Telescopic Tender Crane Overhaul & Dyneema Renewal, Motor Yacht
A telescopic tender-garage crane came out of service with a worn dyneema lifting line and stripped mounting threads. Working at the berth with a purpose-built lifting setup, no shipyard crane, we removed the crane, extracted the internal extension arm, renewed the line, repaired the threads and load-tested with a water bag before signing off a full tender lift.
Three days alongside
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01
Made safe first
Breaker locked out and tagged, hydraulic hoses capped and labelled, deck and garage masked before a tool came out.
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02
Worn line, stripped threads
The Dyneema lifting line was chafed and flat-spotted, the arm end plate threads had stripped, and a limit switch was tired.
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03
Removed without a crane
With no shipyard crane, we rigged chain hoists, slings and timber cradles in the garage and walked the beam out onto trestles.
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04
Line and threads renewed
The old line was measured at 6.7 metres for an exact replacement; stripped threads got stainless helicoils, and two gaskets were custom-made.
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05
Reassembled and proof-tested
New Dyneema rove through the sheaves, hydraulics reconnected, a new limit switch fitted, then a water-bag proof test.
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06
Tender lifted, signed off
The crane took the tender's full weight within its 525 kg rated load, smooth through luff and extension, with no haul-out.
The captain of a motor yacht berthed at Southport booked us to overhaul the telescopic MARAX crane that launches the tender from her transom garage.
First job was making it safe: the crane breaker was locked out and tagged at the switchboard, hydraulic hoses were capped and labelled, and the deck and garage were masked up with film and blankets before a tool came out.
Inspection confirmed why the crane was due, the dyneema lifting line was chafed and flat-spotted along its length, the threads securing the arm end plate had stripped, and a tired limit switch needed replacing.
With the vessel alongside and no shipyard crane available, removal came down to rigging. We built a lifting arrangement inside the garage from chain lever hoists, round slings and timber cradles on a scissor lift, secured back to the vessel and dock, and walked the crane beam out over the swim platform onto trestles.
The internal extension arm followed, opening up the sheaves so the old line could be cut out and measured, 6.7 metres with spliced eyes both ends, for an exact replacement.
The damaged threads were tapped and repaired with new stainless helicoil inserts, two gaskets were custom-made, and new bolts, seal washers and hydraulic hoses went in on reassembly.
Reassembly reversed the lift: extension arm back into the beam, new dyneema rove through the sheaves, hydraulics reconnected to their labelled circuits and the new limit switch fitted and adjusted. Before handing the crane back we proof-tested it with a water bag, then watched it take the full weight of the tender within its 525 kg rated load, smooth through the whole luff and extension range.
Three days alongside, no haul-out, and a tender crane the crew could trust again before the vessel's next passage.
Services rendered
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