What information is required when inquiring about drive wheels for rubber-tired cranes?

To enable the manufacturer to provide a quick, accurate quote and a suitable solution, please provide the following eight categories of key information upfront to avoid back-and-forth communication:

I. Basic Equipment Information (Determine tonnage and operating environment first)
Machine Tonnage: Rated lifting capacity of the rubber-tired crane (e.g., 80 tons, 100 tons)
Deadweight and Load Distribution: Total equipment weight, number of drive wheels, load per wheel (or total load ÷ number of drive wheels)
Application Scenario: Port yard, factory transfer, mining site, etc.; presence of special conditions such as salt spray, dust, or high temperatures
Operating Conditions:
Travel speed (fully loaded / unloaded; e.g., 0–25 m/min)
Maximum gradeability (e.g., 5% / 8%)
Daily operating duration and start-stop frequency
II. Core Drive Wheel Parameters (Determines model selection)
Load Requirements per Wheel:
Rated load per wheel (e.g., 25 tons/wheel)
Safety factor requirements (e.g., 1.25x or 1.5x overload capacity)
Tire Specifications and Material:
Tire model (e.g., 28×9-15, 31×10-16, or rim diameter)
Tire type: Solid rubber / Polyurethane / Pneumatic
Tread pattern: Deep block / Straight rib / Anti-slip
Special requirements: Oil resistance / Temperature resistance / Anti-static / Explosion-proof
Power and Transmission Parameters:
Drive method: Independent single-wheel drive / Coaxial drive
Motor type: Servo motor / Variable frequency motor / Explosion-proof motor
Motor power, voltage (e.g., 380V/480V), protection rating (e.g., IP54/IP55)
Reducer type: Planetary reducer / Helical gear reducer; gear ratio range
Braking requirements: Electromagnetic brake / Hydraulic brake; requirement for dual braking
III. Installation and Interface Dimensions (Ensure compatibility)
Installation method: Suspended / Vertical / Horizontal type (refer to the integrated structure shown in your diagram)
Key dimensions:
Rim diameter, tire outer diameter
Axle diameter, keyway specifications
Mounting hole spacing, shaft center height
Steering angle limits (e.g., ±90°)
System interfaces: Compatibility requirements for steering mechanisms and suspension/shock-absorption systems
IV. Performance and service life requirements (Quality grade specification)
Positioning accuracy: Precision docking requirements (e.g., ±5mm repeatability)
Braking distance: Maximum braking distance requirement at full load
Design life: Expected service life of tire/gearbox/motor (e.g., tire: 3 years / 5000 hours)
Certification requirements: CE/CCS/ISO certifications, or specific standards for the destination country
V. Procurement and delivery information (Commercial terms)
Procurement quantity: Number of drive wheels per unit (e.g., 4 wheels/unit)
Delivery lead time: Desired delivery date
Packaging and shipping: Export-grade packaging requirements, specified shipping method
After-sales requirements: Warranty period, on-site installation/training needs
✅ Inquiry template ：
Hello, we would like to purchase drive wheels for a rubber-tired gantry (RTG) crane. Our requirements are as follows:
Equipment: 80-ton RTG crane; total deadweight 60 tons; 4 drive wheel sets; load per wheel approx. 25 tons; operating in a port yard (salt spray environment)
Operating conditions: Full-load speed 20m/min; 5% gradeability; 8 hours of daily operation
Drive wheel requirements:
Rated load per wheel ≥ 30 tons; safety factor 1.3
Solid rubber tire; deep block tread pattern; sidewall thickness ≥ 30mm
Integrated servo motor + planetary gearbox; motor power 4kW/380V; IP55 protection rating; equipped with electromagnetic brake
Mounting interface: Vertical suspension; axle diameter Φ60mm; mounting hole spacing 200×200mm
Quantity: 4 sets; CCS certification required; delivery lead time 30 days
Please provide a quotation and technical proposal based on the above information. Thank you!

💡 Tips to Avoid Pitfalls
Don't just specify "tonnage": For an 80-ton rubber-tired crane, variations in load distribution can lead to significant differences in drive wheel specifications.
Clarify certification requirements upfront: Specify export orders during the inquiry stage to avoid additional costs for plan modifications later on.
Build in a safety margin: Allow for a 10–20% buffer in parameters such as single-wheel load capacity and power output to prevent overloading caused by future changes in operating conditions.