M460/3S (Offshore Telescopic)
Sormec M460/3S (Offshore Telescopic) — Offshore Platform Crane.
Inspector Detail
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Common issues
- Slew bearing wear causing increased play and abnormal noise during slewing
- Hydraulic cylinder seal leakage on luffing, telescoping, or slewing cylinders
- Wire rope wear, kinking, or broken wires on the hoist rope
- Load moment indicator (LMI) sensor drift causing incorrect safe working load display
- Telescoping section wear pads wearing unevenly, causing boom sections to bind or rattle
- Hydraulic hose chafing/abrasion at boom pivot points
- Slew gearbox oil contamination or low oil level
- Corrosion at pedestal base and boom foot pin connections from offshore exposure
Inspection checklist
- Visual inspection of hoist wire rope for broken wires, corrosion, and diameter reduction
- Check all pins, bushes and pivot points for wear and adequate lubrication
- Function-test all motions (hoist, luff, slew, telescope) through full range
- Check hydraulic system for external leaks at cylinders, hoses, and fittings
- Test load moment indicator/overload protection against a known test load where required
- Inspect slew bearing bolts for correct torque and check for bearing play
- Check boom telescoping wear pads/shoes for wear and adjustment
- Inspect structural welds on boom sections and pedestal for cracks
- Check limit switches (hoist up/down, luff angle, slew) for correct operation
- Review crane logbook and load test/certification records
Service intervals
| Wire rope inspection | every 3 months by a competent person, plus daily operator visual check |
| Hydraulic oil sampling/analysis | every 6-12 months |
| Slew bearing bolt torque check | annually |
| Load test/thorough examination | annually or per flag state/class requirement |
| Grease points (pins, bushes) | weekly to monthly depending on maker schedule and duty |
| LMI calibration check | annually or after any overload event |
Typical wear limits
| Hoist wire rope discard criteria | per ISO 4309 - broken wire counts and diameter reduction thresholds depend on rope construction; do not exceed the applicable discard criteria for the fitted rope type |
| Slew bearing raceway play | compare against the maker's original acceptance clearance; a marked increase over commissioning values indicates wear - confirm the actual limit with Sormec documentation |
| Boom telescoping wear pad clearance | typically adjusted to a small clearance per maker instructions - excessive clearance shows as boom rattle/knock and should be corrected per maker procedure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Hoist wire rope (correct diameter and construction)
- Hydraulic cylinder seal kits (hoist, luff, telescope)
- Slew bearing (long lead item - condition monitor closely)
- Limit switches
- Load pin/load cell for the LMI system
- Hydraulic filter elements
Safety
- Never work under a suspended load or within the crane's slew radius during operation
- Overload protection/LMI must be functional before any lift - do not bypass
- Hydraulic accumulators remain pressurised even with pumps stopped - isolate and vent before servicing
- A failed wire rope under load can whip - keep clear of the load path
- Secure the boom in its stowed position before heavy weather
Class survey
Typically subject to annual thorough examination/load test by a competent person and periodic class/flag verification of lifting appliance certification; load test certificates, LMI test records and wire rope inspection records are standard items requested at survey.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect all hydraulic lines, fittings, and seals for leaks, corrosion, and salt spray damage (marine environments). Check accumulator pressure and condition. Verify marine coating protection on hydraulic components per DIN 15018 H2/B3 or API 2C standards.
Examine wire rope for corrosion, broken strands, and fatigue. For constant-tension systems, verify CT winch operation. For AHC systems, validate heave compensation sensor calibration. Test shock absorbers on davit cranes (FRB Series). Check slewing ring unit bearings for wear and lubrication.
For stiff-boom cranes (SA/M1500/SA): inspect welds, gussets, and fatigue cracks on boom sections. For knuckle-boom cranes (EL, M1500/EL): verify pin joint torque, articulation smoothness, and bearing wear. For foldable cranes (FB): test fold mechanism hydraulics and locking pins.
Verify current certification from IACS members (ABS, LRS, GL, DNV, RINA, BV, CCS, RMRS). For rescue davits (RB/FRB Series), confirm IMO/SOLAS code compliance. Validate that AOPS/MOPS systems function properly and that wind speed indicators operate. Test slack rope detection systems.
For polar and arctic-rated cranes (M2000/EL, Polar Ship Crane, -40°C models): inspect materials for brittle fracture risk at low temperatures. Test hydraulic fluid viscosity and gearbox oil. Verify electrical equipment (IP 56 standard) for moisture ingress. Check paint coating integrity for proper marine/arctic protection.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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