Figure 11 - Checking for Out-of-Square Lining

Figure 8 - Reconditioning Drum on Brake Drum Lathe

igure 14 - Sequence In Securing Brake Lining to Shoe

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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RECONDITIONING BRAKE DRUMS AND SHOES Check brake lining for possible out-of-square condition which would indicate a distorted shoe and/or bent backing plate, Figure 11. Rusted shoe support pads suggest possible distortion. A loose or bent backing plate may cause unbalanced braking and/or noise. Check backing plate for distortion by placing a straightedge across its flat. Check for galled or loose anchor pins. When removing worn lining from shoes, drill out old rivets if possible to prevent distorting shoe table. After the old linings are removed from the shoes, the shoes should be cleaned and buffed to remove all dirt and grease. Grease is one of the greatest deteriorating agents of lining. Discard used lock washers after removing lining bolts. Use new washers when installing new lining. Replace bolts and nuts if signs of distortion or wear are present. Do not handle new brake linings or relined shoes with greasy hands or allow linings to come in contact with mineral oil or grease. Care should be used in selecting the correct thickness of lining for each brake shoe and drum. Usually the standard thickness will be used. If the drum has been turned or has become worn, increasing the diameter, oversize lining may be required. Figure 11 - Checking for Out-of-Square Lining If it is not known how much material has been removed from the drum during the turning operation, the following simple test may be used to help select the proper lining. Hold standard size lining snugly to the shoe, position it against the inner surface of the drum, forcing it into contact with the drum surface. The lining is now in the ’same position as during a brake application. If space is noted at the ends of the shoe (shoe can be rocked), an oversize lining is required (Figure 12). If lining selected is too thick, only the ends of the lining will contact the drum. Refer to Figure 13. Figure 12 - Space at End of Shoe Lining Selected Too Thin Figure 13 - Space at Center of Shoe And Lining Contacting Ends, Lining Selected Too Thick The lining must be installed on the shoe so that it fits smoothly and evenly, contacting the shoe throughout the entire radius. If gaps occur between the rivets, difficulty will be met in adjusting the brakes in that "spongy" or rubbery pedal may occur which makes satisfactory brake application impossible. CTS-4082B - Page 6

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