CYL AS-HYD-YM 3948216 - Caterpillar

Both brakes can simultaneously be held in the "ON" position by pawl (7) on the brake linkage. This is done when the pedal is depressed.The mechanical linkage moves piston (3) when the brake pedal is pushed toward the front of the machine in the hydraulic control mechanism. Piston (3) is pushed against the roller that is on bellcrank (4). The bellcrank turns on shaft (2). The bellcrank moves link (1) toward the top. This moves pin (14) toward the top and pin (8) and pin (9) away from each other. The lever (10) and lever (11) turn shaft (12) and shaft (16). Lever (10) and lever (11) moves strut (13) and strut (15) toward each other. As the struts move toward each other, the struts push on the ends of the brake band. This causes the brake band to make contact with the steering clutch drum. The movement of the machine stops or the machine slows at this point.When the brake pedal is released, spring (5) moves the mechanical linkage and the brake pedal. The springs that are inside the hydraulic control mechanism also move the mechanical linkage and the brake pedal. The struts move away from each other. The brake band is not in contact with the steering clutch drum. Now, the brakes are in the "OFF" position.The brake can be held in the "ON" position. Push the brake pedal toward the front of the machine. At the same time, push down the parking brake. The parking brake lever is on the left side of the operator compartment. The movement of the lever moves rod (6). The movement of the lever engages the teeth of the pawl (7) with the teeth of the ratchet. The brakes are held in the "ON" position by the link. The links push bellcrank (4). In order to release the brakes, push on the brake pedal and pull up on the parking brake lever.An oil line sends oil to each brake band. This oil is used for lubrication and for cooling the brake bands.Hydraulic Control Mechanism
Pressure oil is sent to each hydraulic control mechanism. This oil comes from the control valve for the steering clutches. Oil travels into the housing. Oil fills chamber (5). When the brakes are in the "OFF" position, the oil is kept in chamber (5) .When the brake pedal is pushed forward, lever (12) pushes plunger (2) and valve (6) to the right against piston (9). This closes passage (7) in the piston. The movement of plunger (2) and valve (6) opens passage (10), passage (14), and passage (15). Oil flows from chamber (5) through passage (10). This opens plunger (13). The oil flows through plunger (2) to the center of valve (6). The oil flows through the holes in valve (6) and out passage (15). The oil flows through passage (15) and passage (14). The oil starts to fill the chamber. When the pressure of the oil in chamber (16) increases, piston (9) will move to the