TRANSMISSION

Figure 3-3. Circumferential Tread Channeling

Figure 3-4. Disc Wheel Tightening Sequence

TM-5-3820-256-24-3 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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b. Erosion Wear has also been called rolling wear, channel or river wear and can be found in both bias or radial tires. Erosion wear is found more often at free rolling tires. This is an indication that the tire is used in a slow wearing operation. What happens is that the belt plies are held very rigid and the tread is not allowed to distort as it passes through the contact area. Wear will only occur at the edge of the tread. The tire is not being worn fast enough through normal driving. No corrective action required. If erosion gets to be 1/16 inch (1.588 mm) or more, the tire should be rotated to a drive axle. c. Shoulder Wear even with tires inflated properly is a normal wear of certain radial tire designs. If both inside and outside shoulders are wearing evenly around the tire, no further action is required. Do not over inflate tire to correct this effect. To do so could lead to premature failure when impact of road hazard is encountered. 3-18 TRANSMISSION 3-18.1 Check fluid level and shift linkage for proper operation. IMPORTANT - If vehicle is equipped with an automatic transmission, have a qualified mechanic occasionally check operation of starter safety switch. 3-19 WHEELS 3-19.1 General 3-19.1.1 Wheel bearings should be inspected, lubricated and adjusted at regular intervals. This is especially important if operating in deep sand, mud, or water. Refer to lubrication section of this manual, Chapter 4. 3-19.2 Installation, Tightening and Alignment a. When installing wheels, be certain that the threads on studs and nuts are clean to permit correct torquing of nuts. The mounting surfaces of rims, wheels, spacer rings and clamps must be free of dirt, rust or damage. b. Use a wire brush to clean mounting contact surfaces. Do not use lubricant on threads. c. After rim or wheel has been properly torqued, it should be checked for alignment. Rotate the wheel with a piece of chalk attached to a steady, firm surface and placed to just barely clear outside surface of tire bead seat. This procedure will point out the high spot. Keep in mind, however, that a high spot does not necessarily mean that lug nuts have been unevenly tightened. This condition or misalignment could be caused by a bent wheel. 3-16

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