AIR CONDITIONER ARRANGEMENT 6P2621 - Caterpillar

Illustration 1 g01254448
(1) Inspection plug
Thoroughly clean the area around inspection plug (1) of the wheel brake assembly. Remove plug (1) from the inspection port.
Illustration 2 g01254447
New wheel brake assembly (2) Guide (3) Spring (4) Parking brake piston (5) Service brake piston (6) Brake discs (7) Plates
Check the position of guide (2) in the brake inspection port. If the head of guide (2) is positioned towards the differential side of the inspection port, wheel brake disc wear is within tolerance. Illustration 2 shows the position of guide (2) for a new brake assembly.
Illustration 3 g03355983
Guide at 25% wear (2) Guide
Illustration 4 g03355984
Guide at 50% wear (2) Guide
Illustration 5 g03355985
Guide at 75% wear (2) Guide
Refer to Illustration 3 for an indication of 25% wear. Refer to Illustration 4 for an indication of 50% wear. Refer to Illustration 5 for an indication of 75% wear.
Illustration 6 g03355992
Worn wheel brake assembly (2) Guide (3) Spring (4) Parking brake piston (5) Service brake piston (6) Brake discs (7) Plates
If the head of the guide (2) is positioned in the center or towards the wheel side of the inspection port, replace the brake discs. Illustration 6 shows the position of guide (2) for a worn wheel brake assembly.
Install plug (1) in the brake inspection port.
Repeat Steps 4 through 8 for the remaining wheel brake assemblies on the machine.Procedure with Brake Group Disassembled
If the wheel brake groups have been disassembled, use the following information to calculate the wear on the brake discs. The information will determine whether the discs require replacement.
Illustration 7 g01254449
Wheel brake assembly (C) Thickness of a disc (4) Parking brake piston (5) Service brake piston (6) Brake discs (7) Plates
Check each brake disc (6) in each wheel brake assembly. The thickness (C) of a new disc is 7.10 0.13 mm (0.280 0.005 inch). The minimum thickness of a worn disc should not exceed 5.70 mm (0.224 inch). Service the brake before discs (6) reach the minimum thickness.Note: Groove depth is the most critical dimension. If the depth of the grooves on the brake discs is too shallow, oil flow to the wheel brakes will be inadequate.
Illustration 8 g01254450
Measuring the depth of the grooves on the wheel brake discs
Check the groove depth on both sides of the brake disc. Use a depth gauge for this procedure. Check all brake discs in each wheel brake assembly.
The depth of the oil grooves must be greater than 0.46 mm (0.018 inch)
Table 1
Disc Thickness Wear Chart    
Estimated Percentage of Remaining Brake Disc Life     Brake Disc Thickness     Oil Groove Depth (1)    
100    
7.10 mm (0.280 inch)    
1.05 mm (0.041 inch)    
80    
6.82 mm (0.268 inch)    
0.93 mm (0.036 inch)    
60    
6.54 mm (0.257 inch)    
0.81 mm (0.031 inch)    
40    
6.26 mm (0.246 inch)    
0.70 mm (0.027 inch)    
20    
5.98 mm (0.235 inch)    
0.58 mm (0.022 inch)    
0    
5.70 mm (0.224 inch)    
0.46 mm (0.018 inch)     (1) Groove depth is the most