Time-saving repair job for Russian trawlerLLV Kaprodon’s servo piston, as good as new and on the way back to the yard after only three days. Photo: Marine Shaft

When Russian trawler LLV Kaprodon was docked in Norway for a refit, the news that a vital spare part could take four months to obtain took the owners instead to Marine Shaft in Denmark.

Based in Hirtshals, Marine Shaft specialises in straightening, repairing and fixing shafts of all types, and on this occasion turned the job around in only three days, resulting in a substantial saving in time and expense for the Norwegian yard and the trawler’s owners in Arkhangelsk.

LLV Kaprodon was docked for repairs and when the Alpha Diesel 44KV13 gearbox was disassembled, inspection showed severe wear and damage to the bearing journal of the servo piston and other surface damage. The initial conclusion was that a replacement part would be required, but when it turned out that there could be a four-month delivery time for a new servo piston, the company looked for alternatives.

MarineShaft came up with a repair plan to repair servo piston using a gentle welding method,  laser cladding. The servo piston was delivered to Marine Shaft’s workshop in Denmark and the repair job included disassembly, measurement and testing of hardness, skimming of white metal in the bearing, machining of the damaged areas before and after laser cladding. The servo piston was cold straightened and underwent an LPI test.

An NDT test was conducted by a third party.

After three days at Marine Shaft’s workshops, the servo piston was on its way back to the shipyard in Norway, as good as new and with the full class-approval by RMRS.

The work was carried out for less than the cost of a new servo piston – and saving in time tells its own story.

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