the primary clamping screw firmly by hand. When theclamping device is secured in place, turn the handle onthe bottom of the reaction screw. This handle swivels upand down to permit maximum movement of theclamping device side arms to ease hooking the ramcylinder into place.The hydraulic cylinder and shoe assembly (fig.3-35) are actuated by a pump. The pump applieshydraulic pressure that forces the ram with the attachedshoe down between the rim flange and tire bead. Thisaction separates the tire bead and rim.When securing the ram to the clamping device,place the ram and shoe assembly between the arms ofthe clamping device where the bracket of the cylinder issecured into the notches of the clamping device sidearms, as shown in figure 3-35.Applying pressure to the hydraulic cylinder forcesthe shoe down over the clamping device, as shown infigure 3-35. The jaws of the clamping device acts as aguide for the shoe. The convex side of the shoe bearsagainst the sidewall of the tire, forcing it inward betweenthe tire bead and rim flange, thus breaking loose the beadfrom the rim.Figure 3-36 shows how the wedges are placed oneach side of the shoe assembly to hold the bead of thetire away from the rim flange so that the shoe assemblycan be easily removed. After the shoe has been forcedbetween the tire bead and rim flange and freed from thatportion of the tire bead, the wedges are inserted to keepthe tire bead separated from the rim. Pressure is thenremoved from the hydraulic cylinder slowly. Thehydraulic cylinder and clamping device are thenremoved from the rim and the clamping device is placedapproximately 90 degrees from the wedge. This processis continued until the tire bead is completely free fromthe rim flange.Cold PatchesCold patches are used to repair punctures and smallbreaks or holes in tubes. The procedure for applying acold patch is accomplished by the following steps:Figure 3-36.—Operation of hydraulic cylinder and shoe.3-19
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