HLM 20-3S
Heila Cranes HLM 20-3S — Marine deck crane.
Inspector Detail
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Common issues
- Hydraulic hose or fitting leaks at the telescopic boom sections
- Wire rope wear - broken wires, corrosion or kinking on the hoist
- Hook safety latch damage or seizure
- Slew bearing or slew gear wear causing play or backlash
- Load moment/overload protection sensor drift or miscalibration
- Boom section wear pads or sliding surfaces wearing unevenly, causing binding during extension
- Structural cracking at high-stress points such as the boom root or pivot pins from cyclic loading
- Hydraulic cylinder seal leakage causing boom drift under load
Inspection checklist
- Visual inspection of boom, jib and structural welds for cracks or deformation
- Inspect wire rope for broken wires, corrosion, and correct spooling on the drum
- Check hook, hook latch and any load block for wear or deformation
- Function test all motions (luff, slew, telescope, hoist) through full range under no load
- Verify overload/load moment indicator alarm and cut-out function at test load
- Check hydraulic hoses, fittings and cylinders for leaks or chafing
- Inspect slew bearing bolts for correct torque and check for play
- Confirm pivot pins and bushings for wear where accessible
- Test emergency stop and manual lowering/descent control
- Verify the current load test/proof load certificate is valid and the load chart is displayed at the crane
Service intervals
| Function and visual inspection by a competent person | every 12 months, per class/flag lifting appliance requirement |
| Wire rope inspection | every 3-6 months, plus before use if the crane is used infrequently |
| Proof/load test | typically every 4-5 years, or per class requirement, and after any major repair |
| Hydraulic oil analysis/change | per the maker's schedule, typically every 12 months or condition-based |
| Slew bearing bolt torque check | every 12 months |
Typical wear limits
| Wire rope discard criteria | generally per ISO 4309 broken-wire and diameter-reduction criteria for the specific rope construction fitted - confirm against the maker's and class's guidance rather than a single number |
| Hook wear/deformation | commonly discarded when throat opening or section wear exceeds the maker's and class's specific limit for the hook size - do not rely on a generic percentage |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Wire rope of correct diameter, construction and length
- Hook block with latch
- Hydraulic hose assemblies for boom, luff and telescope circuits
- Hydraulic cylinder seal kits
- Load moment indicator sensor/load cell
Safety
- Overload beyond the rated capacity curve (4,100 kg at 4.79 m reducing to 1,700 kg at 10.56 m) risks structural failure or tip-over - work strictly within the load chart
- Falling load risk from worn wire rope, hook latch failure or hydraulic drift
- Crush/pinch hazards during telescope and slew operation near personnel
- Hydraulic system stored energy - depressurize and mechanically support the boom before working on cylinders or hoses
Class survey
Cargo/deck cranes are lifting appliances under class rules and typically require an annual thorough examination by a competent person, a periodic proof/load test (commonly every 4-5 years), and a valid load test certificate displayed with the crane; documented wire rope inspection history is a common survey focus.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of hydraulic oil level, color and clarity; check for water contamination and perform particle count analysis; inspect all hydraulic hoses for leaks, corrosion and wear; verify filter condition and magnetic chip accumulation indicating wear
Inspect band brake tension and lining thickness for wear; measure disk brake clearance; verify brake holding capacity under load; check for oil contamination; test emergency braking response and record measurements in maintenance logs
Visual inspection of pedestal base and deck reinforcement areas; test for corrosion pitting and rust development; perform weld integrity examination; assess dynamic load bearing capacity considering vessel motion effects; check for stress cracks
Verify wire rope certificates are current and kept in cargo gear record book; inspect rope for broken wires, rust, kinking and corrosion; verify load test certificates and thorough examination records are up-to-date per IMO MSC.1/Circ.1663
Test 360-degree rotation capability and slewing speed consistency; inspect rotation gearbox for leaks and wear; verify radio remote controls and proportional valve response; check limit switches and safety device functionality
Type-general inspection and maintenance points for this equipment category — not model-specific.
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