Rubber-Tired Gantry (RTG) Crane Maintenance and Repair Guide
When purchasing new RTG cranes directly from original equipment manufacturers (OEMs), terminal operators typically receive comprehensive operation manuals, inspection guidelines, maintenance protocols, and repair procedures, along with direct on-site technical training from OEM specialists.
However, when ports or logistics enterprises acquire pre-owned cranes or transfer equipment from other facilities, they frequently face incomplete technical documentation or inadequate handover training from the previous operator.
To ensure smooth, safe, and highly efficient container yard operations, engineering teams and equipment operators must strictly adhere to standardized daily inspection and periodic maintenance protocols. Below is a comprehensive daily checklist and maintenance guide for RTG cranes:
| Inspection Item | Inspection Method | Criteria & Corrective Action | Frequency |
| Engine & Generator System | |||
| Fuel, coolant, engine oil leakage | Visual inspection | Ensure zero leakage. Top up or replace fluids if necessary. Identify root causes of overheating. | Pre-shift / Daily |
| Engine oil level | Visual inspection via dipstick | Maintain oil level within designated upper and lower gauge marks. | Daily |
| Engine air intake & filter system | Visual & differential indicator check | Inspect dust bowl and filter restriction indicator. Clean or replace element when contaminated. | Daily |
| Air intake piping integrity | Visual & acoustic inspection | Listen for abnormal whistling or intake suction noises. Technician must monitor engine acoustic profile. | Daily |
| Engine hood, enclosure & access doors | Visual inspection | Verify all latches and locks are securely fastened. | Daily |
| Coolant expansion tank level | Visual inspection | Top up with OEM-specified coolant mix if low. | Daily |
| Auxiliary fuel tank level | Visual / Gauge check | Refuel if below operating threshold. | Daily |
| Oil cooler & radiator condition | Visual check & infrared thermometer | Inspect every 250 operating hours or daily where feasible. Clear debris and clean cooling fins. | 250 hrs / Daily |
| Drive & Transmission System | |||
| Gearbox and drive oil leakage | Visual inspection | Check seals, gaskets, and drain plugs for weeping or leaks. | Daily |
| Braking System | |||
| Main hoist brake operation | Visual & operational test | Verify brake response, pad wear, and disc clearance immediately after gantry/hoist motion. | Pre-shift |
| Emergency hoist brake hydraulic fluid | Visual inspection | Replace hydraulic fluid immediately if water contamination, emulsification, or particulate matter is detected. | Weekly / Periodic |
| Gantry Travel & Steering System | |||
| Tire wear & tread condition | Visual inspection | Check for uneven wear, cuts, embedded debris, or sidewall bulges. | Daily |
| Steering hydraulic system leakage | Visual inspection | Inspect cylinders, hoses, fittings, and steering swivels for leaks. | Daily |
| Tire inflation pressure | Pressure gauge / Visual check | Measure cold tire pressure against OEM standards across all wheels (Reference: ~10 bar for 8-wheel RTG; ~9 bar for 16-wheel RTG). | Weekly / Daily |
| Wheel lug nut tightening torque | Visual & torque check | Inspect and torque wheel mounting nuts to manufacturer specifications. | Periodic |
| Hoisting & Trolley Travel Systems | |||
| Hydraulic oil level & leak status | Visual inspection | Replenish or replace lubricants as specified. Investigate thermal spikes immediately. Assess leakage severity and execute corrective sealing. | Daily |
| Trolley travel gearbox oil level & leaks | Visual inspection | Daily | |
| Trolley drive oil operating temperature | Visual & infrared thermometer | Daily | |
| Main hoist gearbox oil level & leaks | Visual inspection | Daily | |
| Main hoist oil operating temperature | Visual & infrared thermometer | Daily | |
| Hoist mechanism acoustic signature | Acoustic / Vibration check | Identify abnormal whining, gear meshing noise, or excessive vibration. | Daily |
| Wire rope wear, broken wires & deformation | Visual & caliper inspection | Replace wire rope immediately if discard criteria (ISO 4309) are reached, operational duty cycle is met, or structural defects appear. | Daily / Weekly |
| Container Spreader | |||
| Spreader proximity sensors & limit switches | Visual & functional test | Clean optic/inductive sensors. Conduct meticulous inspection during rainy and high-humidity seasons. | Daily |
| Spreader telescoping chain tension | Visual & mechanical check | Check chain tension and lubrication every 300 operating hours or during daily pre-checks. | 300 hrs / Daily |
| Twistlock operation & interlocks | Visual & functional test | Verify smooth locking/unlocking action daily or every 100 operating hours. | 100 hrs / Daily |
| Spreader hydraulic oil level & leaks | Visual inspection | Top up hydraulic oil if low. Identify source of excessive heat or pressure drops. | Daily |
| Spreader hydraulic oil temperature | Visual & infrared thermometer | Daily | |
| Gantry Structure, Operator Cabin & Electrical Accessories | |||
| Warning lights, beacon & alarm siren | Visual & functional test | Ensure all acoustic alarms, flashing strobes, and travel horns operate reliably. | Pre-shift |
| Cabin windows, wipers & ergonomics | Visual inspection | Ensure clear panoramic visibility, operational wipers, and working climate control. | Daily |
| Cable reel drive oil level & seals | Visual inspection | Top up lubricant and replace worn seals as required. | Weekly |
| Optical & radar sensor cleanliness | Visual inspection | Wipe sensor lenses clean; carry out thorough checks during tropical monsoon downpours. | Daily |
| Cable reel mechanism operating noise | Acoustic check | Detect unusual grinding or tensioning noise in the motorized cable drum. | Daily |
| Structural steelwork, welds & corrosion | Visual & NDT inspection | Inspect load-bearing weld seams, primer coatings, paint blistering, and marine oxidation/rust. | Periodic / Monthly |
Note: The above table outlines basic daily and routine inspection tasks for RTG cranes. For advanced maintenance, major structural overhauls, and electrical revamping, terminal operators must engage certified marine engineers and experienced crane specialists to ensure comprehensive safety for port personnel and terminal assets.
Reference links: Cargotec; Konecranes
Recommended articles: What is an RTG Crane?; Professional RTG & STS Crane Maintenance Services in Vietnam; Advanced RTG Crane Maintenance Methodologies
