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| Illustration 1 | g00569299 |
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View from Left Side of Machine | |
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| Illustration 2 | g00569300 |
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Accumulator charging valve (1) Pressure port (2) Accumulator port A1 (3) Accumulator port A2 | |
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| Illustration 3 | g00946752 |
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Section Views of Accumulator Charging Valve (4) Check valve (5) Pilot control valve (6) Adjusting screw (7) Inverse shuttle check valve (8) Unloader valve spring (9) Relief valve | |
The brake pump supplies hydraulic oil to the brake accumulator charging valve. The brake accumulator charging valve maintains the pressure in the accumulators at a constant range while the engine is running. The accumulator charging valve and the accumulators are located near the rear cab support.
The inverse shuttle check valve (7) allows the lowest accumulator pressure to be sensed at pilot control valve (5). If the accumulator pressure is less than the cut-in pressure, the pilot control section opens in order to allow the pressure to assist unloader valve spring (8). Additional pressure at port (1) is developed by the hydraulic assist. Pressure oil will also pass through check valve (4) and through the inverse shuttle check valve to both accumulators. Pressure will continue to rise until the accumulator pressure reaches the cut out pressure. The pilot control valve will close. The hydraulic assist will decrease and the pump pressure will decrease to the normal standby pressure. The check valve will hold the higher pressure in the accumulators. Refer to Specifications, "Accumulator Charging Valve" for your machine for information on the cut-in pressure, cut out pressure, and standby pressure.
Adjusting screw (6) is used to adjust the cut-in pressure and cut out pressure of the accumulators.
Relief valve (9) controls the inlet pressure during high pressure situations. Refer to Specifications, "Accumulator Charging Valve" for your machine for the pressure setting of the relief valve.