CAMSHAFT AS-REAR 7E6815 - Caterpillar

Illustration 1 g03578697
Service brake
Illustration 2 g03589805
View A-A
(3) Service brake oil passage
(4) Discs
(5) Plate - Separator
(8) Pin
(9) Springs (three)
Illustration 3 g03578934
Service brakes with axle housing
(1) Sun gear
(2) Piston
(3) Service brake oil passage
(4) Discs
(5) Plate - Separator
(6) Axle shaft
(7) Carrier - Planetary
(8) Pin
(9) Springs (three)
(10) Ring gearAll four service brakes are located in the axle assemblies. The service brakes are actuated by either the left or the right brake pedal. The service brakes are in both the front axle and in the rear axle.Each service brake consists of the following components: piston (2), discs (4), separator plate (5), pin (8) and springs (9).Plate (5) and piston (2) are held stationary by six pins (8). The pins are fastened in the differential housing and in the housing for the axle shaft. The piston and the plate are able to slide on the six pins, but the piston and the plate do not rotate. Springs (9) keep piston (2) in the RETRACTED position when the piston is not being used.Disc (4) has splines on the inside diameter that fit on the splines of sun gear (1). This causes disc (4) to rotate at the speed of the sun gear. Grooves are cut into the faces of disc (4). The grooves allow the passage of cooling oil between plate (5) and disc (4), and between piston (2) and disc (4).This passage will occur even when the service brakes are applied. If the groove depths in disc (4) are within specifications, cooling oil will constantly flow between disc (4) and plate (5) as disc (4) rotates. If the groove depths in disc (4) are within the specifications, cooling oil will constantly flow between piston (2) and disc (4).Carrier (7) is fastened with splines to axle (6). The axle turns with the carrier. The gears in carrier (7) rotate between sun gear (1) and stationary ring gear (10).When you push a brake pedal, pressurized oil from the service brake control valve flows through oil passage (3) in the differential housing. The force of the oil behind piston (2) moves the piston against the force of springs (9).The force of the oil also pushes disc (4) against plate (5). This causes friction between disc (4) and piston (2), and between disc (4) and plate (5). The friction slows down the following components: sun gear (1), axle (6), carrier (7) and the wheels. The machine can then be brought to a complete stop.The heat that is created from the friction of the service brakes is removed by the oil that is in the axle housings.When the brake pedal is released, the oil behind piston (2) flows through oil passage (3). This oil flows to the service brake control valve. The oil then returns to the hydraulic oil tank. With no oil pressure behind piston (2), springs (9) move the piston to the RETRACTED position and the service brakes are released.The service brakes can be actuated by either the left brake pedal or by the right brake pedal. When the transmission