Comprehensive Guide Practical Steps for Tire Dismantling and Installation in Hazardous Material Transportation

In the hazardous materials transportation industry, proper tire mounting and dismounting procedures are critical for ensuring safety and operational efficiency. Understanding correct tire handling methods not only prevents accidents and reduces wheel wear but also enhances overall productivity. Below we detail the step-by-step processes for commercial vehicle tire servicing.

I. Commercial Vehicle Tire Dismounting Procedure

Tire dismounting typically involves two main types: tube-type and tubeless tires. The process begins with thorough cleaning to facilitate safe removal and prevent contaminants from causing internal damage during service.

1. Surface Preparation: Clean all tire surfaces, wheel-to-rim contact areas, bolts, and nuts using appropriate tools to remove rust, debris, and dirt deposits.
2. Hardware Lubrication: Apply suitable lubricant to bolt threads and nut grooves before disassembly to reduce wear. Use a torque wrench and follow crisscross pattern when loosening nuts to minimize component fatigue.
3. Pressure Release: Lift the locking ring side to fully deflate the tire. For tube-type tires, remove the valve stem after depressurization. Mark alignment positions on both tire and rim for reassembly reference.
4. Bead Breaking: Insert straight pry bars between the rim flange and tire bead to depress the bead. Create sufficient clearance to position pry bars with ends properly anchored against the rim flange.
5. Bead Removal: Continue depressing the bead while moving straight and curved pry bars circumferentially around the rim to detach the tapered locking ring.
6. Lock Ring Extraction: Position pry bar ends into the lock ring groove, lift the ring while supporting with curved bars, then manually remove the lock ring from the rim assembly.
7. Wheel Inversion: After removing the flange ring, invert the wheel and use combination pry bars to separate the tire from the rim. Stand the assembly vertically and completely extract the rim base from the tire, using controlled hammer taps on the rim's locking section if necessary.

II. Commercial Vehicle Tire Mounting Procedure

While mounting essentially reverses the dismounting process, particular attention must be paid to component matching - especially for tube-type tires with multiple parts. Correct alignment of rim, flange, and locking ring (as marked during disassembly) is crucial to prevent high-speed failures and maintain road safety.

1. Tube Preparation: Dust the inner tube with talcum powder before installing it with the rim strip inside the casing. Partially inflate to seat components and secure the valve assembly.
2. Tire Positioning: Angle the tire onto the rim with the valve stem perpendicular to its slot. Begin seating the bead from the valve side, working progressively around the circumference.
3. Flange Installation: Mount the flange ring by first engaging one end into its groove before pressing the opposite end into position.
4. Final Verification: Confirm the locking ring edge properly seats beneath the tire bead. Inflate to 49 kPa (7 psi) for initial seating verification before pressurizing to specified operating levels.