GBS Gearbox Services international brand of Schaaf- en Boorwerk Rotterdam B.V.
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Inspection and Repair of CHONGQING gearbox

Inspection and Repair of Chongqing GWS4245 gearbox

  • CHONGQING repair
  • GWS4245
  • Input=___ rpm / ____ KW
  • CHONGQING gearbox repair
  • germany

Scope of work:

We performed an inspection and repair on a gearbox CHONGQING GWS4245.

The conversion operations consists of:

  • inspection performed on the propulsion gearboxes of the NST xxxx. The Chief Engineer observed high temperatures near the input shaft bearing (motor side) of the starboard side gearbox.
  • Brief Findings

    Starboard side gearbox




  • Clear signs of micropitting observed on the inner race of the bearing and on at least one rolling element. The same rolling element showed signs of wear due to axial load. Also, minor discolorations observed on the inner race and several rolling elements.
  • Bearing cover was removed to check seal, no abnormalities found that could induce high temperature.
  • Chief Engineer checked lubrication system and cleaned cooling systems. No abnormalities found there.
  • Other bearings and gears did not show significant damage.

Port side gearbox

  • Except for some minor deficiencies on several bearings (normal wear) and the gears, the gearbox is in good condition.

Based on the findings of the starboard side gearbox, the high temperatures are believed to be caused by the ahead clutch shaft bearing on the motor side. Also the seals of the input shaft are worn It is recommended to maintain a reduced motor speed at the starboard side gearbox in order to keep the temperatures near the bearing acceptable, until it is replaced.
The bearings and seals of the port side gearbox were replaced in november 2010 in Rotterdam by our company.

Location - date:

Spain - Tarragona - September 2010

Other types of same brand: