CONTROL GP-STEERING 1073898 - Caterpillar

Illustration 1 g03418055
Location of Accumulators (1) Accumulator for rear service brakes. (2) Accumulator for front service brakes.The two brake accumulators are located on the right side of the machine. The accumulators are positioned next to the hydraulic tank.
Illustration 2 g00466029
Components of Brake Accumulator (3) Outlet to the service brake control valve. (4) Pressure oil chamber. (5) Accumulator. (6) Piston. (7) Chamber for nitrogen gas. (8) Nitrogen charging valve. Each accumulator has a sealed piston (6). The piston moves back and forth inside the bore of each accumulator. The chamber for the nitrogen gas (7) is located below the piston (6). The dry nitrogen gas is put into the accumulator (5) through nitrogen charging valve (8). The chamber of dry nitrogen gas needs a charge of approximately 5520 kPa (800 psi).Oil from the accumulator charging valve flows in through port (3). The oil then enters the pressure oil chamber (4). The oil pushes piston (6) which causes the dry nitrogen gas to compress. When pressure in the accumulator reaches 14485 345 kPa (2100 50 psi), the accumulator charging valve stops the flow of oil.When the operator pushes down on either brake pedal, the oil from chamber (4) flows out of port (3). The oil flows from port (3) through the service brake control valve in order to apply the service brakes.