ARM AS 3208568 - Caterpillar

Do not attempt to sand material that contains asbestos. Use the appropriate precautions for working with asbestos.
To check the lining for asbestos, clean the edge of the lining. The lining contains asbestos if the following composition is found: green stripe, yellow stripe and brass flakes. Carefully remove the linings. Dispose of the linings according to local regulations.
Use caution in order to avoid breathing dust that may be generated from handling any friction material, regardless of whether or not the material contains asbestos. If the dust is inhaled, the dust can be hazardous to you health.Wear a proper protective breathing device when handling friction material.
Inspect the surface of the friction shoes. If the linings are glazed, the glazing may be removed by lightly sanding the lining. Do not sand the lining if the lining contains asbestos. Replacing the Friction Shoes
Illustration 4 g00500491
(1) Lockwire (2) Scallop (3) Pins
Remove lockwire (1) . Discard the lockwire.
Remove pins (3) .
Remove the friction shoe from the element. Discard the friction shoe.
Illustration 5 g00504663
(4) Flange for the air tubes (5) Pinhead
Place the new friction shoe in position. Insert the pins. Ensure that pinhead (5) is located on the side with the flange for the air tubes.
To secure the friction shoe, insert lockwire (1) through the holes of two pins. Ensure that the scallop (2) points away from the friction material (Illustration 4 ). Center the lockwire so that equal lengths of wire extend from each pin. Bend the ends of the wire toward the friction material.Measuring the Diameter of the Drum
Note: Heat may cause minor checking of the drum. This may be removed by machining the outer diameter of the drum.If the drum has been exposed to excessive heat, the open end of the drum may flare outward. If this occurs, the drum may not appear to be worn. Therefore, it is important to measure the diameter of the drum.Measure the outer diameter of the drum at several locations. Compare the measurements to the information that is listed in Table 1.
Table 1
Wear Limits for the Drum    
Element (1)     Maximum Allowable Wear Limit    
4CB200 through 14CB400    
2.3 mm (.09 inch)    
16CB500 through 24CB500    
3 mm (.12 inch)    
26CB525 through 40CB525    
4.8 mm (.19 inch)    
45CB525    
6.4 mm (.25 inch)    
( 1 ) The numbers that precede "CB" represent the original diameter of the drum in inches.To calculate the minimum allowable diameter, subtract the maximum allowable wear limit from the original diameter of the drum. Table 1 is an example for using the information that is listed in Table 2.
Table 2
Example for Calculating the Minimum Allowable Diameter of the Drum    
Original Diameter of Element 10CB300    
254 mm (10 inch)    
Subtract the maximum allowable wear limit.    
2.3 mm (.09 inch)    
The difference is the minimum allowable diameter.    
251.7 mm (9.91 inch)    For the example in Table 2, replace the drum if the diameter is less than 251.7 mm