Air Cargo Caster Maintenance and Load Rating Specifications

Executive Summary: Air cargo casters must withstand extreme dynamic loads, shock impacts, and environmental stressors while maintaining 360° mobility. Critical engineering parameters include load rating calculations (static + dynamic safety factors), bearing type selection (precision ball vs. roller), and fatigue-resistant wheel materials (polyurethane, forged steel). Proper maintenance intervals prevent premature failure in high-cycle airport cargo handling systems.

1. Caster Load Rating Engineering Standards

Industrial caster load capacity must account for both static weight distribution and dynamic forces during cargo movement. Use the following formula for air cargo applications:

Load per Caster Calculation

Formula: L_required = (W_equipment × SF_dynamic) / N_casters

• W_equipment = Total gross weight of loaded cargo container (lbs/kg)
• SF_dynamic = Dynamic safety factor (1.5 for smooth floors, 2.0+ for uneven surfaces)
• N_casters = Number of active casters (minimum 3 for stability)

Caster Type	Static Load Rating (lbs)	Dynamic Load Rating (lbs)	Wheel Material	AGV Suitability
Standard Caster (Dual Wheel)	2,500	1,200	Nylon	No
Heavy-Duty Industrial Caster	8,000	4,000	Forged Steel	Yes
Air Cargo Caster (Pneumatic)	6,000	3,500	Polyurethane	Yes

2. Air Cargo Caster Material Selection

2.1 Wheel Composition

• Polyurethane: 85-95 Shore A hardness for shock absorption on tarmac surfaces
• Forged Steel: Required for explosive environments (FAA Class 1 Div 1)
• Pneumatic: Only use DOT-approved tires with 50 PSI minimum ratings

2.2 Bearing Types

Select based on duty cycle (cycles/day) and contamination risk:

• Precision Ball Bearings: >10,000 cycles/day (AGV applications)
• Tapered Roller Bearings: High side-load resistance for uneven docks
• Kingpinless Designs: Eliminate pivot wear in high-turn applications

3. Maintenance Protocols for Industrial Casters

3.1 Inspection Schedule

• Daily: Check for wheel deformation, bearing noise, swivel resistance
• Weekly: Lubricate kingpins with MIL-PRF-81322 grease
• Monthly Torque verification on all fasteners (85-110 ft-lbs for M12 bolts)

3.2 Failure Mode Analysis

Common air cargo caster failures include:

• Wheel flat-spotting from abrupt braking (>0.3G deceleration)
• Bearing seizure due to FOD (foreign object debris)
• Swivel joint wear exceeding 0.5mm radial play

4. Procurement Specifications for Equipment Manufacturers

When sourcing air cargo casters, require vendors to certify:

• FAA AC 20-37E compliance for aviation ground support
• Salt spray testing per ASTM B117 (500+ hours)
• Dynamic load testing at 150% of rated capacity

Technical Note: Always specify industrial casters with 25% higher load ratings than calculated requirements to account for asymmetric loading during cargo shifts.