HLRM 45-5S
Heila HLRM 45-5S — Marine deck crane, articulating knuckle boom, medium-heavy lift.
Inspector Detail
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Common issues
- Slew bearing wear and grease starvation from cyclic offshore loading
- Hydraulic cylinder rod seal leakage on the boom extension and luffing cylinders under high side-load
- Knuckle joint pin and bushing wear leading to increased play at the boom elbow
- Load moment / overload protection sensor drift or calibration loss
- Hydraulic hose chafing where routed along the telescoping boom sections
- Wire rope corrosion, kinking or broken wires from offshore spray exposure (if winch fitted)
- Slew gearbox oil contamination from seawater ingress on deck-exposed units
Inspection checklist
- Visual check of boom sections for paint damage, dents and deformation
- Slew bearing bolt torque check and bearing play measurement
- Hydraulic system pressure test at rated load, proof load where due
- Cylinder rod surfaces checked for pitting, scoring and seal leakage
- Function test of load moment limiter / overload cut-out and emergency lowering
- Knuckle and telescoping pin/bushing clearance measurement
- Wire rope and sheave inspection for wear, corrosion, broken wires (if fitted)
- Slew and luffing brake holding capacity check
- Limit switches and remote control link check
- Structural NDT of highly stressed weld areas per class requirement
Service intervals
| Load test / proof load | per class requirement, typically annual to 5-yearly depending on flag/class |
| Hydraulic oil sampling | 6-12 months |
| Hydraulic oil change | typically 2,000-4,000 running hours or per manufacturer's manual |
| Slew bearing greasing | weekly to monthly depending on duty cycle |
| Wire rope inspection (if fitted) | monthly, per class survey items |
| Hydraulic filter replacement | per manufacturer's manual, typically 500-1,000 hours or annually |
Typical wear limits
| Knuckle pin/bushing clearance | typically flagged once clearance exceeds roughly 0.5-1.0 mm above as-new - confirm against the maker's manual |
| Slew bearing axial/radial play | manufacturer-specific; any measurable increase against baseline should trigger closer monitoring |
| Wire rope discard (if fitted) | per ISO 4309 broken-wire and diameter-reduction criteria |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Hydraulic cylinder seal kits (luffing, telescoping)
- Slew bearing (long lead time item)
- Main hydraulic pump / motor
- Knuckle and telescoping pins and bushings
- Boom-routed hydraulic hoses
- Overload / load moment sensor
- Wire rope and sheaves (if winch-equipped)
Safety
- Stored hydraulic pressure in accumulators and cylinders during maintenance
- Suspended or uncontrolled load if overload protection or brake fails
- Crush hazard at the knuckle joint and telescoping sections during operation
- Working at height on the boom for inspection and maintenance
- Pinch points at the slew ring and pedestal base
Class survey
Deck cranes above the applicable SWL threshold are typically subject to Lifting Appliances survey requirements - annual thorough examination plus periodic proof load test, interval per class/flag. Survey focus is on hydraulic system integrity, overload protection function tests, and structural condition of high-stress welds at the pedestal and knuckle joint. Proof load and NDT records should be kept in the ship's lifting appliance register.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection combined with ultrasonic testing (UT) and magnetic particle testing (MT) for crack detection; measure corrosion-related section loss at critical weld zones; check for fatigue cracks from cyclic vessel motions (roll, pitch, heave)
Ultrasonic thickness testing (UTT) at key locations (pedestal base, boom connections, deck mounting area); assess remaining steel thickness; identify sections with 10% or greater section loss; compare against original design specifications
Inspect hydraulic lines for cracks, corrosion, and leakage; check hydraulic fluid level and condition (contamination analysis); examine pump operation and pressure relief settings; test all hydraulic cylinders for smooth operation and load holding capability
Visual inspection of load chains for broken links, distortion, and corrosion; measure link dimensions for wear; inspect shackles, hooks, and rigging for cracks; conduct non-destructive testing (eddy current) on critical rigging components; verify compliance with applicable lifting standards
Verify current proof load test certificates (minimum bi-annual as per ISO 23415:2017); conduct dynamic load testing with test weights (minimum 5-minute suspended hang time); confirm load holding without drift; document test results against rated capacity; perform test at multiple reach positions
Type-general inspection and maintenance points for this equipment category — not model-specific.
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