UNIT 0964675 - Caterpillar

Illustration 1 g01063925
Brake wear tool ports for the left side rear wheel brake assembly and the right side front wheel brake assembly (1) Plug
Illustration 2 g01063930
Brake wear tool ports for the right side rear wheel brake assembly and the left side front wheel brake assembly (1) PlugNote: Oil is likely to flow from the hole. Use a suitable container to catch the oil.
Thoroughly clean the area around plug (1) on one of the wheel brake assemblies. Remove either plug (1) from the brake housing.
Illustration 3 g01058970
Brake wear tool installed (2) 6EL5193 Brake Wear Tool
Install 6EL5193 Brake Wear Tool (2) into the inspection port of the wheel brake assembly.
Illustration 4 g01063944
New brake discs (A) 6.46 mm (0.254 inch) (3) Brake wear identification groove (4) Housing
Measure dimension (A) from groove (3) to the face of housing (4). Record this measurement. Refer to the following chart to determine the remaining service life of the brake discs.
Table 2
Brake Disc Wear Chart    
Dimension A     Estimated Percentage of Remaining Brake Disc Life    
6.4 mm (0.25 inch)     100 %    
5.1 mm (0.20 inch)     80 %    
3.8 mm (0.15 inch)     60 %    
2.5 mm (0.10 inch)     40 %    
1.2 mm (0.05 inch)     20 %    
0 mm (0 inch)     0 %    
Illustration 5 g01063954
Worn brake discs (3) Brake wear identification groove (4) Brake wear tool housing
If groove (3) is against the face of housing (4), as shown in Illustration 5, the brake discs are worn and will need replacing.
Check the O-ring seal for plug (1). If the O-ring seal is damaged, replace the O-ring.
Install plug (1) to the brake housing.
Repeat Step 2 through Step 7 for the remaining wheel brake assemblies on the machine.
Tighten the hydraulic tank filler cap.Brake Disc Wear and Plate Check
Reference: For new and worn dimensions of the brake discs and plates, refer to Specifications, RENR6914, "Service and Parking Brake".Friction Discs
Check for the thickness of the discs. Determine if friction material needs to be removed (this is material that has flaked off). Check for shallow oil grooves.
Table 3
Table for Determining the Wear of the Friction Discs    
Percentage of Disc Wear     Disc Thickness    
0 %    
5.08 mm (0.200 inch)    
10 %    
5.03 mm (0.198 inch)    
20 %    
4.98 mm (0.196 inch)    
30 %    
4.93 mm (0.194 inch)    
40 %    
4.88 mm (0.192 inch)    
50 %    
4.83 mm (0.190 inch)    
60 %    
4.78 mm (0.188 inch)    
70 %    
4.72 mm (0.186 inch)    
80 %    
4.67 mm (0.184 inch)    
90 %    
4.63 mm (0.182 inch)    
100 %    
4.57 mm (0.180 inch)    Replace the discs if any of the following conditions exist:
The remaining brake disc life does not last until the next rebuild of a major component.
The disc has more than 20 percent wear difference when compared to the other discs that are in the same assembly.
10 percent or more