CBW 300t
Liebherr Maritime Deck Cranes. Liebherr Maritime manufactures specialized marine and offshore cranes for cargo handling, ship-to-ship operations and offshore applications (Oil & Gas, wind energy). The product range includes floating cranes (CBG), cylinder luffing ship cranes (CBW, LS-C), ram-luffing offshore cranes (RL/RL-K), mast-type cranes (MTC) and board offshore cranes
Inspector Detail
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Common issues
- Slew bearing bolt preload loss and bearing play developing over time
- Luffing/hoist cylinder seal leakage causing slow drift under load
- Wire rope wear, corrosion or broken wires on hoist and luffing falls
- Hydraulic oil contamination accelerating pump and valve wear
- Slew gear/pinion tooth wear from misalignment or inadequate lubrication
- Overload protection, anti-two-block or limit switch drift and false trips
- Boom pendant/tie rod and pin corrosion at structural connections
Inspection checklist
- Visual inspection of boom structure for cracks, deformation or corrosion at welds
- Slew bearing bolt torque check and bearing play/backlash measurement
- Wire rope inspection for broken wires, diameter reduction, corrosion and lubrication
- Hydraulic cylinder rod and seal inspection for leakage or scoring
- Function test of overload protection, limit switches and anti-two-block device
- Hook and load block inspection for deformation, with NDT if overload is suspected
- Hydraulic oil sampling and analysis
- Slew and hoist brake function test
- Structural NDT of highly stressed pin connections and boom foot area
Service intervals
| Hydraulic oil sample analysis | every 2000-3000 running hours or annually |
| Hydraulic filter replacement | per the manufacturer's schedule, typically every 500-1000 hours or on differential pressure indication |
| Wire rope thorough inspection | every 3-6 months, with weekly visual checks |
| Slew bearing bolt torque check | annually |
| Proof load / load test | per class survey cycle, commonly every 4-5 years |
| Grease points (slew bearing, pins, sheaves) | weekly to monthly depending on duty cycle |
Typical wear limits
| Wire rope discard criteria | per ISO 4309 broken-wire/diameter-reduction table for this rope construction - confirm against class table, not a fixed figure |
| Slew bearing raceway wear/backlash | manufacturer tolerance typically a few tenths of a millimetre - confirm against the manufacturer's manual |
| Sheave groove wear | flagged when the wire seats level with or below the sheave flange - confirm against the manufacturer's or class criteria |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Luffing and hoist cylinder seal kits
- Hoist wire rope of matching diameter and construction
- Slew bearing (long lead time - order well in advance)
- Main hydraulic pump/motor units
- Main hydraulic control valves
- Load cell / load pin sensors
- Sheave bearings
Safety
- Suspended load hazard if hoist wire, hook or load block fails
- Stored hydraulic energy in accumulators - depressurize before maintenance
- Crush hazard at slew ring and boom pivot points during operation
- High-pressure fluid injection injury risk from pinhole hydraulic leaks
- Work-at-height hazard on boom and structure during inspection
Class survey
Deck/offshore cranes are normally carried on the ship's register of lifting appliances under class rules: annual thorough examination, proof load test typically every 4-5 years, and periodic NDE of load-bearing pins and welds at intervals set by class. Test certificates and load test records must be kept on board and available to the surveyor.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual daily inspection per ISO 4309:2017; caliper for diameter; magnetic inductive inspection (MRI) for suspected internal damage; inspection points: drum anchorage, loading, deflection over sheaves, loaded rope sections
Visual inspection for lubricant leakage; check seals for wear and contamination; vibration and temperature monitoring; overhaul by qualified Liebherr service with specialized equipment if needed
Drucktest (Pressure Test) gegen spezifizierte Solldrücke; Sichtprüfung auf Flüssigkeitsverluste; Ölprobenanalyse (Condition Monitoring); Funktionsprüfung aller Hubfunktionen (Heben, Schwenken, Luffing)
Visual surface inspection for surface cracks and deformation; NDT inspection (X-ray/MRI) at critical hooks for internal damage; load test: ~25% above rated load capacity; inspection of hook locking and wear marks
Surface rust and corrosion by visual inspection; NDT inspection (ultrasonic, X-ray) at critical welds; dimensional check of geometric tolerances; overhaul by Service Centre Steel with welding/structural analysis if required
Visual inspection of all electrical connections for corrosion in saltwater environment; functional test of overload protection and indicators; continuity test of critical circuits; lithium battery/accumulator condition check on electro-hydraulic systems
Type-general inspection and maintenance points for this equipment category — not model-specific.
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