SLEEVE 0897338 - Caterpillar

Illustration 1 g01424345
Location of the brake accumulators for the service brakesThe accumulators for both the front service brakes and the rear service brakes are located behind the ladder on the right side of the machine. 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 6890 kPa (1000 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). This 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.