Scoop of work:

- Repair Propulsion gearbox malfunction of input shaft, gearwheel side bearing.

During this repair the bearing input-shaft (gear wheel side) was damaged. All the roller-bearings of this gearbox are renewed. The 1st and 2nd stage gearwheels and output shaft white-metal bearings are manually dressed up.

Micro pitting is a phenomenon that can be found on (hardened) gears. Multiple factors can affect the development of micro pitting, most important factors are surface roughness, lubrication or an incorrect gear mesh. The damage shows itself by a matted grey colour of the teeth. This as outcome of surface fatigue. The development of the micro pitting can be stabilized or progressive. A progressive development can eventually cause more severe pitting, and scaling.

We recommended:

- After 720 running hours the input-shaft coupling bolts needed to be checked.
- Replace the broken gauges as soon as possible.
- Replace the faulted cool water valve for a good cooling function of the gearbox.
- It is recommended to perform an annual visual inspection of the gearbox to define the progressivity of the micro pitting



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Location - date:

Denmark - October 2017

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