DRAWBAR & YOKE AS 6G1933 - Caterpillar

Illustration 1 g03597376The brake accumulators are located in the service center compartment behind the ladder on the right-hand side of the cab. The compartment door and ladder have been removed for clarity.The accumulators are mounted in a vertical position. The accumulator for the front service brakes is positioned to the outside of the accumulator for the rear service brakes.
Illustration 2 g00291611
(1) Nitrogen charging valve
(2) Chamber for the nitrogen gas
(3) Piston
(4) Pressure oil chamber.
(5) Accumulator
(6) Outlet to service brake control valveThe two accumulators for the service brakes have piston (3), which is sealed. The piston moves back and forth inside the bore of each accumulator. The chamber for nitrogen gas (2) contains a charge of approximately 4700 kPa (682 psi) of dry nitrogen gas. The dry nitrogen gas is put into the accumulator through nitrogen charging valve (1).Oil from the accumulator charging valve flows through outlet (6). The oil then enters pressure oil chamber (4). The oil then pushes piston (3). The movement of the piston causes the dry nitrogen gas to compress. When the pressure in the accumulator reaches the cutout pressure, the supply of oil is stopped by the accumulator charging valve.When a brake pedal is pushed, oil from chamber (4) flows outward through outlet (6). This oil flows to the service brake control valve and the oil then applies the service brakes.