SEAL 1666656 - Caterpillar

Table 1
Required Tools    
Part Number     Description    
185-5784     Brake Wear Gauge    
Personal injury or death can result if two persons are not used in the following procedure.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Use this procedure in order to inspect the wear on the discs for the service brakes. This procedure can also be used to estimate the remaining service life of the brake discs.Each individual service brake uses an indicator pin to help determine the amount of wear on an existing service brake disc. An indicator pin is located on each side of the front and rear axle housings.
Illustration 1 g01422229
End view of axle housing for the service brakes
Illustration 2 g01422274
Section A-A (1) Cap (2) Plug (3) Sleeve (4) Indicator pin (5) Tip (6) Axle Housing (7) PistonNote: The following steps require accumulator pressure for the service brakes.
Start the engine. Run the engine until the brake accumulators reach the cutout pressure (less than 30 seconds).
Stop the engine. Engage the parking brake.
Thoroughly clean the area around cap (1) for the brake wear indicator (1) and plug (2) .
Remove cap (1) .Note: Check the friction material on the brake for wear by performing Steps 5 through 8.
Apply the service brake.
Push indicator pin (4) until contact is made with the brake piston.
Inspect wear indicator pin (4) . If the base of tip (5) protrudes past sleeve (3) the worn brake components must be replaced.
Repeat Steps 3 through 7 for the other service brakes.Note: If you install a new brake disc in any of the four service brakes, you must follow the adjustment procedure. Repeat Steps 9 through 12.
Prior to doing the next steps, sleeve (3) needs to be reset by pulling the sleeve out slightly.
Apply the service brake.
Push indicator pin (4) until contact is made with the brake piston.
Press sleeve (3) into the fitting body until the sleeve is flush with the end of wear indicator pin (4) .
Illustration 3 g00110142
Oil groove depth of the brake discsNote: The oil groove depth is the most critical dimension. If the depth of the oil grooves on the brake disc is too shallow, oil flow will be inadequate. This can cause excessive wear and abrasion.
To provide an estimate on the amount of service life for a brake disc, refer to Table 2. If the brake disc is removed from the housing, use the tool in Table 1 to measure the brake disc.
Table 2
Disc Thickness Wear Chart    
Estimated Percentage of Remaining Brake Disc Life     The Amount of Friction Material That has Worn From the Disc     Oil Groove Depth (1)    
100     0.00