TOOL G-SLEEVE 6V4141 - Caterpillar

Illustration 1 g00724870
Location of the front air/hydraulic cylinder
Illustration 2 g00648951
Components for front brake master cylinder (1) Port for oil to brake pistons (2) Purge orifice (3) Passage (4) Power piston (5) Valve (6) Hydraulic tank port (7) Rod (8) Spring (9) Air Chamber (10) Piston (11) Air supply port
Illustration 3 g00648952
Components for front brake master cylinder with cooled front brakes (if equipped) (1) Port for oil to brake pistons (2) Purge orifice (3) Passage (4) Power piston (5) Valve (6) Hydraulic tank port (7) Rod (8) Spring (9) Air Chamber (10) Piston (11) Air supply port
Illustration 4 g00724875
Location of the rear air/hydraulic cylinder
Illustration 5 g00648953
Components for rear brake master cylinder (1) Port for oil to brake pistons (2) Purge orifice (3) Passage (4) Power piston (5) Valve (6) Port for makeup oil (7) Rod (8) Spring (9) Air Chamber (10) PistonThe brake air over hydraulic cylinders (brake master cylinders) are a main component of the braking system. There is one rear brake master cylinder and one front brake master cylinder. All brake master cylinders are used for the standard application of the brakes. The same brake master cylinders are used for extended braking. All of the brake master cylinders operate the same way.When the brake pedal is used or when the retarder is used, the brake air relay valve delivers air to air chamber (9). The pressurized air pushes piston (10) and rod (7). This compresses spring (8). Rod (7) moves valve (5) in order to close passage (3). As power piston (4) moves down, oil in the brake master cylinder flows out of port (1) to the slack adjusters. The oil moves the pistons in the slack adjusters.When you stop applying the brakes, the brake air relay valve will prevent air from entering air chamber (9). In the absence of the air pressure, spring (8) pushes up piston (10) and rod (7). As rod (7) moves up, valve (5) will also move up. This opens passage (3). Valve (5) and power piston (4) will move up.Any air that is below power piston (4) flows through passage (3) and through port (6). If any oil is needed below power piston (4), oil from the hydraulic tank flows through port (6). This oil flows around valve (5) and through passage (3). This prevents a vacuum lock below power piston (4) . Purge orifice (2) is not needed in this application.Note: The brake oil pressure is approximately 6.6 times the amount of air pressure.