Issue link: http://read.dmtmag.com/i/34501
INFLATION OF TUBELESS TIRES Re-inflation of any type of tire/rim assembly that has been operated in a run-flat or underinflated condition (less than 80% of normal recommended operating pressure) can result in serious injury or death. The tire may be damaged on the inside and can explode while you are adding air. The rim parts may be worn, damaged, or dislodged and can explosively separate. 1. Lay tire/wheel assembly horizontally and inflate to no more than 5 psi to position the beads on the flanges. OSHA dictates no more than 5 psi outside the cage to seat the beads. 4. Ensure that the guide rib (GG Ring/mold line) is positioned concentrically to the rim flange with no greater than 2⁄32" of difference found circumferentially. Check for this variation by measuring at four sidewall locations (12, 3, 6, 9 o’clock). If bead(s) did not seat, deflate tire, re-lubricate the bead seats and re-inflate. Note: As a general guide in vibration analysis, the 30/60/90 rule may apply: .030-.060 (1⁄32 to 2⁄32 inch)= No action is required. Limited possibility for vibration exists, and this range maximizes the ability to balance properly. .061-.090 (2 ⁄32 to 3⁄32 inch) = Corrective action would be to perform the 3 R’s, after deflating the tire. – Rotate the tire on the wheel – Re-lubricate the tire and wheel (ensure the wheel is very clean) – Re-inflate ensuring your initial inflation is with the tire lying horizontal (3-5 psi max) >.090 (>3⁄32 inch) = Perform 3 R’s if mismount is indicated; however, when the reading is this high, it usually requires checking runout on these component parts: wheels/hubs/drums/wheel bearings. 2. To complete the seating of the beads, place the assembly in an OSHA (Occupational Safety and Health Administration) compliant inflation restraining device (i.e. safety cage) and inflate to 20 psi. Check the assembly carefully for any signs of distortion or irregularities from run-flat. If run-flat is detected, scrap the tire. 3. If no damage is detected, continue to inflate to the maximum air pressure marked on the sidewall. RMA (Rubber Manufacturers Association) recommends that any tire suspected of having been underinflated and/or overloaded must remain in the safety cage at 20 psi over the maximum air pressure marked on the sidewall. Do not exceed the maximum inflation pressure for the wheel. RMA requires that all steel sidewall tires are inflated without a valve core. 5. After beads are properly seated, place the tire in safety cage and inflate assembly to maximum pressure rating shown on the sidewall, then reduce to operating pressure. Check valve core for leakage, then install suitable valve cap. Consider the use of inflate-thru or double seal valve caps for easier pressure maintenance. Valve Caps, Cores, and Stems Inflate-Thru Valve Caps Section Two: Mounting the Tire 27