Semi-Foldable Marine Crane – Knuckle Boom with Telescopic Arm

The semi-foldable marine crane combines a short main boom with a folding outer arm that carries several telescopic sections. It stows low behind the wheelhouse and still reaches well past the ship’s side. Marine Crane builds semi-foldable cranes in Türkiye for supply boats, patrol and SAR vessels, pilot boats and work boats.

SEMI-FOLDABLE CRANE · 7-STAGE TELESCOPE

Technical specifications

Boom sections 8 (knuckle arm + 7 telescopic)
Telescopic extension 10.5 m
Slewing drive 2 × hydraulic gearmotor
Transport height 3.35 m above pedestal base
Control Local valve bank or radio remote
Winch Hydraulic hook winch
Stowage Folded over the deck

Features

  • Belly-box radio remote lets the operator work from the deck
  • Platform valve bank with proportional levers
  • Automatic fold and unfold sequences
  • Overload protection set from the certified load chart
  • Low transport height for a clear view from the bridge

Capacity range and options

Semi-foldable cranes are sized per project. Tell us the SWL, outreach and deck space and we prepare the load chart and general arrangement.

Typical vessels and applications

  • Supply and crew boats
  • Patrol and search-and-rescue vessels
  • Pilot boats
  • Work boats and multicats

Engineering details

Structure

  • Short main boom with folding outer arm carrying 7 telescopic sections
  • Telescope extension 10.5 m with sliding pads in each section
  • Two hydraulic gearmotors on the slewing ring

Hydraulics and control

  • Platform valve bank with proportional levers
  • Belly-box radio remote with emergency stop
  • Load-holding valves on lift, fold and telescope cylinders

Safety

  • Overload protection set from the certified load chart
  • Fold and unfold sequences with interlocks
  • Low transport height for bridge visibility

Testing and documentation

  • Static load test with test weights according to the applicable class or national rules (for cranes up to 20 t SWL typically 1.25 × SWL)
  • Functional test of all motions, limits, brakes and the emergency stop
  • Delivered with general arrangement, load chart, hydraulic and electrical diagrams, foundation loads, operation and maintenance manual, spare parts list and test certificates

Frequently asked questions

Why choose a semi-foldable crane?

It gives long telescopic reach with a low stowed height, so it suits small and medium vessels where bridge visibility and deck space matter.

Can the crane be operated remotely?

Yes. A radio remote control lets the operator stand on deck close to the load.

Related pages

Request a quotation

Send the vessel type, required SWL and outreach. We reply with a preliminary load chart and an offer.

Phone: +90 530 662 66 45
Email: info@marinecrane.com.tr
Address: Pendik / İstanbul, Türkiye

Quotation request form

Fill in the form and our engineers will reply with a preliminary load chart and an offer.

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