COMPONENT OPERATION / Others (Upperstructure) ACCUMULATOR The accumulator is provided in the pilot circuit in order to buffer fluctuations in oil pressure, and to maintain pilot pressure for a short time period after the engine is stopped. The accumulator mainly consists of body (5), holder (4), bladder (2), which encloses nitrogen gas (N 2 ), and poppet (1). Pressure oil from the pilot pump enters into the accumulator through port A pilot pressure com- presses bladder (2) until the nitrogen gas bal- ances against with bladder (2).
When pressure supply is stopped due to engine stall or any other reasons, bladder (2) starts ex- panding and accumulated oil is supplied to the pilot circuit through port A. 6 1 5 Nitrogen Gas (N 2 ) 2 4 Pilot Pres- sure Oil 3 T105-02-10-003 1 - Poppet 4 - Holder 2 - Bladder 5 - Body 3 - Oil Port 6 - Gas Plug A T3-7-9