SUPPORT 1459328 - Caterpillar

Illustration 1 g00105031
(1) Air inlet port (2) Tandem housing (3) Wheel spindle housing
Illustration 2 g01382520
(3) Wheel spindle housing (4) Sprocket (5) Shims (6) Brake hub (7) Stationary discs (8) Revolving disc (9) Air compartment (10) Wheel spindle (11) Duo-Cone seal (12) Springs (13) Air piston (14) CoverPower from the differential flows through the drive chain to sprocket (4) . Inside the wheel spindle housing (3) , the sprocket (4) turns wheel spindle (10) , brake hub (6) , and revolving discs (8) . The drive wheels are connected to wheel spindle (10) .There is one disc type brake in each wheel spindle housing (3) . The four disc type brakes are used for the service brake system. The brakes are cooled through the oil in tandem housing (2) . The service brakes are activated by air pressure from the air control valve for the service brakes. There is a Duo-Cone seal (11) that is located between the wheel spindle (10) and the wheel spindle housing (3) . The Duo-Cone seal will seal in the oil. The Duo-Cone seal will also keep out the dirt, the water, and the other contaminants.Stationary discs (7) are splined into wheel spindle housing (3) . Revolving discs (8) are splined onto brake hub (6) . The brake hub (6) is splined onto wheel spindle (10) .
Illustration 3 g00106947
Instrument Panel (15) Air pressure gauge (16) Air pressure gaugeAir from each section of the air tank flows into the respective air pressure gauge (15) and (16) on the instrument panel and to the air control valve (17) for the service brakes.
Illustration 4 g01382541
Location of Air Control Valve (Service Brake) (17) Air control valve for the service brakesWhen you depress the service brake control (pedal), a rod actuates air control valve (17) for the service brakes. Then, the air control valve for the service brakes will send part of the air pressure from the sections of the air tank to the service brakes. The position of the pedal regulates the amount of air pressure to the brakes.Air pressure flows through air inlet port (1) into air compartment (9) . Air then moves air piston (13) against stationary discs (7) and revolving discs (8) . The air piston pushes the discs against cover (14) . As the air pressure increases, air piston (13) is forced against the discs. This will cause friction between the discs. As the friction becomes greater, revolving discs (8) , brake hub (6) and wheel spindle (10) will start to slow down, since stationary discs (7) and wheel spindle housing (3) cannot turn. The brakes are in the BRAKE ON position, but the brakes are not fully engaged.If the operator continues to depress the pedal downward, the air pressure will increase in air compartment (9) . The friction between discs will then become great enough to stop revolving discs (8) , brake hub (6) and wheel spindle (10) . Air pressure is held in the brakes in order to keep the brakes in the BRAKE ON position.When