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Boom hinge repairs on a Liebherr deck crane type CBB 24(30)/26

One of the ship cranes on board developed excessive jerking and boom wobble whenever slewing motion was started or stopped. On owner's request, our highly skilled Liebherr Service Engineer attended to investigate. Besides wear in the slewing directional valve (Load-sensing valve, LUDV block) and a faulty slewing counter balance valve, also the boom foot assembly was worn. The seats for the boom hinge bearing bush and the boom foot pin were found worn down and oval in shape.

ALATAS Project Management Team established a boom hinge repair procedure based on which the ALATAS afloat repair team & machinists attended and carried out the boom repairs, at anchorage.
Repairing the jib foot assembly required removal of the crane boom, in situ line boring of the boom hinges, machining of new pins, bushes & Teflon distance rings, re-assembly and load testing. Pin material used was 34 CrNiMo6V (nitrated) and copper bush material was CuAl10Fe5Ni5-B.

ALATAS carried out the repairs on a 24/7 around the clock basis and managed to substantially reduce the repair time, resulting in considerable cost savings for the owner. Also, by fully utilizing ALATAS expertise, Ship Yard assistance was not required, thus resulting in further cost and time savings.

This is what our customer had to say:
"..At this point we would like to thank ALATAS for all the efforts made onboard and the nice outcome and professionalism of the ALATAS team that attended."


Boom Hinge Repairs
Boom Hinge Repairs

Boom hinge pin hole elongated

New pin in progress to install

Boom Hinge Repair
Boom Hinge Repairs

Final jacking of new pin at stbd side

Newly installed port bush

Boom Hinge Repairs
Boom Hinge Repairs

Preparing to lift the boom to put at jib rest

Preparing to lift the boom to put at jib rest

Boom Hinge Repair
Boom Hinge Repair

30T Load test

30T Load test

Boom Hinge Repair

30T hoist pressure reading




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