HARNESS AS-SENSOR 3568374 - Caterpillar

Illustration 1 g00280426
Wheel brake components
(1) Wheel assembly
(2) Duo-Cone seals
(3) Anchor
(4) Hub
(5) Housing
(6) Ring
Illustration 2 g00801967
Front service and parking brake
Purge valves and connections
(A) Purge valve for the service brake and retarder
(B) Parking and secondary brake oil passage
(C) Service brake and retarder oil passage
(D) Brake cooling oil inlet passage
(E) Brake cooling oil outlet passage
Illustration 3 g00280428
Section A-A
Front service and parking brake
(4) Hub
(7) Parking and secondary brake release oil chamber
(8) Parking and secondary brake piston
(9) Discs
(10) Plates
(11) Service brake and retarder piston
(12) Service brake and retarder oil chamber
(13) Parking and secondary brake spring
(14) Parking and secondary brake spring
Illustration 4 g00280429
Section B-B
(15) Guide
(16) Spring Wheel assembly (1) is connected to housing (5) by two taper roller bearings. Housing (5) does not turn. Parking Brake Application
The parking brakes are spring applied brakes that are released by pressure. When the parking and secondary brake valve is not supplied with air pressure, parking and secondary brake springs (14) push on parking and secondary piston (8). Parking and secondary piston (8) is against service and retarder piston (11). Service brake and retarder piston (11) will push discs (9) and plates (10) together. Plates (10) do not turn. Discs (9) turn with wheel assembly (1). When discs (9) and plates (10) are held together, friction occurs. The friction causes the rotation of the wheel assembly to slow and the wheel assembly stops rotating. Wheel assembly (1) is connected to hub (4) by splines.When the parking and secondary brake valve is supplied with air pressure, pressure oil from the parking brake release pump section is sent to parking and secondary brake oil passage (B). Oil passage (B) is connected to parking and secondary brake release oil chamber (7). The pressure oil forces parking and secondary brake piston (8) away from discs (9) and plates (10). Spring (16) and guide (15) pull service brake and retarder piston (11) away from discs (9) and from plates (10). The discs and the plates will not be in contact and the parking and secondary brakes will be released.Service Brake Application
When the service brake or the retarder is applied, oil pressure from the air/hydraulic cylinders is sent through the slack adjuster to the service brake and retarder oil passage (C).Passage (C) is connected to the service brake and retarder oil chamber (12). As the oil pressure increases, the service brake and retarder piston (11) pushes discs (9) and plates (10) together and friction occurs. The friction causes the rotation of wheel assembly (1) to slow. A continued application of the service brake or the retarder stops the rotation of wheel assembly (1). When the service brakes are released, the return springs will push back service brake and retarder piston (11). The service brake and retarder piston will push oil back into the slack adjuster.Brake cooling oil flows in passage (D) and the brake cooling oil cools the discs and the plates. The cooling oil flows out of brake cooling oil outlet passage (E). The cooling oil returns to the hydraulic oil tank.Use purge valve (A) to remove