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     This repair, if I may call it so, is absolutely unique, and falls under the category of "desperately drastic" overhauls (senseless, from my point of view, by the way).

    The main character is the Linde MBV 105 variable displacement motor, which for the last decade had been driving one of the anchor winches of a large container ship. During the last trip the vessel ran into extremely bad seas, and one of the huge anchors, despite the three mechanic safety features, "went for a dive". There's still no official explanation on how all the  three systems managed to fail at the same time (the manual band brake, the chain lock, and a smaller chain, that was supposed to secure the main chain in case of other locking devices malfunction), but I think that once again it was proved that no fail-proof safety feature is above human factor.

    By the time the crew noticed that one of the anchors was missing, it had already unrolled a hundred odd meters of chain, and since the hydraulic motor was engaged - only God know how many "dry" turns it made (bearing in mind the huge ratio of the gearbox). Unsurprisingly, the winch wouldn't pull up, on account of which the anchor and the attached piece of chain had to be "forcefully retired" in the middle of the Atlantic ocean by means of an oxy-acetylene torch.

     Since the winch was still able to turn, it was used for mooring for a period of time I would like to omit (embarrassing) -  despite the incredibly loud "taka-taka" coming from the motor with every turn. Finally, a decision was made to disassemble the motor and and see if it was possible to repair it -  however a condition was imposed - since the motor had proved "good enough" for mooring, no matter how bad its condition would reveal, it would still have to be re-mounted on the winch the same day, because the ship couldn't moor without it.

   As you can see from the pictures, the disassembly alone was all but a simple task, mainly because of the extensive marine treatment the motor had suffered along the years of service, which meant that all of the screws had to be drilled out. When the end-cover was finally lifted - it became clear that the motor was dying - one of the pistons got stuck in the respective bore and ripped retainer plate off of its place (by separating the screw heads). It was under this condition that the motor had moored the vessel for the above-not-mentioned embarrassing amount of time, rendering the rest of the internal parts (main shaft included) non-reusable.

   Despite all this and the fact that there were no parts in stock to repair the motor, the client was adamantly insisting on the above stated conditions (make it turn no matter what and the same very night...), and all we had in stock for that model was the new barrel - not more not less...

   It was the first time I used an angle grinder to "adjust" components of a hydraulic motor! I had to use the grinder to "cut out" the stuck piston, then I had to smoothen all other pistons just to fit the new barrel (again with the grinder), then I had to straighten out the crooked and cracked retainer with the help of a hammer and an anvil, and I had to do a lot of other nasty things I thought I'd never do. In the end, the motor was able to turn (with "taka-taka"), and it has been mooring for a couple of  weeks now - aleluia, gentlemen!!! Volumetric efficiency - well - above zero...

    A new motor is coming, so this hydraulic torture will be over soon. Still a nice story to be recalling in the future...
BMV 105 Variable Displacement Motor
BMV 105 Variable Displacement Motor
BMV 105 Variable Displacement Motor
BMV 105 Variable Displacement Motor
BMV 105 Rotary Group
BMV 105 Rotary Group
BMV 105 Damaged Shaft
BMV 105 Damaged Central Pin
BMV 105 Damaged Pistons
BMV 105 Damaged Retainer